Clean Water Act discharge permit · NPDES CAZ476257

MATHESON TRI GAS RICHMOND, Richmond, CA: NPDES CAZ476257 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

MATHESON TRI GAS RICHMOND, held by Matheson, holds NPDES permit CAZ476257. EPA’s file records it issued August 9, 2016 and expiring June 30, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for MATHESON TRI GAS RICHMOND: its NPDES ID, its permit type and status, its dates, its address in Richmond, California. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES CAZ476257.

Identity

Facility as filed	MATHESON TRI GAS RICHMOND
Permittee as filed	Matheson
NPDES ID	CAZ476257
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Industrial stormwater
Issued	August 9, 2016
Expiration date	June 30, 2020
Issuing agency	CA Waterboards
Address	Richmond, CA 37185
Subwatershed	Pinole Creek-Frontal San Pablo Bay Estuaries (HUC 180500020702)
SIC	2813 – Industrial Gases
Other EPA IDs (FRS)	RCRA handler CAR000039966

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES CAZ476257.

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES CAZ476257.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID CAZ476257 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act discharge permit NPDES CAZ476257, held by Matheson for MATHESON TRI GAS RICHMOND in Richmond, CA, under the industrial stormwater program. The permit is listed as administratively continued, with a Minor Discharger class, an issue date of August 9, 2016, and an expiration date of June 30, 2020. The page lists 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance.