Clean Water Act discharge permit · NPDES AZ0023558
SRP - SANTAN GENERATING STATION, Gilbert, AZ: NPDES AZ0023558 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
SRP - SANTAN GENERATING STATION, held by Srp - Santan Generating Station, holds NPDES permit AZ0023558. EPA’s file records it issued August 13, 2024 and expiring August 12, 2029. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SRP - SANTAN GENERATING STATION |
|---|---|
| Permittee as filed | Srp - Santan Generating Station |
| NPDES ID | AZ0023558 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | August 13, 2024 |
| Expiration date | August 12, 2029 |
| Address | Gilbert, AZ 85296 |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 19Pollutants on file
- 19Under a numeric limit
- 7With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| pH | 6 | 14 | 10 | December 31, 2013 | |
| Solids, total suspended | 6 | 4 | 4 | January 31, 2017 | 53% over the limit |
| Selenium, total recoverable | 6 | 74 | 3 | December 31, 2016 | 33% over the limit |
| Chlorine, total residual | 6 | 3 | 3 | February 28, 2015 | 67% over the limit |
| Copper, total recoverable | 4 | 73 | 2 | February 28, 2015 | 8% over the limit |
| Chromium, hexavalent dissolved [as Cr] | 6 | 74 | 1 | December 31, 2008 | 41% over the limit |
| Hardness, total [as CaCO3] | 6 | 24 | 0 | ||
| Oil & Grease | 6 | 0 | 0 | ||
| Chromium, total [as Cr] | 6 | 0 | 0 | ||
| Zinc, total recoverable | 6 | 0 | 0 | ||
| Chromium, total recoverable | 6 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 0 | 0 | ||
| Chlorine, free available | 6 | 0 | 0 | ||
| Cyanide, total [as CN] | 4 | 0 | 0 | ||
| Iron, total recoverable | 4 | 0 | 0 | ||
| Mercury, total recoverable | 4 | 0 | 0 | ||
| Arsenic, total recoverable | 2 | 0 | 0 | ||
| Boron, total recoverable | 2 | 0 | 0 | ||
| Nickel, total recoverable | 2 | 0 | 0 |
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 AZ0023558.
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 AZ0023558 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.