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

Three authorities share the Municipality. The Central Lake Ontario Conservation Authority counts Clarington among its municipal partners; its regulation area mapping, endorsed in November 2025, covers Courtice, Bowmanville, Hampton, Solina, Enniskillen, Tyrone and the shoreline on sheets named for them, and it publishes a Floodplain Mapping Tool for property owners. The Ganaraska Region Conservation Authority's watersheds run east from Wilmot Creek in Clarington; it answers questions about a property through its inquiry process. Kawartha Conservation lists Clarington among its six municipal partners and points property owners to Conservation Ontario's CA Maps to see whether a property is in its regulated area. The Region's conservation authorities page also shows regulated areas on the yourDurham interactive map.

Each authority's permit is its own approval under Ontario Regulation 41/24: the Ganaraska authority says one may be needed for a new home, addition, accessory structure, pool, deck or septic system, or for fill and grading, and Kawartha Conservation says one is needed before any development in its regulated area gets started. The Municipality's zoning permits no additional dwelling units in the Environmental Protection Zone, and its page names floodplains among the lands where none are allowed. A regulated-area result governs permits for work near water; 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 Central Lake Ontario authority is to join the Central Lake Ontario Regional Conservation Authority, and the Ganaraska Region authority and Kawartha Conservation the Eastern Lake Ontario Regional Conservation Authority, on 1 February 2027 or a later date set by regulation.

• CLOCA regulation area mapping: the authority's regulated area map sheets, updated November 2025
• CLOCA flood protection and prevention: the authority's Floodplain Mapping Tool
• About CLOCA: the watershed and the authority's municipal partners
• GRCA inquiries and permitting: the Ganaraska authority's property inquiries and what its permits cover
• Ganaraska Region Conservation Authority: the authority's watersheds and the municipalities they cover
• Kawartha Conservation property mapping: how to see whether a property is in the regulated area
• About Kawartha Conservation: the watershed and its six municipal partners
• Durham Region: conservation authorities: the five authorities in Durham, the yourDurham map of regulated areas, and the planned consolidation
• 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 Clarington 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 Clarington address.

What we cover, city by city See the sample report