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

The Mattagami Region Conservation Authority's watershed includes the City of Timmins, and the City and the Province share its funding. Its Regulated Areas page links an interactive map of its regulated areas, floodplains and wetlands, searchable by address: shaded blue areas are regulated and red lines are mapped floodlines. The authority says map lines are approximate, some regulated areas are not mapped and its regulations still apply, the map shows riverine floodplains only, not urban flooding from drainage limits, and it has recently updated its floodplain mapping for the City, some of it over 40 years old. In its jurisdiction the regulated flood is the 1:100 year flood or the Regional Storm, the 1961 Timmins storm of about 193 mm of rain in 12 hours. Its property inquiry service gives buyers a letter on the natural features, setbacks and reports that apply, for a fee.

The authority says its permit does not replace building permits or any other permits from municipal offices and other agencies, and it also administers the City's Site Alteration By-law 2019-8343 for grading, fill and shoreline vegetation, a permit a building permit does not exempt. A regulated-area result governs permits; 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 Mattagami Region authority is to join the Northeastern Ontario Regional Conservation Authority on 1 February 2027 or a later date set by regulation.

• MRCA: regulated areas: the authority's interactive map and what a regulated result means
• MRCA: floodplain mapping: the updated mapping for the City and the regulated flood hazard
• MRCA: property inquiry service: the letter on a property for owners and buyers
• MRCA: permits and planning: what needs the authority's permit, and the permits it doesn't replace
• MRCA: site alteration: the City's Site Alteration By-law 2019-8343, administered by the authority
• MRCA: our watershed: the watershed, which includes the City of Timmins
• 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 Timmins 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 Timmins address.

What we cover, city by city See the sample report