Currently serving Ontario, Canada. Other provinces coming soon.
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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

ABCA
Southwestern Ontario

Ausable River, Bayfield River watersheds

Cataraqui Region Conservation Authority

CRCA
Eastern Ontario

Cataraqui River, Gananoque River watersheds

Catfish Creek Conservation Authority

CCCA
Southwestern Ontario

Catfish Creek watershed

Central Lake Ontario Conservation Authority

CLOCA
Central Ontario

Oshawa, Bowmanville, Newcastle watersheds

Conservation Halton

CH
Greater Toronto Area

Bronte Creek, Grindstone Creek, Spencer Creek

Conservation Sudbury

CS
Northern Ontario

Junction Creek, Vermilion River watersheds

Credit Valley Conservation

CVC
Greater Toronto Area

Credit River watershed

Essex Region Conservation Authority

ERCA
Southwestern Ontario

Essex County watersheds

Ganaraska Region Conservation Authority

GRCA-G
Central Ontario

Ganaraska River watershed

Grand River Conservation Authority

GRCA
Southwestern Ontario

Grand River watershed (largest in southern Ontario)

Grey Sauble Conservation Authority

GSCA
Central Ontario

Grey and Bruce County watersheds

Hamilton Conservation Authority

HCA
Greater Toronto Area

Hamilton area watersheds

Kawartha Conservation

KC
Central Ontario

Kawartha Lakes area watersheds

Kettle Creek Conservation Authority

KCCA
Southwestern Ontario

Kettle Creek watershed

Lake Simcoe Region Conservation Authority

LSRCA
Central Ontario

Lake Simcoe watershed

Lakehead Region Conservation Authority

LRCA
Northern Ontario

Thunder Bay area watersheds

Long Point Region Conservation Authority

LPRCA
Southwestern Ontario

Long Point, Big Creek watersheds

Lower Thames Valley Conservation Authority

LTVCA
Southwestern Ontario

Lower Thames River watershed

Lower Trent Conservation

LTC
Eastern Ontario

Lower Trent River watershed

Maitland Valley Conservation Authority

MVCA
Southwestern Ontario

Maitland River watershed

Mattagami Region Conservation Authority

MRCA
Northern Ontario

Mattagami River watershed

Mississippi Valley Conservation Authority

MVCA-M
Eastern Ontario

Mississippi River watershed

Napanee Region Conservation Authority

NRCA
Eastern Ontario

Napanee River watershed

Niagara Peninsula Conservation Authority

NPCA
Niagara Region

Niagara Peninsula watersheds

North Bay-Mattawa Conservation Authority

NBMCA
Northern Ontario

North Bay, Mattawa area watersheds

Nottawasaga Valley Conservation Authority

NVCA
Central Ontario

Nottawasaga River watershed

Otonabee Conservation

OC
Central Ontario

Otonabee River, Indian River watersheds

Quinte Conservation

QC
Eastern Ontario

Moira River, Salmon River watersheds

Raisin Region Conservation Authority

RRCA
Eastern Ontario

Raisin River watershed

Rideau Valley Conservation Authority

RVCA
Eastern Ontario

Rideau River watershed

Saugeen Valley Conservation Authority

SVCA
Central Ontario

Saugeen River watershed

South Nation Conservation

SNC
Eastern Ontario

South Nation River watershed

St. Clair Region Conservation Authority

SCRCA
Southwestern Ontario

Sydenham River, St. Clair River watersheds

Toronto and Region Conservation Authority

TRCA
Greater Toronto Area

Toronto, York, Peel, Durham watersheds

Upper Thames River Conservation Authority

UTRCA
Southwestern Ontario

Upper Thames River watershed

Upper Trent Conservation

UTC
Central Ontario

Upper 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.