Do I need a permit to change drainage on my property?

Often yes if the change affects lot grading, directs runoff to the municipal storm system, or alters a watercourse; check City guidance and consult reviewers.

Who inspects stormwater controls?

Inspections are performed by City-appointed inspectors or by certified professionals as required by the permit conditions.

What if I get an order from the City?

Follow the order instructions, contact the issuing department for clarification, and ask about appeal routes or timelines shown on the order.

Toronto Stormwater Permit Steps - City Bylaw Guide

Environmental Protection Ontario 4 Minutes Read · published February 11, 2026

Toronto, Ontario property owners who alter drainage or manage runoff must follow municipal stormwater control requirements to protect public sewers, watercourses and downstream property. This guide explains typical permit steps, who enforces rules, inspection and complaint routes, and practical actions for homeowners, developers and contractors in Toronto. It summarizes application steps, common violations, and what to expect at each stage so you can prepare plans, submit forms, respond to inspections and, where necessary, appeal decisions.

What is a stormwater control permit and when is it required

A stormwater control permit on private property typically covers modifications that change lot grading, roof or driveway drainage, connection to municipal storm sewers, installation of stormwater management systems (e.g., rain gardens, retention/infiltration systems) or works in a watercourse. Requirements are driven by the City of Toronto engineering and stormwater policies and reviews during development or permit applications; check the City stormwater overview for guidance City of Toronto - Stormwater management^[1].

Steps to obtain a stormwater control permit

Pre-application review: confirm whether proposed works trigger stormwater requirements and what level of study or plan is needed.
Prepare documents: site plan, graded plan, stormwater management plan or drawings by a qualified professional where required.
Submit application: follow the City engineering or development submission process and attach required reports and drawings.
Technical review and revisions: City reviewers or Toronto Water may request clarifications or changes.
Permit issuance and conditions: once approved, the permit will include conditions for construction, inspection and post-construction certification.
Inspections and compliance: schedule required inspections and submit as-built documentation or certifications.
Long-term obligations: maintain stormwater measures and comply with any monitoring or maintenance plans attached to the permit.

Maintain documentation of approvals and inspections to avoid enforcement action.

Penalties & Enforcement

Enforcement of stormwater control and related bylaw requirements in Toronto is carried out by City enforcement branches in coordination with Toronto Water or Municipal Licensing & Standards, depending on the issue and location. For general stormwater policy and guidance see the City stormwater management page City of Toronto - Stormwater management^[1], and for bylaw enforcement and complaint procedures see Municipal Licensing & Standards Municipal Licensing & Standards^[2].

Fines and penalties:

Monetary fines: specific fine amounts for stormwater or bylaw breaches are not specified on the cited City stormwater pages; consult the enforcing bylaw or Provincial Offences documentation for exact schedules 311 Toronto^[3].
Continuing offences: escalation for ongoing non-compliance is not specified on the cited pages and may involve daily penalties or court orders depending on the instrument.
Non-monetary orders: the City may issue orders to stop work, require remediation, or require the installation/repair of controls; enforcement can include issuance of orders and potential prosecution.

Enforcer, inspections and complaints

Primary enforcers: Toronto Water for infrastructure/storm sewer matters and Municipal Licensing & Standards or local enforcement units for bylaw compliance.
How to report: file a service request or complaint via 311 Toronto for urgent drainage, flooding or suspected bylaw breaches 311 Toronto^[3].
Inspections: inspections are typically scheduled by the permit holder or triggered by a complaint; follow the permit conditions for required certification.

If you receive an order, follow the steps and timelines in the order to reduce escalation risk.

Appeals, review and time limits

Appeals: appeal routes depend on the specific bylaw or decision; some decisions may be appealed through internal review processes or to a tribunal/court under the Provincial Offences Act or applicable planning/building appeal routes.
Time limits: exact appeal deadlines and time limits are not specified on the cited stormwater overview and must be confirmed on the specific enforcement or permit decision documents.

Applications & Forms

Application forms, submission checklists and engineering requirements are published through City development and permit pages; some projects require a Professional Engineer or qualified consultant to submit stormwater management reports. Specific form names and fees are not consistently listed on the general stormwater overview and should be obtained from the relevant City division during pre-application review City of Toronto - Stormwater management^[1].

Common violations

Altering lot grading without approval.
Unpermitted connection to municipal storm sewers.
Failure to install or maintain required stormwater controls (e.g., infiltration beds, swales).
Not providing as-built drawings or certifications after construction.

Early consultation with City reviewers reduces redesign and enforcement risk.

FAQ

Do I need a permit to change drainage on my property?: Often yes if the change affects lot grading, directs runoff to the municipal storm system, or alters a watercourse; check City guidance and consult reviewers.
Who inspects stormwater controls?: Inspections are performed by City-appointed inspectors or by certified professionals as required by the permit conditions.
What if I get an order from the City?: Follow the order instructions, contact the issuing department for clarification, and ask about appeal routes or timelines shown on the order.

How-To

Confirm whether proposed works trigger stormwater control requirements by consulting City stormwater guidance and pre-application reviewers.
Hire a qualified professional to prepare required site and stormwater management plans.
Submit the application and supporting documents through the City development or permit portal as instructed.
Respond to reviewer comments, revise designs, and obtain the permit with its conditions.
Complete construction, schedule inspections, and submit as-built documentation to close the permit.

Key Takeaways

Consult City reviewers early to identify permit and study requirements.
Prepare professional plans and keep inspection records to avoid enforcement.
Use 311 or the enforcing City division for complaints, inspections and order clarification.