Environmental Programs public counter located on the 3rd floor of the Annex building in Alhambra is open to the public. In order to maintain facility capacity we have implemented an online appointment system. Masks are highly recommended at all times for all visitors and staff. Click here to schedule an in person appointment or call (626) 458-3517 for questions or assistance.

For Underground Storage Tanks questions or submissions, email us at ust@pw.lacounty.gov. You can also mail submissions to:

Los Angeles County Public Works
Environmental Programs Division
900 S. Fremont Ave
Alhambra, CA 91803

If you have any questions, contact the Environmental Programs Public Counter at (626) 458-3517, Monday to Thursday, 8 am to 4 pm.

Underground Storage Tank (UST) Unified Facility Permit

All new sites must obtain a permit through the PW Environmental Programs Division before installing underground storage tanks (USTs). All sites with USTs must have a current Unified Program Facility Permit. If a site has an un-permitted underground storage tank, it must be permitted before it is removed.

New Installation Application Forms


At least 4 sets of plans need to be submitted. Submitted plans should include the following:
  • Site plan to scale depicting the tank(s) and fill and piping sumps, type of hazardous substance to be stored, piping layout (product/waste, vapor recovery (gasoline), tank vent, remote fill) and dispensers (if any), location of monitoring system panel, audible/visual alarms (if any), emergency fuel shutdown switch, building structures, streets (and cross street), utilities, and north arrow;
  • A detailed parts list which includes the manufacturer name, model number, and third party approval of equipment to be installed. The parts list should include (but not be limited to):
    • Double-walled tank, size and product to be stored;
    • Spill buckets; drop tube; overfill protection device(s) - Phase I Enhanced Vapor Recovery equipment (see Air Resources Board Executive Orders)
    • Sumps (fill and piping);
    • Double-walled piping (product, vent, vapor recovery, remote fill, flex) and sizes;ยท Penetration/bulkhead fittings/test boots;
    • Turbine (for pressurized systems);
    • Automatic Line Leak Detector (for pressurized systems);
    • Under dispenser containment (UDC);
    • Monitoring panel and alarm;
    • Monitoring sensors for tank interstitial, automatic tank gage and/or high level alarm (if any), fill and piping sump sensors, UDC sensors and vacuum sensors.
  • Detail drawing of each: All primary and secondary containment equipment which is designed to hold hazardous substances (tanks, sumps, penetration fittings, piping, UDC) must be labeled as being product tight.
  • Tank details should show the parts listed above at a minimum.
All construction must conform to the requirements of the California Health & Safety Code (HSC) and California Code of Regulations (CCR), County Code, and local fire and building and safety codes.

When construction is completed

The CERTIFICATION OF INSTALLATION / MODIFICATION form must be submitted electronically to the CERS Business Portal before the UST system is put into service.

Tank tightness testing, line test results, results of enhanced leak detection or other approved method to satisfy requirements of the HSC/CCR, secondary containment testing results, monitoring system certification and line leak detector certification, must be submitted directly to DPW EPD before the UST system is put into service.
Managed by the Los Angeles County Public Works, Environmental Programs Division
Toll Free Phone Number: 1(888) CLEAN LA
Clean LA Home| Clean LA FAQ| About Clean LA| Clean LA Site Index| Contact Clean LA