Well water testing in Canada, province by province

Testing turns a well from an unknown into a managed asset. For a commercial, agricultural or municipal well, it is how you confirm the water is safe for its use, catch contamination early, and show that you are meeting the requirements that apply to your site. In Canada those requirements come from the province or territory, so this guide explains the general picture and points you to the authority for each part of the country.

Part of the three guides on Commercial Well Service, with commercial well inspection and well decommissioning.

Why testing matters for operators

A well can change without warning. A drop in water level, a new nearby land use, a damaged casing or a failing treatment system can all affect water quality. Regular testing gives you a baseline and a trend. If something changes, you can act before it affects staff, customers, livestock or a process, and you have records to show what you knew and when.

What is typically tested

The exact panel depends on the site, but most commercial testing starts with indicator bacteria — total coliform and E. coli — and nitrate. From there, a laboratory may test for metals such as arsenic, lead and uranium, plus hardness, pH, sulphate, sodium and other parameters relevant to the use of the water and the geology of the area. A qualified testing provider can help design a panel for your operation.

Ontario

Ontario maintains a public record of water wells and sets construction, testing and decommissioning requirements through the Ministry of the Environment, Conservation and Parks (MECP). Operators can look up Ontario well records and should confirm the current testing expectations for their type of well and water use. Commercial, farm and municipal wells are all within scope.

How testing is regulated across Canada

Each province and territory manages water wells through its own environment, health or water agency, and the requirements — what to test, how often, and who may do the work — differ. The table below lists the authority to start with for each province and territory, and links to contractors in that area. Confirm the specifics for your well with the authority, since this page cannot reproduce every local rule.

• Alberta — Alberta groundwater. Alberta commercial, agricultural and municipal operators draw on groundwater under provincial approval. Confirm current licences, testing and reporting duties with the province before work starts. Contractors in Alberta.
• British Columbia — BC water licences and approvals (Water Sustainability Act). In British Columbia, groundwater use and works are managed under the Water Sustainability Act. Commercial and agricultural users should confirm licensing and well reporting duties with the province. Contractors in British Columbia.
• Manitoba — Manitoba Water Branch. Manitoba farms and commercial sites often rely on private wells. Decommissioning an unused well is a provincial responsibility for the owner, so plan the work with a qualified contractor. Contractors in Manitoba.
• New Brunswick — New Brunswick Environment and Local Government. New Brunswick businesses, farms and municipalities should confirm well construction, testing and decommissioning requirements with the provincial department before work begins. Contractors in New Brunswick.
• Newfoundland and Labrador — Newfoundland and Labrador Environment and Climate Change. In Newfoundland and Labrador, water resources are managed provincially. Confirm permitting and decommissioning expectations with the department for any commercial or agricultural well. Contractors in Newfoundland and Labrador.
• Northwest Territories — Northwest Territories Environment and Climate Change. Northwest Territories operations, camps and communities should confirm water licensing and well decommissioning duties with the territorial government, which manages water use in the territory. Contractors in Northwest Territories.
• Nova Scotia — Nova Scotia Environment and Climate Change — water. Nova Scotia commercial and agricultural operations should confirm well construction, testing and abandonment requirements with the provincial environment department. Contractors in Nova Scotia.
• Nunavut — Government of Nunavut — environment. Nunavut water use is managed through territorial and federal processes. Confirm licensing and decommissioning expectations with the Government of Nunavut before planning well work. Contractors in Nunavut.
• Ontario — Ontario well records (MECP). Ontario keeps well records and sets construction, testing and decommissioning rules for water wells. Commercial, farm and municipal owners should check the provincial requirements and available records. Contractors in Ontario.
• Prince Edward Island — Prince Edward Island — water. Prince Edward Island relies heavily on groundwater. Commercial and agricultural well owners should confirm testing, permitting and decommissioning requirements with the province. Contractors in Prince Edward Island.
• Quebec — Quebec groundwater (MELCCFP). Quebec manages groundwater and water withdrawal under provincial rules. Commercial, agricultural and municipal operators should confirm authorizations and testing duties with the ministry. Contractors in Quebec.
• Saskatchewan — Saskatchewan Water Security Agency. In Saskatchewan, the Water Security Agency manages water use. Farms and commercial sites should confirm approvals, testing and decommissioning duties before drilling or abandoning a well. Contractors in Saskatchewan.
• Yukon — Yukon — water. Yukon water use is managed through territorial processes. Confirm licensing, testing and decommissioning expectations with the Government of Yukon for commercial and agricultural wells. Contractors in Yukon.

Practical testing routine

• Test on a schedule, and after any change in taste, odour, colour or yield.
• Use a qualified laboratory and keep every result in your site records.
• Test the raw water and, where treatment is fitted, the treated water too.
• Re-test after any work on the well, pump or treatment system.
• Review results against the requirements for your province and water use.

General information only — not legal or regulatory advice. Testing rules vary by province and territory; confirm them with the authority for your area.