Ontario Conservation Authorities Directory
All 36 Ontario conservation authorities with contact information, mapping tools, and coverage areas. Use this directory to identify which CA has jurisdiction over your property.
Professional Disclaimer
This is an AI-generated informational snapshot. It is NOT legal, engineering, architectural, or permitting advice. All data must be verified with the municipality and qualified licensed professionals. Do not make construction, purchasing, or investment decisions based solely on this report.
Showing 36 of 36 conservation authorities
Ausable Bayfield Conservation Authority
ABCAAusable River, Bayfield River watersheds
Cataraqui Region Conservation Authority
CRCACataraqui River, Gananoque River watersheds
Catfish Creek Conservation Authority
CCCACatfish Creek watershed
Central Lake Ontario Conservation Authority
CLOCAOshawa, Bowmanville, Newcastle watersheds
Conservation Halton
CHBronte Creek, Grindstone Creek, Spencer Creek
Conservation Sudbury
CSJunction Creek, Vermilion River watersheds
Credit Valley Conservation
CVCCredit River watershed
Essex Region Conservation Authority
ERCAEssex County watersheds
Ganaraska Region Conservation Authority
GRCA-GGanaraska River watershed
Grand River Conservation Authority
GRCAGrand River watershed (largest in southern Ontario)
Grey Sauble Conservation Authority
GSCAGrey and Bruce County watersheds
Hamilton Conservation Authority
HCAHamilton area watersheds
Kawartha Conservation
KCKawartha Lakes area watersheds
Kettle Creek Conservation Authority
KCCAKettle Creek watershed
Lake Simcoe Region Conservation Authority
LSRCALake Simcoe watershed
Lakehead Region Conservation Authority
LRCAThunder Bay area watersheds
Long Point Region Conservation Authority
LPRCALong Point, Big Creek watersheds
Lower Thames Valley Conservation Authority
LTVCALower Thames River watershed
Lower Trent Conservation
LTCLower Trent River watershed
Maitland Valley Conservation Authority
MVCAMaitland River watershed
Mattagami Region Conservation Authority
MRCAMattagami River watershed
Mississippi Valley Conservation Authority
MVCA-MMississippi River watershed
Napanee Region Conservation Authority
NRCANapanee River watershed
Niagara Peninsula Conservation Authority
NPCANiagara Peninsula watersheds
North Bay-Mattawa Conservation Authority
NBMCANorth Bay, Mattawa area watersheds
Nottawasaga Valley Conservation Authority
NVCANottawasaga River watershed
Otonabee Conservation
OCOtonabee River, Indian River watersheds
Quinte Conservation
QCMoira River, Salmon River watersheds
Raisin Region Conservation Authority
RRCARaisin River watershed
Rideau Valley Conservation Authority
RVCARideau River watershed
Saugeen Valley Conservation Authority
SVCASaugeen River watershed
South Nation Conservation
SNCSouth Nation River watershed
St. Clair Region Conservation Authority
SCRCASydenham River, St. Clair River watersheds
Toronto and Region Conservation Authority
TRCAToronto, York, Peel, Durham watersheds
Upper Thames River Conservation Authority
UTRCAUpper Thames River watershed
Upper Trent Conservation
UTCUpper Trent River watershed
Why Conservation Authorities Matter
Conservation authorities (CAs) in Ontario regulate development and site alteration activities within their jurisdiction under the Conservation Authorities Act and Ontario Regulation 41/24 (formerly individual CA regulations).
If your property falls within a CA's regulated area — which includes wetlands, floodplains, shorelines, steep slopes, and areas near watercourses — you may need a CA permit in addition to your municipal building permit.
CA permits can add 4-12 weeks to your project timeline and typically cost between $500-$5,000+ depending on the scope. Identifying CA jurisdiction early is critical for accurate project planning.
Note: CA contact information and website URLs may change. Always verify directly with the conservation authority. Last updated: February 2026.