Storage Tank & Environmental Liability Insurance Insurance — Your Questions Answered
Quick Answer
Common questions about Storage Tank & Environmental Liability Insurance — what it covers, costs, exclusions, and requirements explained by licensed insurance a…
Storage tank insurance and environmental liability coverage protects businesses from the costs of underground and aboveground storage tank leaks, spills, and contamination — including cleanup costs, third-party bodily injury, property damage, and regulatory response.
Quick Summary
Underground storage tank (UST) insurance is required by federal EPA regulations for most UST operators. It covers corrective action (site cleanup), third-party bodily injury and property damage from releases, and legal defense costs. Environmental liability insurance (also called pollution liability) extends coverage to aboveground spills, gradual contamination, and site remediation. Coverage is critical for gas stations, fuel distributors, industrial facilities, and any business with fuel or chemical storage.
Is underground storage tank insurance required by law?
Yes. Federal EPA regulations (40 CFR Part 280) require that UST owners and operators demonstrate financial responsibility for corrective action and third-party liability. The required amount is $1M per occurrence / $2M aggregate for petroleum USTs. Financial responsibility can be demonstrated through: insurance, self-insurance (net worth test), guarantee, letter of credit, surety bond, state fund, or trust fund. Insurance is the most common mechanism. Many states have additional requirements beyond the federal minimum.
What does UST/storage tank insurance cover?
Storage tank insurance typically covers: (1) Corrective Action — cleanup costs for soil and groundwater contamination from a tank release; (2) Third-Party Bodily Injury — medical expenses and damages for people affected by a release (contaminated drinking water, vapor intrusion); (3) Third-Party Property Damage — damage to neighboring properties from contamination; (4) Legal Defense Costs — regulatory enforcement proceedings and civil lawsuits; (5) Emergency Response — immediate response costs to stop a release in progress. Policies are typically written on a claims-made basis.
What is the difference between UST insurance and pollution liability insurance?
UST insurance specifically covers releases from underground storage tanks — primarily petroleum products like gasoline and diesel. Pollution liability insurance (environmental liability) is broader and covers: surface spills, aboveground storage tank (AST) releases, contamination from industrial operations, asbestos and lead paint disturbance, and other pollutant releases. Many businesses need both or a combined environmental program that covers all storage tank and pollution exposures. A gas station with both underground fuel tanks and an aboveground used oil tank needs coverage for both.
What are the most common UST claim scenarios?
Common UST claims include: (1) Piping leaks — corroded or improperly installed piping is the most common source of UST releases; (2) Overfills — product overflow during delivery; (3) Spills — small product releases at fill ports; (4) Corrosion failures — in steel tanks without cathodic protection; (5) Component failures — sensors, sump pumps, and dispensers. Third-party claims most commonly involve: neighboring wells contaminated by petroleum hydrocarbon migration, vapor intrusion into nearby buildings, and product loss recovery claims.
What state UST programs exist in California?
California has the State Water Resources Control Board (SWRCB) Underground Storage Tank Program, one of the most stringent in the nation. California requires: secondary containment (double-walled tanks and piping), electronic monitoring systems, and regular inspection. California also has the LUST Cleanup Fund — a state cleanup fund for UST releases — but operators must still demonstrate insurance or other financial responsibility under both state and federal requirements. The Unified Program Agencies (UPAs) in each county administer local UST permitting and compliance.
Do I need environmental insurance for aboveground storage tanks?
Yes — ASTs (aboveground storage tanks) have their own insurance requirements. Spill Prevention, Control, and Countermeasure (SPCC) plans are required by EPA for facilities with AST oil storage above certain thresholds. AST spills can be large-volume events (a rupture of a 10,000-gallon AST can contaminate a large area quickly) and cleanup costs can reach hundreds of thousands or millions of dollars. Standard GL policies exclude pollution — a dedicated pollution liability or storage tank policy is needed for AST exposure.