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Ontario Conservation Authorities by Municipality

Updated September 17, 2026

Which conservation authority has jurisdiction over a property can affect what permits are needed before you can build, sever, or close on land near water or wetlands. This table covers 270 Ontario municipalities and counties, mapped against the province’s conservation authority boundary data.

Browse the list ↓Real Estate services

Why this list matters in a legal matter

This table shows which conservation authority has jurisdiction in each Ontario municipality or county, based on the province’s conservation authority administrative-area boundaries. Some municipalities sit inside more than one authority’s watershed, which is why a handful of rows list more than one conservation authority.

The distinction matters directly in a real estate transaction. If a property sits in or near a floodplain, wetland, or shoreline, the local conservation authority — not just the municipality — may need to issue a permit before development, fill placement, or grading can proceed, and some purchase agreements make closing conditional on confirming that permit status. Knowing which authority to contact, and having its phone number and website on hand, can save real time during a due diligence period.

Find your municipality or county below. Each entry links to the authority’s website. This table is informational only — it is not legal advice, and boundaries or contact details should be confirmed directly with the authority before relying on them for a closing.

Jump to a municipality (270)
Addington HighlandsAdelaide MetcalfeAdjala-TosorontioAjaxAlbertonAlfred and PlantagenetAlnwick/HaldimandAmaranthAmherstburgArran–ElderslieAshfield–Colborne–WawanoshAsphodel–NorwoodAthensAugustaAuroraAylmerBaldwinBarrieBayhamBeckwithBellevilleBlandford-BlenheimBluewaterBonfieldBradford West GwillimburyBramptonBrantBrantfordBrightonBrockBrocktonBrockvilleBrooke-AlvinstonBruce CountyBurlingtonCaledonCallanderCalvinCambridgeCarleton PlaceCasselmanCavan MonaghanCentral ElginCentral FrontenacCentral HuronCentre HastingsCentre WellingtonChatham-KentChatsworthChisholmClarence-RocklandClaringtonClearviewCobourgCollingwoodConmeeCornwallCramaheDawn-EuphemiaDeserontoDorionDouro-DummerDrummond/North ElmsleyDufferin CountyDurham RegionDutton/DunwichEast FerrisEast GarafraxaEast GwillimburyEast Zorra-TavistockEdwardsburgh/CardinalElgin CountyElizabethtown-KitleyEnniskillenErinEssaEssexEssex CountyFort ErieFront of YongeFrontenac CountyGananoqueGeorgian BluffsGeorginaGoderichGrand ValleyGreater NapaneeGreater SudburyGrey CountyGrey HighlandsGrimsbyGuelphGuelph/EramosaHaldimandHalton HillsHalton RegionHamiltonHamilton TownshipHanoverHarleyHastings CountyHavelock-Belmont-MethuenHowickHuron CountyHuron EastHuron-KinlossIngersollInnisfilKawartha LakesKincardineKingKingstonKingsvilleKitchenerLakeshoreLambton CountyLambton ShoresLanark CountyLanark HighlandsLaSalleLeamingtonLeeds And Grenville United CountiesLeeds and the Thousand IslandsLennox And Addington CountyLimerickLincolnLondonLoyalistLucan BiddulphMadocMalahideMapletonMarkhamMarmora and LakeMcKellarMeafordMelancthonMerrickville–WolfordMiddlesex CentreMiddlesex CountyMiltonMintoMississaugaMississippi MillsMonoMontagueMorleyMorris-TurnberryMulmurNew TecumsethNewburyNewmarketNiagara FallsNiagara RegionNiagara-on-the-LakeNipissingNorfolkNorth BayNorth DumfriesNorth DundasNorth FrontenacNorth GlengarryNorth GrenvilleNorth HuronNorth MiddlesexNorth PerthNorth StormontNorthumberland CountyNorwichOakvilleOil SpringsOliver PaipoongeOrangevilleOrilliaOro-MedonteOshawaOtonabee–South MonaghanOttawaOwen SoundOxford CountyPeel RegionPeleePelhamPerthPerth CountyPerth EastPerth SouthPeterboroughPetroliaPickeringPlympton–WyomingPoint EdwardPort ColbornePort HopePrincePrince EdwardPuslinchQuinte WestRamaraRichmond HillRideau LakesRussellSarniaSaugeen ShoresSault Ste. MarieScugogSelwynShelburneShuniahSimcoe CountySmiths FallsSouth BruceSouth Bruce PeninsulaSouth DundasSouth FrontenacSouth GlengarrySouth HuronSouth StormontSouth-West OxfordSouthgateSouthwest MiddlesexSouthwoldSpringwaterSt. CatharinesSt. ClairSt. JosephSt. MarysSt. ThomasStirling-RawdonStone MillsStratfordStrathroy-CaradocTay ValleyTecumsehThames CentreThe NationThoroldThunder BayTillsonburgTimminsTorontoTrent HillsTudor and CashelTweedTyendinagaUxbridgeVaughanWainfleetWarwickWasaga BeachWaterlooWaterloo RegionWellandWellesleyWellington CountyWellington NorthWest ElginWest GreyWest LincolnWest PerthWestportWhitbyWhitchurch-StouffvilleWilmotWindsorWollastonWoodstockWoolwichYork RegionZorra
MunicipalityScopeConservation AuthorityContactSource
Addington HighlandsMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
Adelaide MetcalfeMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Adjala-TosorontioMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
AjaxMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
AlbertonMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Alfred and PlantagenetMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
Alnwick/HaldimandMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
AmaranthMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
AmherstburgMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
Arran–ElderslieMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
Ashfield–Colborne–WawanoshMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Asphodel–NorwoodMunicipalityOtonabee Conservation705-745-5791 · websiteBoundary data
AthensMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
AugustaMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
AuroraMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
AylmerMunicipalityCatfish Creek Conservation Authority519-773-9037 · websiteBoundary data
BaldwinMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
BarrieMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
BayhamMunicipalityLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
BeckwithMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
BellevilleMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
Blandford-BlenheimMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
BluewaterMunicipalityAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
BonfieldMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
Bradford West GwillimburyMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
BramptonMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
BrantMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
BrantfordMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
BrightonMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
BrockMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
BrocktonMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
BrockvilleMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Brooke-AlvinstonMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Bruce CountyCounty / regionGrey Sauble Conservation519-376-3076 · websiteBoundary data
Bruce CountyCounty / regionMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Bruce CountyCounty / regionSaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
BurlingtonMunicipalityConservation Halton905-336-1158 · websiteBoundary data
CaledonMunicipalityCredit Valley Conservation905-670-1615 · websiteBoundary data
CallanderMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
CalvinMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
CambridgeMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Carleton PlaceMunicipalityMississippi Valley Conservation613-253-0006 · websiteBoundary data
CasselmanMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
Cavan MonaghanMunicipalityOtonabee Conservation705-745-5791 · websiteBoundary data
Central ElginMunicipalityCatfish Creek Conservation Authority519-773-9037 · websiteBoundary data
Central FrontenacMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
Central HuronMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Centre HastingsMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
Centre WellingtonMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Chatham-KentMunicipalityLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
ChatsworthMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
ChisholmMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
Clarence-RocklandMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
ClaringtonMunicipalityCentral Lake Ontario Conservation Authority905-579-0411 · websiteBoundary data
ClearviewMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
CobourgMunicipalityGanaraska Region Conservation Authority905-885-8173 · websiteBoundary data
CollingwoodMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
ConmeeMunicipalityLakehead Region Conservation Authority807-344-5857 · websiteBoundary data
CornwallMunicipalityRaisin Region Conservation Authority613-938-3611 · websiteBoundary data
CramaheMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
Dawn-EuphemiaMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
DeserontoMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
DorionMunicipalityLakehead Region Conservation Authority807-344-5857 · websiteBoundary data
Douro-DummerMunicipalityOtonabee Conservation705-745-5791 · websiteBoundary data
Drummond/North ElmsleyMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
Dufferin CountyCounty / regionCredit Valley Conservation905-670-1615 · websiteBoundary data
Dufferin CountyCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
Dufferin CountyCounty / regionNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
Dufferin CountyCounty / regionSaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
Dufferin CountyCounty / regionToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Durham RegionCounty / regionCentral Lake Ontario Conservation Authority905-579-0411 · websiteBoundary data
Durham RegionCounty / regionGanaraska Region Conservation Authority905-885-8173 · websiteBoundary data
Durham RegionCounty / regionKawartha Conservation705-328-2271 · websiteBoundary data
Durham RegionCounty / regionLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Durham RegionCounty / regionOtonabee Conservation705-745-5791 · websiteBoundary data
Durham RegionCounty / regionToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Dutton/DunwichMunicipalityLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
East FerrisMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
East GarafraxaMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
East GwillimburyMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
East Zorra-TavistockMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Edwardsburgh/CardinalMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
Elgin CountyCounty / regionCatfish Creek Conservation Authority519-773-9037 · websiteBoundary data
Elgin CountyCounty / regionKettle Creek Conservation Authority519-631-1270 · websiteBoundary data
Elgin CountyCounty / regionLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
Elgin CountyCounty / regionLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
Elgin CountyCounty / regionUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Elizabethtown-KitleyMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
EnniskillenMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
ErinMunicipalityCredit Valley Conservation905-670-1615 · websiteBoundary data
EssaMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
EssexMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
Essex CountyCounty / regionEssex Region Conservation Authority519-776-5209 · websiteBoundary data
Essex CountyCounty / regionLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
Fort ErieMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
Front of YongeMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Frontenac CountyCounty / regionCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Frontenac CountyCounty / regionMississippi Valley Conservation613-253-0006 · websiteBoundary data
Frontenac CountyCounty / regionQuinte Conservation613-968-3434 · websiteBoundary data
Frontenac CountyCounty / regionRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
GananoqueMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Georgian BluffsMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
GeorginaMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
GoderichMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Grand ValleyMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Greater NapaneeMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
Greater SudburyMunicipalityNickel District Conservation Authority705-674-5249 · websiteBoundary data
Grey CountyCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
Grey CountyCounty / regionGrey Sauble Conservation519-376-3076 · websiteBoundary data
Grey CountyCounty / regionNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
Grey CountyCounty / regionSaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
Grey HighlandsMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
GrimsbyMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
GuelphMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Guelph/EramosaMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
HaldimandMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Halton HillsMunicipalityCredit Valley Conservation905-670-1615 · websiteBoundary data
Halton RegionCounty / regionConservation Halton905-336-1158 · websiteBoundary data
Halton RegionCounty / regionCredit Valley Conservation905-670-1615 · websiteBoundary data
Halton RegionCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
HamiltonMunicipalityHamilton Conservation Authority905-525-2181 · websiteBoundary data
Hamilton TownshipMunicipalityGanaraska Region Conservation Authority905-885-8173 · websiteBoundary data
HanoverMunicipalitySaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
HarleyMunicipalityLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
Hastings CountyCounty / regionCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
Hastings CountyCounty / regionLower Trent Conservation613-394-4829 · websiteBoundary data
Hastings CountyCounty / regionQuinte Conservation613-968-3434 · websiteBoundary data
Havelock-Belmont-MethuenMunicipalityCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
HowickMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Huron CountyCounty / regionAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
Huron CountyCounty / regionMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Huron CountyCounty / regionSaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
Huron CountyCounty / regionUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Huron EastMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Huron-KinlossMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
IngersollMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
InnisfilMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Kawartha LakesMunicipalityKawartha Conservation705-328-2271 · websiteBoundary data
KincardineMunicipalitySaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
KingMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
KingstonMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
KingsvilleMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
KitchenerMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
KitchenerMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
LakeshoreMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
Lambton CountyCounty / regionAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
Lambton CountyCounty / regionSt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Lambton ShoresMunicipalityAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
Lanark CountyCounty / regionMississippi Valley Conservation613-253-0006 · websiteBoundary data
Lanark CountyCounty / regionRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
Lanark HighlandsMunicipalityMississippi Valley Conservation613-253-0006 · websiteBoundary data
LaSalleMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
LeamingtonMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
Leeds And Grenville United CountiesCounty / regionCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Leeds And Grenville United CountiesCounty / regionRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
Leeds And Grenville United CountiesCounty / regionSouth Nation Conservation613-984-2948 · websiteBoundary data
Leeds and the Thousand IslandsMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Lennox And Addington CountyCounty / regionCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Lennox And Addington CountyCounty / regionMississippi Valley Conservation613-253-0006 · websiteBoundary data
Lennox And Addington CountyCounty / regionQuinte Conservation613-968-3434 · websiteBoundary data
LimerickMunicipalityCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
LincolnMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
LondonMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
LoyalistMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
Lucan BiddulphMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
MadocMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
MalahideMunicipalityCatfish Creek Conservation Authority519-773-9037 · websiteBoundary data
MapletonMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
MarkhamMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Marmora and LakeMunicipalityCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
McKellarMunicipalityLakehead Region Conservation Authority807-344-5857 · websiteBoundary data
MeafordMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
MelancthonMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Merrickville–WolfordMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
Middlesex CentreMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Middlesex CountyCounty / regionAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
Middlesex CountyCounty / regionKettle Creek Conservation Authority519-631-1270 · websiteBoundary data
Middlesex CountyCounty / regionLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
Middlesex CountyCounty / regionSt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Middlesex CountyCounty / regionUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
MiltonMunicipalityConservation Halton905-336-1158 · websiteBoundary data
MintoMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
MississaugaMunicipalityCredit Valley Conservation905-670-1615 · websiteBoundary data
Mississippi MillsMunicipalityMississippi Valley Conservation613-253-0006 · websiteBoundary data
MonoMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
MontagueMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
MorleyMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
Morris-TurnberryMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
MulmurMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
New TecumsethMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
NewburyMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
NewmarketMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Niagara FallsMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
Niagara RegionCounty / regionHamilton Conservation Authority905-525-2181 · websiteBoundary data
Niagara RegionCounty / regionNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
Niagara-on-the-LakeMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
NipissingMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
NorfolkMunicipalityLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
North BayMunicipalityNorth Bay Mattawa Conservation Authority705-474-5420 · websiteBoundary data
North DumfriesMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
North DundasMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
North FrontenacMunicipalityMississippi Valley Conservation613-253-0006 · websiteBoundary data
North GlengarryMunicipalityRaisin Region Conservation Authority613-938-3611 · websiteBoundary data
North GrenvilleMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
North HuronMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
North MiddlesexMunicipalityAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
North PerthMunicipalityMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
North StormontMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
Northumberland CountyCounty / regionCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
Northumberland CountyCounty / regionGanaraska Region Conservation Authority905-885-8173 · websiteBoundary data
Northumberland CountyCounty / regionLower Trent Conservation613-394-4829 · websiteBoundary data
Northumberland CountyCounty / regionOtonabee Conservation705-745-5791 · websiteBoundary data
NorwichMunicipalityLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
OakvilleMunicipalityConservation Halton905-336-1158 · websiteBoundary data
Oil SpringsMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Oliver PaipoongeMunicipalityLakehead Region Conservation Authority807-344-5857 · websiteBoundary data
OrangevilleMunicipalityCredit Valley Conservation905-670-1615 · websiteBoundary data
OrilliaMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Oro-MedonteMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
OshawaMunicipalityCentral Lake Ontario Conservation Authority905-579-0411 · websiteBoundary data
Otonabee–South MonaghanMunicipalityOtonabee Conservation705-745-5791 · websiteBoundary data
OttawaMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
Owen SoundMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
Oxford CountyCounty / regionCatfish Creek Conservation Authority519-773-9037 · websiteBoundary data
Oxford CountyCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
Oxford CountyCounty / regionLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
Oxford CountyCounty / regionUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Peel RegionCounty / regionConservation Halton905-336-1158 · websiteBoundary data
Peel RegionCounty / regionCredit Valley Conservation905-670-1615 · websiteBoundary data
Peel RegionCounty / regionLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Peel RegionCounty / regionNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
Peel RegionCounty / regionToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
PeleeMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
PelhamMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
PerthMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Perth CountyCounty / regionAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
Perth CountyCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
Perth CountyCounty / regionMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Perth CountyCounty / regionUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Perth EastMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Perth SouthMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
PeterboroughMunicipalityOtonabee Conservation705-745-5791 · websiteBoundary data
PetroliaMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
PickeringMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Plympton–WyomingMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Point EdwardMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Port ColborneMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
Port HopeMunicipalityGanaraska Region Conservation Authority905-885-8173 · websiteBoundary data
PrinceMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
Prince EdwardMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
PuslinchMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Quinte WestMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
RamaraMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Richmond HillMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Rideau LakesMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
RussellMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
SarniaMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Saugeen ShoresMunicipalitySaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
Sault Ste. MarieMunicipalitySault Ste Marie Region Conservation Authority705-946-8530 · websiteBoundary data
ScugogMunicipalityKawartha Conservation705-328-2271 · websiteBoundary data
SelwynMunicipalityOtonabee Conservation705-745-5791 · websiteBoundary data
ShelburneMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
ShuniahMunicipalityLakehead Region Conservation Authority807-344-5857 · websiteBoundary data
Simcoe CountyCounty / regionGrey Sauble Conservation519-376-3076 · websiteBoundary data
Simcoe CountyCounty / regionLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
Simcoe CountyCounty / regionNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
Simcoe CountyCounty / regionToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Smiths FallsMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
South BruceMunicipalitySaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
South Bruce PeninsulaMunicipalityGrey Sauble Conservation519-376-3076 · websiteBoundary data
South DundasMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
South FrontenacMunicipalityCataraqui Region Conservation Authority613-546-4228 · websiteBoundary data
South GlengarryMunicipalityRaisin Region Conservation Authority613-938-3611 · websiteBoundary data
South HuronMunicipalityAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
South StormontMunicipalityRaisin Region Conservation Authority613-938-3611 · websiteBoundary data
South-West OxfordMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
SouthgateMunicipalitySaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
Southwest MiddlesexMunicipalityLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
SouthwoldMunicipalityLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
SpringwaterMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
St. CatharinesMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
St. ClairMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
St. JosephMunicipalityAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
St. MarysMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
St. ThomasMunicipalityKettle Creek Conservation Authority519-631-1270 · websiteBoundary data
Stirling-RawdonMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
Stone MillsMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
StratfordMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
Strathroy-CaradocMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Tay ValleyMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
TecumsehMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
Thames CentreMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
The NationMunicipalitySouth Nation Conservation613-984-2948 · websiteBoundary data
ThoroldMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
Thunder BayMunicipalityLakehead Region Conservation Authority807-344-5857 · websiteBoundary data
TillsonburgMunicipalityLong Point Region Conservation Authority519-842-4242 · websiteBoundary data
TimminsMunicipalityMattagami Region Conservation Authority705-360-2660 · websiteBoundary data
TorontoMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
Trent HillsMunicipalityLower Trent Conservation613-394-4829 · websiteBoundary data
Tudor and CashelMunicipalityCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
TweedMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
TyendinagaMunicipalityQuinte Conservation613-968-3434 · websiteBoundary data
UxbridgeMunicipalityLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
VaughanMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
WainfleetMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
WarwickMunicipalitySt. Clair Region Conservation Authority519-245-3710 · websiteBoundary data
Wasaga BeachMunicipalityNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
WaterlooMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Waterloo RegionCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
WellandMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
WellesleyMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
Wellington CountyCounty / regionConservation Halton905-336-1158 · websiteBoundary data
Wellington CountyCounty / regionCredit Valley Conservation905-670-1615 · websiteBoundary data
Wellington CountyCounty / regionGrand River Conservation Authority519-621-2761 · websiteBoundary data
Wellington CountyCounty / regionHamilton Conservation Authority905-525-2181 · websiteBoundary data
Wellington CountyCounty / regionMaitland Valley Conservation Authority519-335-3557 · websiteBoundary data
Wellington CountyCounty / regionSaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
Wellington NorthMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
West ElginMunicipalityLower Thames Valley Conservation Authority519-354-7310 · websiteBoundary data
West GreyMunicipalitySaugeen Valley Conservation Authority519-367-3040 · websiteBoundary data
West LincolnMunicipalityNiagara Peninsula Conservation Authority905-788-3135 · websiteBoundary data
West PerthMunicipalityAusable Bayfield Conservation Authority519-235-2610 · websiteBoundary data
WestportMunicipalityRideau Valley Conservation Authority613-692-3571 · websiteBoundary data
WhitbyMunicipalityCentral Lake Ontario Conservation Authority905-579-0411 · websiteBoundary data
Whitchurch-StouffvilleMunicipalityToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
WilmotMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
WindsorMunicipalityEssex Region Conservation Authority519-776-5209 · websiteBoundary data
WollastonMunicipalityCrowe Valley Conservation Authority613-472-3137 · websiteBoundary data
WoodstockMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data
WoolwichMunicipalityGrand River Conservation Authority519-621-2761 · websiteBoundary data
York RegionCounty / regionLake Simcoe Region Conservation Authority905-895-1281 · websiteBoundary data
York RegionCounty / regionNottawasaga Valley Conservation Authority705-424-1479 · websiteBoundary data
York RegionCounty / regionToronto And Region Conservation Authority416-661-6600 · websiteBoundary data
ZorraMunicipalityUpper Thames River Conservation Authority519-451-2800 · websiteBoundary data

Compiled from the Ministry of Natural Resources’ conservation authority administrative area dataset (point-in-polygon on each municipality’s centroid). Retrieved August 10, 2026. Page updated September 17, 2026. This list is informational only — it is not legal advice, and it does not replace confirming current details with the source. Download this data (CSV). You are welcome to cite or reproduce this table with a link back to this page.

Cite this page: https://treadstonelaw.ca/conservation-authorities-ontario-by-municipality — Treadstone Law, updated September 17, 2026. Rows: 334 across 270 municipalities.

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