Welcome to NBMCA.ca

North Bay-Mattawa Conservation Authority

NBMCA was founded in 1972 by the Province of Ontario.
As a community-based, non-profit environmental organization, NBMCA is dedicated to
conserving, restoring, developing and managing renewable natural resources on a watershed basis.
NBMCA is one of 36 Conservation Authorities who are members of Conservation Ontario.

NBMCA acknowledges that we are in Robinson-Huron Treaty territory, the Traditional Territory and Treaty Lands

of the Nbisiing Anishinaabeg, as well as the unceded and ancestral Traditional Territory
of the Algonquin People and the Metis Nation.

Want to honor a Watershed Champion?

Boardwalk of Champions

Our watershed overflows with champions, people whose actions - big and small - have contributed to the health and well-being of our families, our neighbourhoods, our communities, our environment and our watershed.

Permits

Development and On-site Sewage

Permits are one tool for balancing human needs with the needs
of the natural environment, protecting people and property
from natural hazards.

Science

Integrated Watershed Management

From water quality monitoring and flood forecasting to drinking water source protection, NBMCA uses science to make watershed management decisions.

Get Outside!

Conservation Areas

Looking to hike, bike, or ski?
Paddle a historic canoe route?
Explore our natural heritage?

News

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November 28, 2023

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Low Water Advisory – Level 1 Condition Issued for the North Bay – Mattawa Watershed

December 15, 2025

A Low Water Advisory for Level 1 Conditions has been issued for the North Bay-Mattawa watershed, according to the North Bay-Mattawa Conservation Authority (NBMCA). This is downgrading the confirmed Level 2 Condition that was issued in October.

Snow Survey Readings for December 15, 2025

December 15, 2025

Today’s snow survey measurements show a snow depth increase of 8.0 cm, and snow water equivalence increase of 14.7 mm from the last survey on December 1, reports the North Bay-Mattawa Conservation Authority (NBMCA) who measures snow depth and water content as part of its Flood Forecasting and Warning Program.

SNOW SURVEY READINGS for December 1, 2025

December 01, 2025

Snow observed on November 14, 2025 brought snow depths in Chisholm and North Bay above normal levels, though Corbeil remained snow-free. Today’s snow survey measurements show a snow depth increase of 9.0 cm, and snow water equivalence increase of 10 mm, reports the North Bay-Mattawa Conservation Authority (NBMCA) who measures snow depth and water content as part of its Flood Forecasting and Warning Program.

NBMCA Members (Board) Expenses

November 14, 2025

NBMCA has now posted members' (board) expenses for 2023 and 2024.

Budget and Audited Financial Statements