EPA Strengthens Underground Storage Tank Rules to Safeguard Drinking Water

Imagine turning on your faucet to fill a glass with clear, clean water. This simple act of daily life represents a fundamental trust in our water infrastructure. Yet beneath this apparent safety lies a potential hazard few consider: the network of approximately 542,000 underground storage tanks (USTs) across the United States that store petroleum and hazardous substances.

These buried containers, while essential for modern life, pose a significant risk to nearly half of Americans who rely on groundwater for drinking water when leaks occur. The Environmental Protection Agency (EPA), in collaboration with states, territories, tribal nations, and industry partners, is working to strengthen protections against this invisible environmental threat.

Underground storage tank systems serve critical functions in modern society, storing gasoline, diesel, and other hazardous materials. Buried to save space and reduce fire risks, these tanks can develop leaks due to corrosion, aging, improper installation, or operational errors. When leaks occur, contaminants can seep into soil and groundwater, creating serious environmental and public health concerns.

• Groundwater contamination: As a primary drinking water source, groundwater contamination from UST leaks directly impacts public health. Common pollutants like benzene, toluene, ethylbenzene, and xylene (BTEX) have been linked to cancer and other serious health conditions with long-term exposure.
• Soil pollution: Leaked substances degrade soil quality, affecting plant life and disrupting ecosystems. Contaminated soil often requires expensive, time-consuming remediation efforts.
• Vapor intrusion: Volatile organic compounds (VOCs) from leaks can migrate through soil into buildings, compromising indoor air quality and creating health hazards for occupants.
• Explosion risks: Accumulated petroleum products in confined underground spaces may form explosive mixtures, creating potential safety hazards.

To address these risks, the EPA has established a multilayered regulatory framework focused on preventing leaks, improving detection capabilities, and ensuring effective remediation when incidents occur.

Leak Prevention Measures:

• Design and installation standards: Strict requirements mandate corrosion-resistant materials, leak detection systems, and regular inspections to maintain structural integrity.
• Operational protocols: Detailed procedures govern filling, unloading, maintenance, and repairs to minimize human error.
• Operator training: Mandatory education programs ensure proper handling and emergency response capabilities.

Enhanced Detection Systems:

• Automated monitoring: Required leak detection technology provides early warning capabilities.
• Regular inspections: State and local authorities conduct periodic evaluations of tank integrity and system functionality.
• Reporting requirements: Operators must promptly report suspected leaks to regulatory agencies.

Effective Remediation Approaches:

• Emergency response: Rapid containment protocols prevent further environmental damage.
• Contamination assessment: Comprehensive site evaluations determine pollution extent and severity.
• Restoration options: Tailored solutions address soil, groundwater, and vapor intrusion issues.
• Financial assistance: Special funds help operators cover cleanup costs.

The EPA provides specialized support to various groups involved in UST management:

Owners and Operators:

• Compliance guidance documents
• Industry best practice recommendations
• Technical support services

Inspectors:

• Comprehensive inspection manuals
• Professional certification courses
• Case study repositories

State and Local Agencies:

• Grant funding opportunities
• Regulatory technical assistance
• Information sharing platforms

Tribal Nations:

• Culturally appropriate training materials
• Educational publications
• Customized data analysis

The growing adoption of biofuels presents new technical challenges for UST systems. These alternative fuels may accelerate corrosion in certain tank materials, potentially increasing leak risks. The EPA is actively researching these impacts while developing updated regulations to address evolving fuel technologies.

• Material compatibility standards: New requirements ensure tank construction matches fuel characteristics.
• Corrosion research: Scientific studies examine degradation mechanisms and prevention methods.
• Regulatory updates: Rules evolve to accommodate new fuel formulations while maintaining safety.

Protecting groundwater from UST contamination requires sustained collaboration between federal, state, tribal, and industry partners. Through rigorous oversight, technological innovation, and shared best practices, this critical infrastructure can continue serving society while safeguarding public health and environmental quality for future generations.