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Contractors Pollution Liability on a COI: When to Require It and How to Check It

By SubCover HQ · Updated Nov 3, 2026 · 3 min read

A plumber's leak turns into mold. A painter disturbs lead paint. An excavator hits an old fuel tank. Each of these can look like a routine general liability claim until the insurer points to the pollution exclusion. That's why many contractors and property managers require contractors pollution liability (CPL) from certain trades.

Why general liability usually isn't enough

Standard commercial general liability policies contain a broad pollution exclusion, and some policies add an even broader "total pollution" exclusion by endorsement. Depending on the wording and your state's case law, claims involving mold, fuel, chemicals, asbestos, lead, sewage, or contaminated soil may be excluded or disputed. A certificate showing $1M of general liability tells you nothing about whether those claims would be covered.

Trades where CPL is commonly required

• Abatement and environmental work: asbestos, lead, and mold remediation.
• Excavation and site work: digging near tanks, lines, or contaminated soil.
• Restoration: water, fire, and sewage cleanup, where mold is a known risk.
• Plumbing and HVAC: leaks, refrigerants, and fuel lines.
• Painting on older buildings: lead-based paint disturbance.
• Roofing, paving, and anyone handling fuels, solvents, or chemicals on site.

Our COI requirements by trade pages note where pollution coverage is commonly part of the conversation.

Where CPL shows up on an ACORD 25

The ACORD 25 has no dedicated pollution row. CPL usually appears in the blank "Other" row with its own insurer, policy number, dates, and limits, or it's referenced in the description of operations box. Sometimes pollution coverage is part of a combined policy, such as a package written for environmental contractors. If you see it only in the description box, with no policy number or limits, ask the agent to list it properly.

What to verify

1. It's actually there. A policy number, insurer, dates, and a limit, not just the word "pollution."
2. The limit meets your requirement. $1M per occurrence or claim is a common starting point for higher-risk trades; ask your insurance professional what fits your work.
3. Occurrence or claims-made. CPL is written both ways. If it's claims-made, note the retroactive date and ask about continued coverage after the job. Our claims-made vs. occurrence guide explains why that matters.
4. Additional insured and waiver, if your contract requires them. These need to apply to the CPL policy too, not just the general liability.
5. Mold isn't carved out. Some CPL policies limit or exclude mold. If mold is the main risk on your job, ask the agent to confirm in writing.

Write it into the contract

If CPL matters for a trade, put the requirement, limit, and endorsements in the subcontract or vendor agreement. Additional insured coverage often only applies when a written contract requires it. Our free insurance requirements generator gives you a starting list to take to your attorney.

Key takeaways

General liability limits don't answer the pollution question. Decide which trades need CPL, require it in writing, and check for a real policy line with dates and limits on every certificate. SubCover HQ checks for trade-specific coverage like CPL on every certificate we review, for $99/month.

Frequently asked questions

Does general liability cover pollution?

Usually not much. Standard general liability policies contain a pollution exclusion, and some add a broader total pollution exclusion. Coverage for mold, fuel, chemicals, or lead is often excluded or disputed.

Where is pollution coverage on an ACORD 25?

There's no dedicated row. It usually appears in the blank Other row with its own policy number, dates, and limits.

Which subs need contractors pollution liability?

Commonly abatement, excavation, restoration, plumbing, HVAC, painting on older buildings, and anyone handling fuels or chemicals. Your insurance professional can help set the list.

Is CPL claims-made or occurrence?

It's written both ways. If it's claims-made, check the retroactive date and how long the sub must keep coverage after the job.

This guide is general information, not insurance or legal advice. Policy wording varies; your insurance professional and attorney determine what you should require.