Can nearby aggregate or gravel extraction affect my well water supply, and what recourse do I have in Ontario?

Yes, nearby aggregate or gravel pit operations can affect a private well, since large-scale extraction can alter local groundwater flow, lower the water table in the surrounding area, or in some cases affect water quality through increased sediment or altered drainage patterns. Aggregate operations in Ontario are subject to their own licensing and approval process, which can include conditions specifically intended to protect nearby water supplies, though the degree of actual protection depends on the specific site and conditions attached to that particular operation.

If you experience an actual, documented change in your well's yield or quality that coincides with nearby aggregate activity, your recourse generally starts with raising the issue with the relevant provincial authority overseeing the operation, since a licensed pit's approval conditions may already address exactly this kind of impact and provide a mechanism for a complaint or remedy. You may also have a separate civil claim against the operator if you can establish the extraction activity actually caused the harm to your well. Establishing a documented baseline of your well's yield and water quality before or early in an aggregate operation's life makes any later comparison, and any resulting claim, much stronger.