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

Two conservation authorities share Caledon, and the Town's building permit declaration form names both for approvals under section 28 of the Conservation Authorities Act. The Toronto and Region Conservation Authority's jurisdiction takes in the Humber River and Etobicoke Creek watersheds, among others, and its own table puts 55% of Caledon's population inside it; its Regulated Area Search takes an address or postal code, and it says not every regulated area is mapped and a feature doesn't have to be mapped to be regulated. Credit Valley Conservation, which lists Caledon among the member municipalities that fund it, covers the Credit River watershed and publishes a regulation map viewer, updated by its board on February 20, 2026, and a floodplain map viewer.

TRCA says that under the Building Code Act its permit is needed before the municipality issues a building permit for work in its regulated area, so its permit doesn't replace the Town's. 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 Toronto and Region authority is to join the Central Lake Ontario Regional Conservation Authority, and Credit Valley Conservation the Western Lake Ontario Regional Conservation Authority, on 1 February 2027 or a later date set by regulation.

• TRCA Regulated Area Search: the address search for the Toronto and Region Conservation Authority's regulated area, with a link to its Flood Plain Map Viewer
• About TRCA: jurisdiction: the authority's watersheds and the share of each municipality's population inside them
• TRCA: apply for a permit: the authority's permits, needed before a municipal building permit in its regulated area
• CVC regulation mapping: Credit Valley Conservation's regulation and floodplain map viewers, updated February 20, 2026
• Credit Valley Conservation: who we are: the authority and the member municipalities that fund it
• Applicable Law Declaration Form: the Town's building permit form naming Credit Valley Conservation and TRCA for conservation authority approvals (PDF)
• Conservation Halton Board meeting, June 18, 2026: the board report on the Western Lake Ontario Regional Conservation Authority transition, with Credit Valley, Hamilton and Niagara Peninsula (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 Caledon 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 Caledon address.

What we cover, city by city See the sample report