What is the CalEPA Regulated Site Portal?

A public website, siteportal.calepa.ca.gov, that maps every site regulated under California's environmental programs and shows each site's inspections, violations, and enforcement actions. It draws from CERS for the local hazardous materials programs and from the Water Boards' systems for water discharge permits. It lists 264,785 sites with coordinates.

Can I look up a business's hazardous materials violations?

Yes. The portal is searchable by name and address and shows each site's inspection history, the code sections cited, the inspector's description, and the return-to-compliance date. The same records are downloadable in bulk as CSV files of sites, evaluations, violations, and enforcement actions.

Does a violation in the portal mean a business was fined?

The portal does not say. It records the violation, the agency's notes, and any formal action, but it does not record penalty amounts. From 2020 through 2025 the CUPAs recorded 624,254 violations and 21,316 notices of violation; most violations are handled in the inspection report and were corrected in a typical time of 41 days.

CalEPA Regulated Site Portal: What It Shows About a California Business

The CalEPA Regulated Site Portal is a map. Every site in the state’s hazardous materials programs and its water discharge permit programs is a point on it, and clicking a point opens that site’s record: the programs it is regulated under, the inspections it has had, the violations cited, and any enforcement action taken. It is at siteportal.calepa.ca.gov, and it is the public face of the records that businesses file and inspectors keep in CERS.

The portal lists 264,785 sites, every one with coordinates. From 2020 through 2025 it records 624,254 violations from local hazardous materials inspections at 94,628 of them. This site’s count of the most cited violations is computed from the portal’s own export.

What is in it

The portal combines two sets of records.

The Unified Program record, from CERS. Every inspection by a local CUPA or participating agency for the hazardous materials business plan, hazardous waste generation, underground and above-ground fuel tanks, and accidental release prevention. This is the large majority of the portal: 1,377,832 of the 1,456,364 violations in the export, across all years.
The Water Boards’ record, from CIWQS and SMARTS. Inspections and enforcement under water discharge permits and storm water permits. Those permits cover industrial and municipal discharges, construction and industrial storm water, and treatment plants.

For each site the portal shows four things: the site itself, with name, address, and map location; evaluations, meaning inspections, with the date, type, agency, program, and whether violations were found; violations, with the date, the code section cited, the agency’s description, and notes that usually include the return-to-compliance date; and enforcement actions, with the type, such as a notice of violation or an administrative order.

What it does not hold

Penalty amounts. Enforcement rows carry the action type and notes, not dollars.
The business’s industry. Sites have a name and an address but no industry code.
The filings themselves. The inventory, site map, and emergency plan a business files in CERS are not shown; the portal shows the inspection of them.

Reading a site’s record

A violation in the portal is a finding at an inspection, as the inspector recorded it. Most are recorded as corrected: 90% of the violations from 2020 through 2025 carry a return-to-compliance date in their notes, the typical one 41 days after the citation, and 43% within 30 days. A formal action is rarer. Over the same six years the CUPAs recorded 21,316 notices of violation at 8,841 sites and 1,887 administrative enforcement orders at 1,499 sites, against 624,254 violations.

Thirty-eight percent of hazardous materials inspection records from 2020 through 2025 recorded at least one violation, and the share ranged from 20% to 83% across the largest inspecting agencies. 94,628 California sites carry at least one violation from those six years, and 66,535 of them, 70%, were cited for a site map, an annual certification, or a training record.

Getting the data

The portal’s search results and site records can be exported, and CalEPA provides bulk downloads of the site list, evaluations, violations, and enforcement actions as CSV files. The export cut on September 10, 2026 held 264,785 site rows, 1,600,440 evaluation rows, 1,456,364 violation rows, and 175,804 enforcement rows. Anyone computing from it should note that an evaluation row is one inspection under one program, so a visit covering two programs appears twice, and that the violations and evaluations files carry a site identifier but not an address; the site file supplies that.

Hazardous materials in California

Sources

Counts are computed by CompliantCA from the CalEPA Regulated Site Portal exports downloaded September 10, 2026; the six-year figures cover Unified Program records dated January 1, 2020 through December 31, 2025, and the method is on the most cited violations page.

This page describes a public record. A record in the portal says what an inspector found and recorded, not what any business must do or owes.