Clean Water Act discharge permit · NPDES NN0000019
APS FOUR CORNERS POWER PLANT, San Juan County, NM: NPDES NN0000019 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 144Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
APS FOUR CORNERS POWER PLANT, held by ARIZONA PUBLIC SERVICE CO, holds NPDES permit NN0000019, which discharges to Morgan Lake/Chaco River/San Juan. EPA’s file records it issued June 12, 2018 and expiring July 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | APS FOUR CORNERS POWER PLANT |
|---|---|
| Permittee as filed | ARIZONA PUBLIC SERVICE CO |
| NPDES ID | NN0000019 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 12, 2018 |
| Expiration date | July 31, 2023 |
| Address | San Juan County, NM 87416 |
| Receiving water | MORGAN LAKE/CHACO RIVER/SAN JUAN |
| Subwatershed | Morgan Lake-Chaco River (HUC 140801062008) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler NMD069409522; ICIS-AIR source NN00000035045NAV02 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 149Pollutants on file
- 144Under a numeric limit
- 119With a violation of any kind
- 3With 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; the 60 with the most exceedances of 149 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Oil and grease | 10 | 4 | 4 | November 30, 2017 | 9,650% over the limit |
| Chlorine, total residual | 2 | 5 | 2 | May 31, 2021 | 100% over the limit |
| Solids, total suspended | 6 | 2 | 1 | September 30, 2004 | 3% over the limit |
| Mercury, total [as Hg] | 2 | 8 | 0 | ||
| Static 4Day Chronic Selen. Capricornutum | 2 | 6 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 2 | 6 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 2 | 4 | 0 | ||
| Temperature, water deg. centigrade | 4 | 3 | 0 | ||
| Flow, in conduit or thru treatment plant | 12 | 2 | 0 | ||
| Solids, total dissolved | 4 | 2 | 0 | ||
| Arsenic, total [as As] | 2 | 2 | 0 | ||
| Boron, total [as B] | 2 | 2 | 0 | ||
| Cadmium, total [as Cd] | 2 | 2 | 0 | ||
| Nickel, total [as Ni] | 2 | 2 | 0 | ||
| Selenium, total [as Se] | 2 | 2 | 0 | ||
| Chromium, total [as Cr] | 0 | 2 | 0 | ||
| Zinc, total [as Zn] | 0 | 2 | 0 | ||
| Cyanide, total [as CN] | 2 | 1 | 0 | ||
| Arsenic, total recoverable | 2 | 1 | 0 | ||
| Selenium, total recoverable | 2 | 1 | 0 | ||
| Thallium, total recoverable | 2 | 1 | 0 | ||
| Beryllium, total recoverable [as Be] | 2 | 1 | 0 | ||
| Nickel, total recoverable | 2 | 1 | 0 | ||
| Silver total recoverable | 2 | 1 | 0 | ||
| Zinc, total recoverable | 2 | 1 | 0 | ||
| Cadmium, total recoverable | 2 | 1 | 0 | ||
| Lead, total recoverable | 2 | 1 | 0 | ||
| Chromium, total recoverable | 2 | 1 | 0 | ||
| Copper, total recoverable | 2 | 1 | 0 | ||
| Antimony, total recoverable | 2 | 1 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 2 | 1 | 0 | ||
| Dichlorobromomethane | 2 | 1 | 0 | ||
| Carbon tetrachloride | 2 | 1 | 0 | ||
| 1,2-Dichloroethane | 2 | 1 | 0 | ||
| Bromoform | 2 | 1 | 0 | ||
| Dibromochloromethane | 2 | 1 | 0 | ||
| Chloroform | 2 | 1 | 0 | ||
| Toluene | 2 | 1 | 0 | ||
| Benzene | 2 | 1 | 0 | ||
| Acenaphthylene | 2 | 1 | 0 | ||
| Acenaphthene | 2 | 1 | 0 | ||
| Acrolein | 2 | 1 | 0 | ||
| Acrylonitrile | 2 | 1 | 0 | ||
| Anthracene | 2 | 1 | 0 | ||
| Benzo[b]fluoranthene | 2 | 1 | 0 | ||
| Benzo[k]fluoranthene | 2 | 1 | 0 | ||
| Benzo[a]pyrene | 2 | 1 | 0 | ||
| Bis[2-chloroethyl] ether | 2 | 1 | 0 | ||
| Bis[2-chloroethoxy]methane | 2 | 1 | 0 | ||
| Bis[2-chloroisopropyl] ether | 2 | 1 | 0 | ||
| Butyl benzyl phthalate | 2 | 1 | 0 | ||
| Chlorobenzene | 2 | 1 | 0 | ||
| Chrysene | 2 | 1 | 0 | ||
| Diethyl phthalate | 2 | 1 | 0 | ||
| Dimethyl phthalate | 2 | 1 | 0 | ||
| 1,2-Diphenylhydrazine | 2 | 1 | 0 | ||
| Ethylbenzene | 2 | 1 | 0 | ||
| Fluoranthene | 2 | 1 | 0 | ||
| Fluorene | 2 | 1 | 0 | ||
| Hexachlorocyclopentadiene | 2 | 1 | 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 NN0000019.
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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Start the watch
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How we handle your data → Privacy
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 NN0000019 there.
Nearby on the register
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- Every permit record in San Juan County, A to Z
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- Every permit record in New Mexico, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.