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State Water Resources Control Board staff outline broad rewrite of underground storage tank rules with 2026 effective date
Summary
Board staff presented a comprehensive rewrite of Title 23 UST regulations proposing new definitions, mandatory recordkeeping, stricter monitoring and testing, a phase-out of single-wall systems, faster reporting deadlines, and a 365‑day limit for permanent closure; guidance and updated forms will be issued before the rules take effect.
State Water Resources Control Board staff presented a proposed, comprehensive rewrite of underground storage tank (UST) regulations contained in Title 23 of the California Code of Regulations, describing new definitions, inspection and monitoring requirements, tightened reporting deadlines and administrative changes intended to better protect groundwater.
The presenter said the regulations "sẽ có hiệu lực vào ngày một tháng một năm hai nghìn lẻ hai mươi sáu" (are scheduled to take effect Jan. 1, 2026) and that guidance and updated forms will be available before that date. The rewrite would create three installation-based UST types with separate requirements, add a new classification for "abandoned" tanks, and require that abandoned tanks remain subject to annual inspection and, if returned to service, be upgraded to a type‑three configuration and pass enhanced leak‑detection testing.
Why it matters: the package tightens operational and enforcement standards the presenter said are intended to reduce undetected releases and speed remediation. Key changes described include a new three-tier violation classification to calibrate enforcement responses; required on‑site and off‑site record retention with a 36‑hour production window for off‑site records;…
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