Underground Tank Cleanups: $2.2 Billion Cost
Data source: ZipCheckup analysis of EPA UST/LUST database and EJScreen proximity indicators
Every leaking underground storage tank tells the same story: fuel seeps silently into soil for months or years, contaminates the groundwater, and then someone gets a cleanup bill that starts at six figures.
The EPA currently tracks 43,801 open LUST cases — leaking underground storage tanks where contamination hasn't been fully resolved. Each one is an ongoing environmental and financial liability.
ZipCheckup mapped all of them to your ZIP code.
The Cleanup Math
The economics of UST remediation are brutal:
| Cleanup Stage | Typical Cost | Timeline |
|---|---|---|
| Initial assessment | $15,000 - $40,000 | 3-6 months |
| Soil excavation | $50,000 - $150,000 | 6-12 months |
| Groundwater treatment | $100,000 - $500,000+ | 2-10 years |
| Monitoring & closure | $30,000 - $80,000 | 3-5 years |
A straightforward diesel leak at a gas station — soil contamination only, no groundwater impact — runs roughly $130,000. Once benzene reaches the water table, costs jump past $250,000 and timelines stretch to a decade or more.
Multiply by 43,801 open cases: the nation's remaining UST cleanup tab exceeds $2.2 billion at minimum.
Where the Tanks Are
ZipCheckup's analysis of EJScreen data reveals the geographic concentration:
- 1,237 ZIP codes at "Very High" UST risk — their census tracts rank in the worst percentiles nationally for underground tank proximity
- 2,860 ZIP codes at "High" risk
- Combined, over 4,000 communities face elevated exposure to petroleum contamination from aging tanks
The states with the most open LUST cases: California, Texas, Florida, New York, and Michigan. But high-density clustering in specific ZIP codes means some small towns carry risk disproportionate to their size.
What This Means for Homeowners
If you live near an active LUST site:
- Test your well water if you rely on a private well within 1 mile of a LUST site. Benzene, toluene, and MTBE are the primary contaminants
- Check property records — title searches should reveal known contamination nearby, but many LUST sites are not on standard disclosure lists
- Monitor state cleanup progress — EPA's cleanup tracking system is public, but most homeowners never check it
The real cost isn't just the cleanup itself. It's the property value impact on surrounding homes, the health monitoring costs for exposed residents, and the years of uncertainty while remediation drags on.
The Data Gap
Here's what the data doesn't show: abandoned tanks. The EPA only tracks registered USTs. Tanks buried before the 1984 registration requirement — at old farms, decommissioned gas stations, former military sites — sit outside the tracking system entirely. EPA estimates there could be hundreds of thousands of unregistered tanks still in the ground.
Your ZIP code report on ZipCheckup includes UST proximity risk alongside 50+ other safety factors. Because the tank under the old Texaco station three blocks away isn't going to announce itself.
Frequently Asked Questions
How much does UST cleanup cost?
According to EPA data, the average UST cleanup costs between $130,000 and $250,000 per site. Complex sites with extensive groundwater contamination can exceed $1 million. With 43,801 open LUST cases nationwide, the estimated remaining cleanup cost exceeds $2.2 billion.
Who pays for underground tank cleanup?
In most cases, the tank owner is responsible. However, many sites are orphaned — the original owner is bankrupt or unknown. State UST trust funds, funded by fuel taxes, cover many orphaned cleanups. Ultimately, taxpayers and nearby property owners bear the economic impact through lower property values.
How long does a LUST cleanup take?
EPA data shows the average cleanup timeline is 5-15 years. Some sites in our database have been in active remediation for over 20 years. The lengthy process reflects the difficulty of removing petroleum compounds from groundwater once contamination occurs.
Does UST contamination affect property values?
Studies show properties within 1/4 mile of an active LUST site can lose 5-15% of their value. ZipCheckup maps UST proximity risk for 42,675 ZIP codes so you can check your area before buying or selling.