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Draft rule requires new markings, manways and piping specs for USTs installed on/after Jan. 1, 2026

State Water Resources Control Board · December 17, 2025

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Summary

The draft imposes construction and installation changes: manways must be installed per manufacturer/industry code, new tanks installed on or after Jan. 1, 2026 must carry manufacturer identification and other markings, steel piping specs (ASTM A53 Schedule 40 primary, Schedule 10 secondary) are proposed, and anchoring is required in high ground-water areas.

State Water Board staff detailed proposed construction and installation requirements in Article 4 of the draft rewrite. The changes include mandatory manways installed in accordance with manufacturer instructions or recognized engineering standards, labeling requirements (manufacturer identification, production date, maximum burial depth, maximum test pressure and notation of striker-plate-free openings), and markings within the sub-collar for easier post-installation verification.

For piping and material specifications, staff said steel piping installed on or after Jan. 1, 2026 must meet ASTM A53 standards, be factory-coated black steel with a minimum Schedule 40 wall for primary containment and a minimum Schedule 10 wall for secondary containment. The draft also requires anchor methods approved by an industry code, engineering standard or a California registered professional engineer in high-groundwater areas to prevent flotation.

Staff also described repair and backfill verification requirements, mandatory replacement of single-wall spill buckets with secondary containment or double-walled options, and documentation requirements manufacturers must provide to demonstrate tank seam continuity before installation. The presentation framed these changes as measures to improve long-term integrity and make post-installation inspection and monitoring more reliable.

No formal Board decision was recorded during the presentation; staff asked stakeholders to review the technical details during the public-comment period.