Clean Water Act discharge permit · NPDES AZC113638
RIO RICO SWITCHYARD SUBSTATION, Rio Rico, AZ: NPDES AZC113638 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 1Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
RIO RICO SWITCHYARD SUBSTATION, held by Tucson Electric Power Company, holds NPDES permit AZC113638, which discharges to Unnamed Ephemeral Tributary. EPA’s file records it issued December 4, 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.
Identity
| Facility as filed | RIO RICO SWITCHYARD SUBSTATION |
|---|---|
| Permittee as filed | Tucson Electric Power Company |
| NPDES ID | AZC113638 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 4, 2025 |
| Expiration date | August 28, 2030 |
| Issuing agency | ADEQ |
| Address | Rio Rico, AZ 85648 |
| Receiving water | Unnamed ephemeral tributary |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Canada de la Paloma-Santa Cruz River (HUC 150503010303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 1Pollutants on file
- 1Under a numeric limit
- 1With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| E. coli, colony forming units [CFU] | 2 | 1 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES AZC113638.
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 AZC113638.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, AZC113638.
Start the watch
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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 AZC113638 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.