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Clean Water Act discharge permit · NPDES CAZ475532

BARRON PRECISION, Ontario, CA: NPDES CAZ475532 discharge permit, effluent exceedances, inspections, penalties

BARRON PRECISION, held by Barron Precision, holds NPDES permit CAZ475532. EPA’s file records it issued August 2, 2016 and expiring June 30, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for BARRON PRECISION: its NPDES ID, its permit type and status, its dates, its address in Ontario, California. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES CAZ475532.

Identity

Facility as filedBARRON PRECISION
Permittee as filedBarron Precision
NPDES IDCAZ475532
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedAugust 2, 2016
Expiration dateJune 30, 2020
Issuing agencyCA Waterboards
AddressOntario, CA 91761
SubwatershedUpper Cucamonga Creek (HUC 180702030704)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES CAZ475532.

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES CAZ475532.

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.

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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 CAZ475532 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

BARRON PRECISION, a Storm Water Industrial general permit coverage in Ontario, California (NPDES ID CAZ475532), is one of 38 storm water industrial permits on EPA's NPDES register in Ontario, and 26.3% of those 38 carry a violation on file. The permit sits within a subwatershed that holds 15 NPDES permits, this one included, and it has 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance. Of the 36 storm water industrial permits in Ontario, 27.8% were issued earlier than this one, which was issued August 2, 2016 and is administratively continued.