What environmental rules apply to pressure washing runoff in Ottawa?

Pressure washing runoff deserves more thought than most people give it, because storm drains generally carry water toward local creeks and rivers rather than to a treatment plant. Anything washed off your surfaces during pressure washing — construction sediment, chemical cleaners, paint residue, or oil — can end up in the local watershed.

What to Know About Pressure Washing Runoff

The City of Ottawa has rules about what may be discharged into its sewers, and provincial environmental law also protects water quality. This answer can't give you the exact wording or how it applies to your job, so if you have a specific question — for example, about using a chemical cleaner or washing a large commercial surface — check with the City before the work starts. As a practical matter, plan for wash water that carries anything other than plain dirt to stay out of the storm drain.

For post-construction pressure washing, the biggest everyday concern is sediment. Construction leaves behind fine dust and grit, including concrete dust, mortar, drywall compound, and clay-heavy mud. When this material is washed into storm drains, it adds sediment to the water downstream. Careful cleaning crews deal with this using measures such as filter socks around storm drain inlets, berms that redirect runoff onto lawn or soil where it can soak in, and in some cases equipment that vacuums up wash water for proper disposal.

Chemical runoff is the other concern. If the job involves degreasers, concrete cleaners, rust removers, or any other chemical product, ask how the crew will keep that runoff out of the storm drain and how they will dispose of it. Ask whether the products they use are biodegradable and phosphate-free, and read the product label's own disposal directions.

If you are hiring a company for post-construction pressure washing, ask specifically about its runoff plan. A careful crew will be able to explain how it contains and manages wash water. Ask for proof of liability insurance and what it covers, and ask whether they have WSIB coverage or a clearance certificate. Larger commercial projects can come with their own site requirements, so the property manager or general contractor should confirm those. The Ottawa Construction Network directory at justynrookcontracting.com can help you find independent cleaning companies for post-construction work.

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