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

Two conservation authorities share King. The Toronto and Region Conservation Authority's own table puts 45% of King's population inside its jurisdiction, and its Regulated Area Search takes an address; it says mapping is updated periodically and not all regulated areas may be mapped. The Lake Simcoe Region Conservation Authority's planning page lists the Township of King in its jurisdiction, and its lookup shows whether a property is regulated, with staff to answer by phone or email; it notes that watershed boundaries don't follow municipal ones. The Township's Official Plan illustrates both authorities' Regulation Limits in its Appendix 1, says the text of the regulations prevails over any mapping, and sets out a Schomberg Special Policy Area, based on the Lake Simcoe Region authority's 1993 Flood Plain Mapping Study, for limited development below the Regulatory Floodline in the village core.

Both authorities issue permits under Ontario Regulation 41/24 for work such as building, site grading or placing fill in a regulated area. Neither permit replaces the Township's: the Toronto and Region authority says a municipality cannot legally issue a building permit until its permit or clearance has been obtained, and the Lake Simcoe Region authority says the municipality may require its own permit. A regulated-area result governs permits for work near water, such as additions, decks and grading; 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 is to join the Lake Huron Regional Conservation Authority, and the Toronto and Region authority the Central Lake Ontario Regional Conservation Authority, on 1 February 2027 or a later date set by regulation.

• About TRCA: jurisdiction: the authority's watersheds and the share of each municipality's population inside them
• TRCA Regulated Area Search: the address search for the Toronto and Region Conservation Authority's regulated area
• TRCA: building a new home: the authority's permit and the municipality's building permit
• LSRCA: planning: the Lake Simcoe Region authority's municipalities, the Township of King among them
• LSRCA: for realtors: the authority's property lookup and its note on watershed boundaries
• LSRCA: do I need a permit: the authority's permits, and its note that the municipality may require one
• Our King Official Plan (June 2023 office consolidation): the Township's natural hazard policies, Appendix 1 and the Schomberg Special Policy Area (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 King home the authorities' own maps are 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 King address.

What we cover, city by city See the sample report