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

The Town's zoning and additional units page links two conservation authorities' mapping tools, Lake Simcoe Region's and Nottawasaga Valley's, for checking whether a property is in a regulated area. Lake Simcoe Region's planning page lists the Town of New Tecumseth within its jurisdiction, and Nottawasaga Valley lists New Tecumseth 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.

The Town's page says a regulated property may need a permit from its conservation authority before a building permit is applied for, so the authority's permit comes first and doesn't replace the Town's. Both authorities issue their permits under Ontario Regulation 41/24. 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. 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 & Additional Residential Units (ARUs): the Town's page on Zoning By-law 2021-128, its schedules, additional units and conservation authority mapping
• 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
• 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
• 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 a New Tecumseth 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 New Tecumseth address.

What we cover, city by city See the sample report