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

The Town's zoning page says the Lake Simcoe Region Conservation Authority and the Nottawasaga Valley Conservation Authority both regulate land use in parts of Innisfil, based on hazards, flooding, natural features, watercourses and shorelines. Lake Simcoe Region's planning page lists the Town of Innisfil within its jurisdiction, and Nottawasaga Valley lists it among the municipalities in the Nottawasaga watershed. Each publishes a map for looking up a property: Lake Simcoe Region its interactive regulation map viewer, which it reviews every year (it says the 2026 updates are expected to be final by the end of November), and Nottawasaga Valley its interactive map, with staff to review a property and the plans for it through its online inquiry.

Both authorities issue their permits under Ontario Regulation 41/24, and Lake Simcoe Region says the municipality may require its own permit as well, so an authority's permit is not the Town's building permit. A regulated-area result governs permits for building, grading and filling; it is not a forecast that a home will flood, and a home outside the mapped area can still take water through a basement. The Town's accessory dwelling unit rules exclude land with flooding or erosion hazards. Under the Conservation Authorities Act as amended in 2026, the Lake Simcoe Region authority and the Nottawasaga Valley authority are to join the Lake Huron Regional Conservation Authority on 1 February 2027 or a later date set by regulation.

• Zoning By-law: the Town's zoning page, naming the two conservation authorities that regulate parts of the town
• LSRCA regulation maps: the Lake Simcoe Region authority's interactive regulation map viewer and its yearly updates
• LSRCA: planning: the municipalities within the Lake Simcoe Region authority's jurisdiction
• LSRCA: do I need a permit: what work needs the authority's permit in a regulated area, and its note that the municipality may require one
• NVCA: find your property: the Nottawasaga Valley authority's interactive map and how to ask staff
• NVCA: about us: the municipalities in the Nottawasaga watershed
• Ontario Regulation 41/24: Prohibited Activities, Exemptions and Permits, the regulation behind every conservation authority's regulated area
• 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

Conservation-authority regulated-area and flood plain checks are not currently included in our reports, so for an Innisfil 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 Innisfil address.

What we cover, city by city See the sample report