Is a Brockville address in a regulated flood area, and whose map says so?

Cataraqui Conservation says its jurisdiction extends from Greater Napanee in the west to Brockville in the east, and the City of Brockville holds agreements with it for the Booths Falls diversion channel and the Buell's Creek detention basin. Under Ontario Regulation 41/24 it regulates lands subject to natural hazards such as floodplains, erosion-prone areas, steep slopes, unstable bedrock, wetlands, rivers, creeks, streams and lakes, and the land next to them. Its online Regulation Screening Map shows the regulated areas, and its Property Inquiry Form, for owners, purchasers and their representatives, asks whether a property is in a regulated area. The City's Zoning By-law shows the authority's screening area on its Appendix 1, says the actual regulated area may differ, and bars development, including placing or removing fill, in a regulated area without the authority's prior written approval.

The authority says Planning Act approval does not exempt a project from its permit, nor does its approval exempt a project from other approvals, such as a building permit. A regulated-area result governs permits; it is not a forecast that a home will flood, and a home outside the mapped area can still take water through a basement. Under the Conservation Authorities Act as amended in 2026, Cataraqui Conservation is to join the Eastern Lake Ontario Regional Conservation Authority on 1 February 2027 or a later date set by regulation.

• Cataraqui Conservation: planning and permitting: the Regulation Screening Map and the property and permit inquiry forms
• Cataraqui Conservation: frequently asked questions: its jurisdiction, what it regulates and its permits beside the building permit
• Cataraqui Conservation: governance: its member municipalities and its agreements with the City of Brockville
• Zoning By-law 050-2014, Section 3: General Provisions: section 3.12 on the conservation authority's screening area (PDF)
• Zoning By-law Appendix 1: screening area: the screening area map (PDF)
• Bill 97, Plan to Protect Ontario Act (Budget Measures), 2026: Schedule 3 amends the Conservation Authorities Act; the transition date is 1 February 2027 or a later date set by regulation
• Regional conservation authority boundaries (ERO 025-1257): the Province's decision of 10 March 2026 on which authority joins which of the nine regional authorities
• Ontario Regulation 41/24: Prohibited Activities, Exemptions and Permits, the regulation behind every conservation authority's regulated area

Conservation-authority regulated-area and flood plain checks are not currently included in our reports, so for a Brockville home the authority's own map is the place to look. The full report's water and flooding group does cover past floods seen by satellite, nearby creeks, rivers and ponds, and mapped wetlands for any Brockville address.

What we cover, city by city See the sample report