Pressure washing looks low-risk until the water goes where it should not.

Under the Clean Water Act, wash water carrying detergents, oil, and debris is treated as a pollutant that generally cannot be discharged into storm drains, and local governments enforce it (U.S. EPA, NPDES). Standard general liability commonly excludes pollution, which is why runoff sits outside a base policy.

Why the real risk is water, not the wand

Pressure washing is one of the cheaper trades to insure at the ground level, and that leads a lot of operators to buy the first cheap policy and move on. The trouble is that the trade's actual claims are not about the equipment. They are about where the water ends up. High pressure can drive water behind siding and into window and door assemblies, where it causes interior damage that surfaces days later. It can etch concrete, strip coatings, and break seals. And the runoff carries detergents and contaminants that the law does not let you send into a storm drain.

Your crew is rated for workers comp under class code 9014 for ground-level work. If you also wash roofs or work at height, some payroll can pull a higher-rated code, so the classification should follow the actual work.

What each coverage actually does for you

General liability is the base, and it responds to sudden accidental damage to a third party's property, water forced into a building, a neighboring surface damaged by overspray. Workers compensation covers crew injuries, including the slip and high-pressure exposure, once you have employees. Commercial auto covers the rig, tank, and trailer.

Tools and equipment protects the pressure units, hoses, surface cleaners, and reclaim gear. Pollution liability covers the wash-water runoff that standard general liability excludes, which is the coverage most pressure washers do not know they are missing. An umbrella adds limit for the larger commercial and property-management contracts that come with higher requirements.

Wash-water runoff, and the EPA problem

Here is the exposure most operators overlook. When you clean a parking lot, a storefront, or a fleet, the water that runs off carries soap, oil, grease, and debris. Under the Clean Water Act, that runoff is a pollutant, and discharging it into a storm drain can bring a municipal fine or a cleanup order. Because standard general liability commonly excludes pollution, a runoff claim or fine can land entirely outside your base policy.

Two things solve it together: containment and reclaim practices on the job that keep runoff out of the drain, and pollution coverage that responds if something gets away from you. On commercial and municipal work, both are increasingly expected.

What it costs, and what moves the number

Pressure washing prices lower than most trades at the ground level, so treat any single figure with caution. As a reference point, a small pressure washing business often sees general liability from about $500 to $1,500 a year, with workers comp added once you have employees on class code 9014. Your own number depends on real details:

• Ground versus roof and height work. Roof and building washing raises the exposure and can pull a higher class code.
• Commercial and fleet work. Larger contracts and runoff exposure raise the number.
• Pollution coverage. Adding runoff coverage adds premium, and it is worth it on commercial work.
• Payroll. Workers comp is a rate on 9014 payroll once you have employees.
• Loss history. Prior property-damage claims follow you into renewal.

The exclusions that get pressure-washing claims denied

The honest downside a brochure skips:

• Pollution. Wash-water runoff is commonly excluded from base general liability.
• Care, custody, and control. Damage to the specific surface you were hired to clean may not be covered.
• Height and roof work. If you wash roofs, a ground-level policy may not contemplate that exposure.
• Faulty work. Redoing a cleaning you damaged is not a liability claim; the resulting third-party damage may be.

Licensing and standards, by state

Requirements vary across the western states we serve, so confirm yours rather than assuming. Many states do not require a specific contractor license for exterior pressure washing, though a local business license is usually needed, and roof or building washing tied to other trades can trigger licensing. What is more consistent is the stormwater and runoff rules under the Clean Water Act, enforced locally. Your state page below can help you confirm both.

How a market check usually plays out

Pressure washing is easy to insure cheaply and easy to insure badly. Plenty of operators carry a bare policy that excludes runoff and limits property damage, and never know until a claim. The value of a real market check is matching the policy to what you actually do, ground versus roof, residential versus commercial, and adding pollution coverage where the work calls for it.

Questions to ask before you buy a pressure-washing policy

• Does my general liability cover water forced into a building or damage to a neighboring surface?
• Is wash-water runoff excluded, and do I need pollution coverage for commercial work?
• If I wash roofs or work at height, does my policy and class code reflect that?
• Does care, custody, and control leave the surface I was cleaning uncovered?
• Do my commercial contracts require limits or additional-insured status I do not carry?