Industrial Water and Air Discharge Permits — City of Montréal and the CMM

The Regulatory Layer That Often Surprises Operators

Industrial facilities in the Communauté métropolitaine de Montréal (CMM) discharging to the municipal sewer system or emitting air contaminants operate under municipal by-laws that run parallel to provincial requirements. Compliance with MELCCFP does not substitute for municipal compliance, and the two processes are not coordinated — each must be navigated independently.

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The primary instrument governing industrial wastewater discharge in the CMM is Regulation 2008-47, which sets contaminant-specific discharge limits, defines monitoring obligations, and governs the permit application process. For air emissions, the Clean Air Regulation (Q-2, r. 4.1) establishes standards for particulate and gaseous emissions, opacity limits, and ambient air quality criteria applicable within the city.

 

Water Discharge Permits — What the Process Requires

A wastewater discharge permit application to the City of Montréal's Service de l'environnement requires a technically substantive submission: documented monitoring protocols for all wastewater-generating processes, source control device specifications, a technical report signed and sealed by a professional engineer, spill response measures, and a maintenance program for treatment infrastructure. Permit issuance typically takes up to 75 working days from a complete submission — incomplete or technically inadequate files restart that clock.

One critical operational point: the permit must be obtained before related work begins. Facilities that commence modifications to treatment systems or discharge configurations without a permit are operating in violation regardless of their intent to comply.

 

Air Discharge Permits — What the Process Requires

Air permit applications require cadastral property identification, engineering documentation of filtration and emission control systems, and an atmospheric dispersion modeling study — typically conducted using AERMOD — demonstrating that ground-level pollutant concentrations at receptors comply with applicable ambient air quality criteria. Post-permit, facilities may be subject to stack sampling requirements to verify ongoing compliance with permitted emission rates.

 

Working Knowledge of the Montréal Process

Municipal permit applications differ from provincial ones in tone and expectation. The City's reviewers are practically focused — they want to see that your treatment and control systems are adequately designed, properly maintained, and producing measurable results. We prepare applications that speak directly to those concerns, with technical documentation that anticipates reviewer questions rather than generating them.

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BIODE has direct working experience with Montréal's environmental permitting process across multiple industrial sectors, and maintains familiarity with the current interpretation of Regulation 2008-47 requirements as applied in practice — which sometimes differs from a strict reading of the text.