Permanent Closure Requirements for Underground Storage Tank with Single-Walled Components
The California State Water Resources Control Board mandates that all underground storage tanks (USTs) with single-walled components must be permanently closed by December 31, 2025, as stipulated in Health and Safety Code §25292.05. Single-walled UST closure by end of 2025 is critical. This requirement applies to tanks and piping lacking secondary containment and continuous leak …