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Clean Water Act discharge permit · NPDES CAZ470123

DUNSTONE QUARRY, Oroville, CA: NPDES CAZ470123 discharge permit, effluent exceedances, inspections, penalties

DUNSTONE QUARRY, held by Dunstone Quarry, holds NPDES permit CAZ470123. EPA’s file records it issued May 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 DUNSTONE QUARRY: its NPDES ID, its permit type and status, its dates, its address in Oroville, California. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES CAZ470123.

Identity

Facility as filedDUNSTONE QUARRY
Permittee as filedDunstone Quarry
NPDES IDCAZ470123
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
IssuedMay 2, 2016
Expiration dateJune 30, 2020
Issuing agencyCA Waterboards
AddressOroville, CA 95966
SubwatershedWilson Creek-North Honcut Creek (HUC 180201590107)

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 CAZ470123.

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 CAZ470123.

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 CAZ470123 there.

Nearby on the register

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

What this page shows

DUNSTONE QUARRY is one of 2 storm water industrial permits on EPA's NPDES register in Oroville, and it is the only NPDES permit in the Wilson Creek-North Honcut Creek subwatershed (HUC 180201590107), which holds 1 such permit including this one. The permit records no pollutants under a numeric limit and no pollutants with an effluent exceedance, both counted at 0.