Is a Barrie address in a regulated flood area, and whose map says so?
The Lake Simcoe Region Conservation Authority's regulation maps and the Nottawasaga Valley Conservation Authority's interactive map, under Ontario Regulation 41/24.
Sources checked October 28, 2026
Conservation authorities in 2027
Lake Simcoe Region authorityNottawasaga Valley authorityjoinLake Huron Regional Conservation Authority
On 1 February 2027 or a later date set by regulation, under the Conservation Authorities Act as amended in 2026.
- The recordFlood plain and regulated area
- Where to read itLSRCA regulation maps; LSRCA: do I need a permit and 4 more
- In the full reportWith the address's other records
What the record shows
Two conservation authorities cover Barrie. The Lake Simcoe Region Conservation Authority names Barrie among the communities of the Lake Simcoe watershed, and the Nottawasaga Valley Conservation Authority lists the City of Barrie among the municipalities in the Nottawasaga watershed, so which map applies depends on where a home drains. 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 by email or phone.
Lake Simcoe Region says work near a lake, river, stream, steep slope or wetland may need its approval, and that a municipal permit may be needed as well. 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. The City's own additional unit rules exclude properties in a hazard zone. 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.
Where to read it yourself
- LSRCA regulation maps: the Lake Simcoe Region authority's interactive regulation map viewer and its yearly updates
- LSRCA: do I need a permit: what work needs the authority's permit in a regulated area
- NVCA: find your property: the Nottawasaga Valley authority's interactive map and how to ask staff
- Ontario Regulation 41/24: 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
What OfferDue covers in Barrie
Conservation-authority regulated-area and flood plain checks are not currently included in our reports, so for a Barrie 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 Barrie address.
Public-record information, not legal, financial, insurance or inspection advice. Records change and can be incomplete, and this page describes the records, not any particular home. What we cover, city by city.