Clean Water Act discharge permit · NPDES AZC112129

IRVINGTON GENERATING STATION, Tucson, AZ: NPDES AZC112129 discharge permit, effluent exceedances, inspections, penalties

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

IRVINGTON GENERATING STATION, held by Tucson Electric Power Company, holds NPDES permit AZC112129, which discharges to Unnamed Ephemeral Tributary. EPA’s file records it issued September 29, 2025 and expiring August 28, 2030. 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 IRVINGTON GENERATING STATION: its NPDES ID, its permit type and status, its dates, its address in Tucson, Arizona, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES AZC112129.

Identity

Facility as filed	IRVINGTON GENERATING STATION
Permittee as filed	Tucson Electric Power Company
NPDES ID	AZC112129
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	September 29, 2025
Expiration date	August 28, 2030
Issuing agency	ADEQ
Address	Tucson, AZ 85714
Receiving water	Unnamed ephemeral tributary
Subwatershed	Julian Wash (HUC 150503010904)
Other EPA IDs (FRS)	RCRA handler AZD983480740; ICIS-AIR source AZPMC00004019P1052

Cited to the EPA ICIS-NPDES permit file (ECHO 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 AZC112129.

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 AZC112129.

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 AZC112129 there.

Nearby on the register

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

The IRVINGTON GENERATING STATION, a general permit coverage held by Tucson Electric Power Company, is one of 105 general permit coverages in Pima County, including this one. It sits among 137 NPDES permits in the Julian Wash subwatershed, this one included, and 89.5% of the 105 Pima County general permit coverages were issued earlier than this permit. Of those 105 coverages, 0.0% have a violation on file, and the permit records no pollutants under a numeric limit and no effluent exceedances.