Buying Agricultural Land in Ontario: Zoning, Conservation Authorities, and What Farmers Miss

Purchasing farmland in Ontario is not like buying a suburban house. The land carries layers of regulatory interests — municipal zoning, provincial policy overlays, watershed jurisdiction, and environmental legislation — that simply do not appear in a standard title search. Buyers who focus only on price per acre and soil quality routinely discover, after closing, that they cannot build the second residence they planned, drain a low-lying field, or clear a woodlot without a permit they did not know existed.

This article walks through the key legal checkpoints for buying agricultural land Ontario buyers should clear before signing an Agreement of Purchase and Sale (APS). It focuses on Ontario law only, and covers conservation authority jurisdiction, the Greenbelt Plan, drainage rights, environmental due diligence, and the contract conditions that protect you if problems emerge.

Agricultural Zoning: What the Designation Actually Allows

Most rural municipalities in Ontario designate farmland as Agricultural in their official plan and zoning by-law. That designation protects the land from urban sprawl — but it also restricts what you can do on it.

Permitted uses typically include:

• Growing crops, keeping livestock, and related farm operations
• One farm dwelling per lot (subject to conditions)
• Value-added uses directly tied to the farm (e.g., a small farm-gate retail stand)
• Accessory structures (barns, silos, drive sheds)

What agricultural zoning usually does not permit:

• A second full dwelling for a non-family member without a severance or rezoning
• Industrial processing beyond the farm's own product
• Short-term rental operations (in many municipalities)
• Commercial kennels or other intensive non-farm uses without a rezoning

Check the specific zoning by-law, not just the provincial designation. Minimum lot size rules, setback requirements from property lines and water features, and nutrient management setbacks all vary by municipality. A zoning certificate from the municipality confirms permitted uses in writing.

Farm Dwelling Permissions

Ontario's Planning Act and provincial policy generally support one dwelling per agricultural lot. A second dwelling — sometimes called a supplemental residence for farm help — requires satisfying strict tests about farm size and labour needs. Never assume a second house can be added; get written confirmation from the municipality before you buy.

Greenbelt Plan and Oak Ridges Moraine Conservation Plan

If the land falls within the Greenbelt Plan area or the Oak Ridges Moraine Conservation Plan area, additional provincial restrictions apply. These plans generally:

• Prohibit most new lot creation (severances) within the Protected Countryside
• Restrict development that would fragment agricultural parcels
• Require that any new infrastructure — a new access road, a new building cluster — comply with plan policies before a building permit can issue

Before making an offer, confirm the land's status under these plans by reviewing the Ontario Land Use Maps (available from the Ministry of Municipal Affairs and Housing). If the property is inside either plan area, any development plans you have may be significantly constrained regardless of what the local zoning says.

Conservation Authority Jurisdiction

Red flags that suggest a Conservation Authority permit may be required:

• A river, creek, pond, or drain runs through or along the property
• The seller's listing mentions "wetland," "floodplain," or "regulated area"
• The property is near the Lake Ontario shoreline or a Great Lake tributary
• The topography shows a significant valley or ravine
• Aerial photos show standing water or a change in vegetation suggesting a marsh

Ontario's Conservation Authorities Act gives each of Ontario's 36 conservation authorities the power to regulate three categories of activity within their jurisdiction:

1. Development — placing or removing fill, constructing or altering a building, or grading land within a regulated area (typically adjacent to a watercourse or wetland)
2. Interference with Wetlands — any alteration of a provincially significant or locally significant wetland
3. Alterations to Shorelines and Watercourses — straightening, widening, deepening, or redirecting a natural channel

Before closing, contact the relevant conservation authority — each authority publishes regulated area mapping online — and ask whether the specific parcel contains regulated features. If it does, any activity you plan (tile drain repair, new barn near a creek, clearing vegetation along a slope) may require a permit from the conservation authority in addition to any municipal approvals. Without that permit, you could face stop-work orders, restoration costs, and fines.

Drainage and Tile Drain Rights Under the Drainage Act

Flat agricultural land in Ontario is often underlain by an extensive network of subsurface tile drains connected to a municipal drain. The Drainage Act (Ontario) governs this system and gives landowners both rights and obligations:

• You may be assessed a share of the cost to maintain or improve a municipal drain that serves your land
• You have the right to petition for a new or improved drain if your land needs better drainage
• Blocking or diverting a municipal drain without approval is an offence

Before buying, ask the seller to disclose all drain assessment schedules (municipal drains that cross or abut the property). An unexpected assessment can run tens of thousands of dollars for a single improvement project.

Aggregate Resource Overlay

Check Ontario's Aggregate Resources Act mapping to determine whether the land sits within an area of aggregate resource potential (sand, gravel, or bedrock). An overlay designation does not prevent farming today, but it signals that a nearby aggregate operation may expand and affect the rural character of the area.

Environmental Due Diligence: Phase I Environmental Site Assessment

A Phase I Environmental Site Assessment (ESA) is a document review and site inspection — no soil samples — that identifies historical land uses that may have caused contamination. Farm properties are often exempt from lender-required ESAs, but prudent buyers order one anyway. Common issues on Ontario farmland include:

• Old underground fuel storage tanks for heating oil or diesel
• Decommissioned farm chemical storage areas
• Historical waste disposal on the back of a large parcel

If a Phase I identifies "areas of potential environmental concern," a Phase II ESA (sampling) follows. Discovering contamination after closing makes you the owner of the problem. Under Ontario's Environmental Protection Act, cleanup obligations can attach to the current landowner regardless of who caused the contamination.

Nutrient Management Plans

Ontario's Nutrient Management Act applies to farms that generate or receive agricultural source materials (livestock manure, biosolids). If you are buying a working livestock operation, ask whether a Nutrient Management Strategy or Plan is already registered with the Ministry of Agriculture, Food and Agri-Business. You may inherit obligations tied to that plan, including setback distances from watercourses and maximum application rates.

Conditions to Include in the Agreement of Purchase and Sale

Your APS should be conditional on at least the following:

• Zoning confirmation — written confirmation from the municipality of permitted uses and minimum lot requirements
• Conservation authority clearance — a letter or regulated area mapping confirming no regulated features exist, or a conservation authority permit if features are identified
• Environmental review — satisfactory Phase I ESA (and Phase II if triggered)
• Drainage Act review — disclosure and review of all drain assessment schedules
• Greenbelt/Moraine status — confirmation of plan area status and any applicable policy restrictions
• Nutrient management disclosure — copies of any registered strategies or plans
• Financing — standard mortgage condition
• Lawyer review — your counsel reviews title, survey, and all disclosed approvals

Each condition should name a specific deadline and state that the condition is for the sole benefit of the buyer, waivable in writing.

Frequently asked questions