Every pressure washing job ends with dirty water on the ground, and that water is regulated in ways many homeowners never think about. It is also the question a property manager, an HOA board or a facilities buyer is most likely to ask before signing a contract, so it belongs in your marketing rather than buried in a quote.
It counts as industrial wastewater. Ohio EPA’s June 2025 guidance says wastewater generated by power washing is industrial wastewater, and that biodegradable soaps or detergents do not change that. Under the Clean Water Act a company cannot discharge it into waters of the state without a permit, and the agency says in capital letters that it cannot go into a storm sewer.
Local governments enforce it. Brookhaven, Georgia prohibits washwater discharge to its storm drainage system under federal stormwater rules (40 CFR 122.26), state rules and its own ordinance, with fines of up to $1,000 per violation per day and up to six months in jail. The city reports that pressure washing there has caused fish kills, advises against cleaners such as bleach, and says roof jobs may require vacuuming the washwater. Sacramento County lists pressure washing discharge among its common stormwater violations. Eugene, Oregon warns that even biodegradable or “nontoxic” cleaners can harm rivers.
What that means for the copy. “Eco-friendly” and “biodegradable” do not answer the runoff question, and on a commercial bid they can read as a sign the company has not thought about it. What does answer it is a plain description of what your crew does on site: covers the drain, recovers the water, and disposes of it where the local rules allow. PWNA’s Environmental EPA Training covers Clean Water Act compliance and teaches companies to document their environmental practices for commercial clients, municipalities and inspectors.
Roofs add a wrinkle. The ARMA bulletin suggests a solution of chlorine bleach, trisodium phosphate and water for lightening algae, while Brookhaven discourages bleach near storm drains. The way through is runoff control, and the way to sell it is to show it: a photo of the drain cover and the recovery hose beside the before-and-after.
We write that page with you, in your words and only about what your crews really do, and it becomes the document a commercial pitch rests on.