What insurance does a pressure washing business need?

Most pressure washing businesses need commercial general liability for injury and property damage, pollution liability for wash water and chemical runoff, a tools and equipment floater for washers and trailers, and commercial auto for the truck and towed rig. Employers need workers' compensation where required. Fleet washers also need cover for the client vehicles in their care.

Is damage to the surface I am cleaning covered?

Often not by a standard policy. Canadian general liability wordings usually exclude property in your care, custody or control and the part of property you are working on. A furred deck or stripped siding can fall inside those exclusions. Ask your broker whether an endorsement is available, and use test patches, photos and signed work orders.

What if water gets inside the building while I am washing?

Interior damage beyond the surface you were working on is usually a general liability claim, subject to the policy's wording on water damage. Water forced behind siding, around windows or under doors is a common loss. Check the wording before you buy, close windows and vents, and avoid aiming high pressure at seams, flashings and frames.

Do I need pollution insurance for pressure washing?

If you use detergents, degreasers or soft-wash chemicals, or wash commercial sites, you should consider it. Most general liability policies exclude pollution or cover only sudden and accidental events. Pollution liability pays clean-up costs and third-party claims after runoff reaches a drain, creek or neighbouring property. Some commercial clients require it in their contracts.

Can I let wash water go down the storm drain?

Usually not if it carries detergent, oil, paint or debris. The federal Fisheries Act bars depositing deleterious substances where they may enter fish-bearing water, and Ontario's Water Resources Act bars discharges that may impair water quality. Municipal sewer-use by-laws add limits; Ottawa's bars storm discharges with a visible sheen, over 40°C, or outside pH 6.0 to 9.0.

Are my pressure washer and trailer covered if they are stolen?

The equipment is covered if it is scheduled on a tools and equipment floater with theft cover, including theft from trailers and vehicles. The trailer itself needs to be declared on your commercial auto policy for liability on the road, and can be insured for physical damage there or on the floater. Insure the full rig at replacement value.

Does my insurance cover vehicles I wash for fleet clients?

Not always. Vehicles you are washing are in your care, custody or control, which standard general liability excludes. Fleet and equipment washers should ask for a customers' property or similar extension that covers damage to client vehicles during the work. Confirm the limit matches the value of the vehicles you handle at one time.

Do pressure washing businesses need WSIB coverage in Ontario?

If you have employees, the WSIB requires most Ontario businesses to register within 10 calendar days of hiring their first worker, and seasonal crews count. Ask the WSIB to confirm how your work is classified, especially if you also paint, seal or restore surfaces. Commercial clients may ask for a clearance certificate before you start work.

How is pressure washing insurance priced?

Underwriters rate revenue and payroll, your residential and commercial mix, the services you offer such as roof cleaning, graffiti removal and fleet washing, how you handle chemicals and wash water, working height, equipment values and claims history. Recovery systems, written procedures and photos of every job help. Higher limits and pollution cover add premium.

Construction & Trades

Pressure Washing Insurance in Canada

Insurance for the siding that strips, the water that gets inside and the runoff that reaches the drain.

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In short

A pressure washing business in Canada needs commercial general liability for injury and property damage on client sites, checked for how it treats damage to the surface you are cleaning. Add pollution liability for detergent and wash water runoff, tools and equipment cover for washers, surface cleaners and trailers, commercial auto for the truck and towed rig, and workers' compensation where your province requires it.

Last reviewed October 27, 2026

Maximum temperature for matter discharged to a storm sewer in Ottawa (Sewer Use By-law 2025-94, s. 7): 40°C; Maximum temperature for matter discharged to a storm sewer in Ottawa (Sewer Use By-law 2025-94, s. 7)
pH range allowed for discharges to an Ottawa storm sewer or watercourse (By-law 2025-94, s. 7): 6.0 to 9.0; pH range allowed for discharges to an Ottawa storm sewer or watercourse (By-law 2025-94, s. 7)
Fall in overall Canadian commercial insurance rates, Q3 2026 (Marsh Global Insurance Market Index): 6%; Fall in overall Canadian commercial insurance rates, Q3 2026 (Marsh Global Insurance Market Index)
Canadian insurers we compare for exterior cleaning and pressure washing risks: 17; Canadian insurers we compare for exterior cleaning and pressure washing risks

Pressure washing claims come from the surfaces you clean, the water you push and the chemicals you rinse away. Stripped siding, furred decks, water behind window frames and slips on wet walkways are routine, and how your general liability policy treats damage to the surface you were hired to clean decides who pays. We pair it with pollution cover for wash water and a tools and equipment floater for your rig.

We also cover the truck and towed trailer on commercial auto, sort out WSIB for seasonal crews, and issue certificates that property managers and fleet clients ask for. See the construction and contractors guide for the sector view, and our window cleaning page if you offer both.

What the package includes

Commercial general liability for injury and property damage on client sites
Endorsements that address damage to the surface you clean, where available
Pollution liability for detergent, degreaser and wash water runoff
Tools and equipment floater for washers, hot water units, surface cleaners and tanks
Commercial auto for the truck and the towed washing rig
Customers' property cover for fleet and equipment washing
Employers' liability for seasonal crews

Why pressure washing creates claims

Pressure washing looks simple until thousands of PSI meet the wrong surface. Stripped paint, furred cedar, etched glass, blown-out mortar joints and water forced behind siding or window frames are the everyday losses. Then the water has to go somewhere. Wash water carrying detergent, degreaser, oil or paint chips that runs into a storm drain is a pollution problem, not just a mess.

The work also creates slip hazards on wet walkways, overspray on parked cars, and ladder and roof exposures for soft washing. A good program answers each of those, and it starts with knowing exactly what your liability policy does and does not cover on the surface you were hired to clean. Exterior cleaning sits inside our construction and contractors sector, alongside trades like window cleaning.

The coverages a pressure washing business needs, and why

A typical program has five or six parts. The two that need the most attention are the liability wording for the property you work on and the pollution cover.

Core coverages for a pressure washing business
Coverage	What it answers	Points to check
Commercial general liability (CGL)	Injury to the public and damage to client or neighbour property	How the care, custody or control and work-in-progress exclusions apply; see commercial general liability
Pollution liability	Clean-up and third-party claims from detergent, chemical or contaminated wash water runoff	Most CGL policies exclude pollution or limit it to sudden and accidental events
Tools and equipment floater	Theft or damage to washers, hot water units, surface cleaners, hose reels and water tanks	Theft from trailers, scheduled values; see tools and equipment
Commercial auto	The truck and the towed rig on the road	Trailer declared, weight with a full water tank; see commercial auto
Employers' liability	Injury suits from workers not barred by workers' compensation	Seasonal staff; see employer liability
Customers' property extension	Damage to vehicles or equipment you clean, such as fleet trucks	Needed for fleet and equipment washing, where the client's property is in your care

Damage to the surface you are cleaning

This is where most pressure washing disputes start. Standard Canadian CGL wordings, such as the IBC 2100-style form, exclude damage to property in your care, custody or control, and to the particular part of real property you are working on when the damage arises out of your work. The deck board you furred or the siding you stripped can fall squarely inside those exclusions.

What usually remains covered is damage beyond the part you were working on. Water forced behind the siding that ruins drywall inside, overspray that marks a neighbour's car, or a chemical that kills the client's garden are the CGL's job. Because the line is fine, ask your broker three questions before you buy:

How does this policy treat damage to the surface I am hired to clean, and is there an endorsement that adds limited cover for it?
Is water damage inside a building, caused by exterior washing, covered or excluded?
Is damage to vehicles I wash covered, or do I need a separate customers' property extension?

Your best protection is still a test patch, pre-job photos and a signed work order that names the surfaces, the method and any existing damage. Our guide to reading your CGL policy explains how these business-risk exclusions work.

The claims that actually happen

The scenarios below are hypothetical, but they reflect the losses underwriters ask about on exterior cleaning applications.

Hypothetical pressure washing claims and the policy that responds
Hypothetical scenario	What went wrong	Policy that responds
Water forced behind vinyl siding soaks insulation and interior drywall	Damage beyond the surface being cleaned	Usually CGL, subject to water damage wording
Cedar deck boards are furred and need sanding and re-staining	Damage to the surface you were working on	Often excluded; covered only if the policy is endorsed
Degreaser from a parking garage wash enters a storm drain and reaches a creek	Pollution and clean-up costs	Pollution liability; usually excluded on a basic CGL
A tenant slips on a walkway left wet and icy after an autumn wash	Bodily injury to the public	CGL
Soft-wash solution drifts onto a neighbour's car and garden	Third-party property damage	CGL, or pollution liability depending on the wording
The washer trailer is stolen from a driveway overnight	Theft of owned equipment	Tools and equipment floater for the gear; auto for the trailer

Wash water, chemical runoff and the law

Wash water is regulated at three levels. Each can lead to fines and clean-up orders that a basic liability policy will not pay.

Federal. Section 36(3) of the Fisheries Act prohibits depositing a deleterious substance in water frequented by fish, or anywhere it may enter that water. A storm drain often leads straight to a creek or river.
Ontario. Section 30 of the Ontario Water Resources Act makes it an offence to discharge any material into water, or into any place, that may impair water quality. If material escapes outside the normal course of events, you must notify the Ministry immediately. Other provinces have their own environmental statutes; check with the provincial ministry where you work.
Municipal. Sewer-use by-laws set what may enter storm and sanitary sewers. In Ottawa, section 7 of Sewer Use By-law 2025-94 bars discharging matter to a storm sewer or watercourse that has a visible film, sheen or discolouration, separates into two or more layers, is hotter than 40°C, or has a pH below 6.0 or above 9.0, and bars prohibited materials. Hot-water washing with detergent can fail several of those tests at once. Check the by-law in every municipality you work in.

Practical controls reduce both the legal risk and the premium: drain covers and berms, vacuum recovery for degreasing and commercial work, biodegradable detergents used at label rates, and written disposal methods. Pollution liability pays clean-up and third-party claims after a spill. It does not make an unlawful discharge lawful.

Water use, heights and equipment

Most residential jobs run off the client's tap. Agree in writing who supplies water and power, and what happens if an outdoor tap is damaged or left running. If you draw from a hydrant or another public source, get the municipality's permission first; a by-law fine is not insurable.

Roof washing, soft washing of upper storeys and gutter cleaning put workers on ladders, roofs and lifts. Follow your province's occupational health and safety rules for fall protection, and tell your insurer the maximum height you work at. Some insurers restrict roof work or work above a set height.

Hot water units have burners and fuel. Fuel spills, burns and fires in a garage or trailer are possible, so declare them. A water tank adds a lot of weight to a trailer; confirm your truck, hitch and auto policy are set up for the loaded weight.

Fleet washing, graffiti removal and add-on services

Many washing businesses grow by adding services. Each one changes the risk, so each one needs to be on the application.

Fleet and equipment washing. You work on the client's lot, on vehicles worth far more than a deck. Those vehicles are personal property in your care, custody or control, which a standard CGL excludes, so ask for a customers' property extension with a limit that matches the most valuable units you wash at once.
Graffiti removal. Strippers and solvents used on masonry, concrete and painted surfaces bring chemical, runoff and surface damage exposure. Heritage and natural stone are easy to scar. Test first and record the method.
Sealing, staining and painting. Once you apply a coating, you are a finishing trade with completed operations exposure. A sealer that fails or stains a driveway can produce a claim months later.
Window, gutter and solar panel cleaning. These add ladder and roof work. If they are a large part of your business, see our window cleaning guide.
Winter work. If you plow or salt in the off-season, declare it separately. Our snow removal guide explains why.

Workers' compensation, contracts and certificates

In Ontario, the WSIB requires most businesses with employees to register within 10 calendar days of hiring their first worker. Ask the WSIB to confirm how your work is classified, especially if you also do painting, sealing or restoration. Outside Ontario, check your provincial board's rules. Our post WSIB is not enough explains why employers' liability still matters.

Property managers, condo corporations, municipalities and fleet operators will ask for proof before you start.

A certificate of insurance showing CGL limits and policy dates, often naming the client as an additional insured.
Limits of $2 million or $5 million per occurrence are common requests for commercial and municipal work.
Some contracts ask for pollution liability, a waiver of subrogation or 30 days' notice of cancellation. These must be added by endorsement, not just shown on a certificate.
If you subcontract crews in peak season, collect their certificates first. Our post on why contracts ask for a certificate explains each request.

What pressure washing insurance costs: the rating logic

Pressure washing is usually rated as a modest-hazard trade, but the details move the price.

What drives a pressure washing premium
Factor	Why it matters
Revenue and payroll	The base for CGL and employers' liability
Residential vs commercial	Commercial parking garages, restaurants and industrial sites bring degreasing and runoff exposure
Services offered	Soft washing, roof cleaning, graffiti removal, fleet washing and sealing are each rated differently
Chemicals and wash water handling	Recovery systems and written disposal methods reduce pollution risk
Working height	Roof and upper-storey work is rated above ground-level washing
Equipment, trailers and vehicles	Scheduled values and the towed rig
Claims history	Past surface damage and water intrusion claims weigh heavily

The market is favourable for buyers. Marsh's Global Insurance Market Index put overall Canadian commercial insurance rates down 6% in the third quarter of 2026. That makes renewal a good time to add pollution cover or fix the surface damage wording rather than just accept last year's policy.

How we build a pressure washing insurance program

1Map the work: house washing, decks and fences, commercial flatwork, parking garages, fleet, graffiti and roof cleaning, each with its share of revenue.
2Check the wording: we confirm how the CGL treats damage to the surface you clean, interior water damage and vehicles in your care, and add endorsements where they exist.
3Close the pollution gap: we arrange pollution liability sized to your chemicals and the clients who ask for it.
4Schedule the rig: washers, hot water units, surface cleaners, tanks and trailers at replacement value, with the trailer on your auto policy.
5Market it: we take the submission to the insurers on our panel of 17 whose appetite fits exterior cleaning and compare wordings, not just price.
6Stay current: we issue certificates as contracts arrive and update the policy when you add services such as roof cleaning or sealing.

Good to know

Frequently asked questions

What insurance does a pressure washing business need?: Most pressure washing businesses need commercial general liability for injury and property damage, pollution liability for wash water and chemical runoff, a tools and equipment floater for washers and trailers, and commercial auto for the truck and towed rig. Employers need workers' compensation where required. Fleet washers also need cover for the client vehicles in their care.
Is damage to the surface I am cleaning covered?: Often not by a standard policy. Canadian general liability wordings usually exclude property in your care, custody or control and the part of property you are working on. A furred deck or stripped siding can fall inside those exclusions. Ask your broker whether an endorsement is available, and use test patches, photos and signed work orders.
What if water gets inside the building while I am washing?: Interior damage beyond the surface you were working on is usually a general liability claim, subject to the policy's wording on water damage. Water forced behind siding, around windows or under doors is a common loss. Check the wording before you buy, close windows and vents, and avoid aiming high pressure at seams, flashings and frames.
Do I need pollution insurance for pressure washing?: If you use detergents, degreasers or soft-wash chemicals, or wash commercial sites, you should consider it. Most general liability policies exclude pollution or cover only sudden and accidental events. Pollution liability pays clean-up costs and third-party claims after runoff reaches a drain, creek or neighbouring property. Some commercial clients require it in their contracts.
Can I let wash water go down the storm drain?: Usually not if it carries detergent, oil, paint or debris. The federal Fisheries Act bars depositing deleterious substances where they may enter fish-bearing water, and Ontario's Water Resources Act bars discharges that may impair water quality. Municipal sewer-use by-laws add limits; Ottawa's bars storm discharges with a visible sheen, over 40°C, or outside pH 6.0 to 9.0.
Are my pressure washer and trailer covered if they are stolen?: The equipment is covered if it is scheduled on a tools and equipment floater with theft cover, including theft from trailers and vehicles. The trailer itself needs to be declared on your commercial auto policy for liability on the road, and can be insured for physical damage there or on the floater. Insure the full rig at replacement value.
Does my insurance cover vehicles I wash for fleet clients?: Not always. Vehicles you are washing are in your care, custody or control, which standard general liability excludes. Fleet and equipment washers should ask for a customers' property or similar extension that covers damage to client vehicles during the work. Confirm the limit matches the value of the vehicles you handle at one time.
Do pressure washing businesses need WSIB coverage in Ontario?: If you have employees, the WSIB requires most Ontario businesses to register within 10 calendar days of hiring their first worker, and seasonal crews count. Ask the WSIB to confirm how your work is classified, especially if you also paint, seal or restore surfaces. Commercial clients may ask for a clearance certificate before you start work.
How is pressure washing insurance priced?: Underwriters rate revenue and payroll, your residential and commercial mix, the services you offer such as roof cleaning, graffiti removal and fleet washing, how you handle chemicals and wash water, working height, equipment values and claims history. Recovery systems, written procedures and photos of every job help. Higher limits and pollution cover add premium.

Sources

Fisheries Act, R.S.C. 1985, c. F-14, s. 36(3) (deposit of deleterious substance prohibited). Government of Canada, Justice Laws, Current consolidation, accessed October 27, 2026.
Ontario Water Resources Act, R.S.O. 1990, c. O.40, s. 30 (discharge of polluting material; duty to notify). Government of Ontario, e-Laws (official Word consolidation), Consolidation from November 27, 2025, accessed October 27, 2026.
Sewer Use By-law (By-law No. 2025-94), s. 7, storm sewer requirements. City of Ottawa, In force July 1, 2025, accessed October 27, 2026.
Commercial General Liability Policy, specimen form PM-GL-2100 (coverages A to D, limits, conditions, definitions). Premier Group, Revised August 25, 2005.
Do you need to register with us?. Workplace Safety and Insurance Board (WSIB), Accessed October 26, 2026.
Canada commercial insurance rates fall for third straight year (Marsh Global Insurance Market Index, Q3 2026). Insurance Business Canada, October 21, 2026.

This page is general information, not insurance or legal advice. Coverage depends on your policy wording and the insurer. Speak with a licensed broker about your situation.

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