Effluent testing and reporting amendments

Summary#

These are final amendments registered as SOR/2026-107 and published in the Canada Gazette on June 17, 2026 (registration date June 4, 2026). They change three Fisheries Act regulations: the Metal and Diamond Mining Effluent Regulations, the Pulp and Paper Effluent Regulations, and the Wastewater Systems Effluent Regulations. The key practical effects are: temporarily changing how one marine toxicity test is treated for mines, adding a new algae test option for mills and mines, and fixing wording, reporting, and administrative issues.

What it does#

• Metal and Diamond Mining Effluent Regulations (MDMER)

  • Removes the requirement to pass the Acartia tonsa acute lethality test as a condition to keep discharge authority for a period of 10 years.
  • Mines still must run the Acartia tonsa test once per month and report results; test results during this period are used for monitoring and data collection, not for compliance enforcement.
  • The monthly testing requirement cannot be reduced during this period. After the 10-year period, passing the test will again be required.

• Pulp and Paper Effluent Regulations (PPER) and MDMER

  • Add by reference a new sublethal toxicity test: the "Canadian add‑on procedure to ISO 10710" using the macroalga Ceramium tenuicorne.
  • This gives mills and mines another, Canada-friendly test option that can be run by domestic labs.

• Wastewater Systems Effluent Regulations (WSER) and MDMER — administrative and clarity fixes

  • Add a definition of “operator” for WSER to match other Fisheries Act rules.
  • Clarify temporary bypass authorizations (dates, locations, duration, volume, and mitigation/monitoring conditions).
  • Require electronic submission of reports in the Department’s formats (for example, through Mine Effluent Reporting System), and broaden who can be notified (inspector, fishery officer, or other prescribed authority).
  • Fix several French/English wording mismatches and correct small timing and reporting clauses (for example, some reports or notices must be filed within 30 days or emergency plans completed within 60 days where the rules specify those time frames).
  • A few minor technical edits to sampling, detection-limit handling, and study triggers in MDMER are also made.

• Timing

  • Most amendments come into force on the registration date (June 4, 2026). Two specific repeals become effective on the 10th anniversary of that registration date.

Who's affected#

• Mines that discharge to estuarine or marine waters, especially the two Nunavut sites currently subject to the Acartia tonsa requirement: Meliadine and Hope Bay (owned by Agnico Eagle Mines).
• Pulp and paper mills required to do sublethal algae testing.
• Owners and operators of municipal wastewater systems covered by the Wastewater Systems Effluent Regulations.
• Commercial laboratories that do effluent toxicity testing (the new algae test is intended to be runnable in Canadian labs).
• Local and Indigenous organizations and governments in affected regions, including the Kivalliq Inuit Association and Kitikmeot Inuit Association, and the Government of Nunavut — they were consulted and discussed regional concerns.
• Environment and Climate Change Canada will manage reporting and oversight under the Fisheries Act.

If you live near an affected mine or wastewater system, or work in those sectors, you'll be the most likely to notice changes in monitoring, reporting, or testing options.

Why it matters#

• For mines in Nunavut, the change gives short-term regulatory certainty for operations and investment planning by turning the Acartia tonsa test into a monitoring requirement for 10 years rather than a pass/fail compliance test. That can ease operational uncertainty while more data are collected.
• Turning the Acartia tonsa requirement into monitoring-only raises the prospect of more test failures not triggering immediate regulatory action. The government says other limits and tests remain in force to protect the environment.
• Adding the Ceramium tenuicorne test restores a Canadian testing option for mills and mines, which should make compliance easier and cheaper and support domestic lab work.
• The administrative fixes (clearer reporting channels, matched English/French wording, clearer authorization conditions) aim to reduce confusion, make enforcement more consistent, and let regulated parties use one‑window electronic reporting systems.
• Because the changes specifically affect two Nunavut mines and regional Indigenous groups were consulted, there are local social and environmental stakes; monitoring continues and the pass requirement returns after 10 years, so this is framed as a temporary approach to build evidence.