Maintenance Rules for Ontario Municipal Drains

Summary#

The final regulation Maintenance and Repair of Ontario Municipal Drains Regulations creates a set of clear rules that let Ontario municipalities carry out certain routine drain maintenance without a project-specific review under the Fisheries Act. It replaces the old class authorization steps and takes effect on registration (May 25, 2026).

What it does#

• Defines which routine works on municipal drains are automatically allowed when conditions are met. The rules cover three drain classes (those called class C, class E1 and class E2) and unrated sections immediately upstream of those classes.
• Allows common activities such as removing accumulated sediment and aquatic vegetation (bottom cleanouts). For example:
  • For class C: full bottom cleanouts, and (if needed) removal of riparian vegetation on one or both banks.
  • For class E1: full bottom cleanouts, and limited bank vegetation removal only on one bank while trying to keep shade-providing vegetation.
  • For class E2: only half the aquatic vegetation may be removed (either by cleaning half the channel width or by a staged pattern along the channel), and limited bank vegetation removal on one bank while keeping shade where possible.
• Sets limits to protect habitat:
  • Removing gravel from the drain bottom is prohibited for class E1 and class E2 segments.
  • If a staged cleanout is used on a class E2 segment, no further cleanout is allowed on that segment for 1 year after completion.
• Makes the rules apply only when carried out by the responsible local government: Ontario municipalities that manage drains under Ontario’s Drainage Act.
• Requires notifications and documentation to Fisheries and Oceans Canada (DFO):
  • A pre-project notice at least 10 days before starting work, including location, drain classification, a description of the planned work, and date-stamped photos taken in ice- and snow-free conditions.
  • A post-project notice within 120 days after completion confirming what was done, approximate locations of any refugia pools, and matching date-stamped photos.
• Requires sediment and erosion controls and other habitat-protection steps, for example:
  • A sediment and erosion control plan and keeping controls in place until sites stabilize.
  • Dispose of excavated material above the ordinary high water mark.
  • Install at least one refugia pool for each 500 metres of drain cleaned (no refugia pool required if the total cleanout length is less than 500 metres).
  • Revegetate exposed banks with deep-rooted native species.
• Blocks work during fish-sensitive times:
  • In the northern region described in the rules: no work from April 1 to July 15 each year.
  • In the southern region (zone 15 and south): no work from March 15 to July 15 each year.

Who's affected#

• Primary: Ontario municipalities responsible for maintaining municipal drains and their drainage superintendents. They must follow the new notification, documentation, and mitigation rules.
• Nearby land users such as farmers and property owners who rely on drains for field drainage and flood control may notice faster or more predictable maintenance work.
• Fisheries and Oceans Canada (DFO) staff will handle notifications and use the information for monitoring and compliance instead of issuing many individual authorizations.
• Conservation authorities and local environmental groups may be involved in or watch maintenance work.
• Small businesses are not expected to be affected.

Why it matters#

• It speeds up and simplifies routine drain maintenance by removing the need for a separate Fisheries Act review when the rules are followed. That can help municipalities fix drains faster for flood control and agriculture.
• At the same time, the regulation sets specific, enforceable steps (timing windows, sediment controls, refugia pools, limits on gravel and vegetation removal) intended to reduce harm to fish and fish habitat.
• The change makes the process more predictable and reduces administrative work for both municipalities and DFO, while keeping legal, photo-based records for oversight.
• If anything in these rules is unclear for a particular drain or project, the source document recommends contacting DFO; the regulation itself sets the mandatory conditions and penalties for non-compliance.