Clean Water Act discharge permit · NPDES AZ0024640
SIX MILE LAGOON WASTEWATER TREATMENT FACILITY, Peridot, AZ: NPDES AZ0024640 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 148Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
SIX MILE LAGOON WASTEWATER TREATMENT FACILITY, held by San Carlos Apache Tribe Water Distribution and Wasteater Treatment Facilities Pr, holds NPDES permit AZ0024640, which discharges to San Carlos River. EPA’s file records it issued June 6, 2025 and expiring June 30, 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 | SIX MILE LAGOON WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | San Carlos Apache Tribe Water Distribution and Wasteater Treatment Facilities Pr |
| NPDES ID | AZ0024640 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | June 6, 2025 |
| Expiration date | June 30, 2030 |
| Issuing agency | US EPA Region 09 |
| Address | Peridot, AZ 85542 |
| Receiving water | San Carlos River |
| Subwatershed | Sycamore Gulch-Gila River (HUC 150400051006) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 148Pollutants on file
- 148Under a numeric limit
- 18With a violation of any kind
- 5With 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 148 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Solids, total suspended | 18 | 112 | 8 | March 31, 2026 | 263% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 32 | 8 | March 31, 2026 | 1,400% over the limit |
| Biochemical oxygen demand-5 | 16 | 101 | 5 | March 31, 2026 | 70% over the limit |
| E. coli | 10 | 61 | 5 | October 31, 2025 | 445% over the limit |
| Arsenic, total [as As] | 16 | 102 | 2 | January 31, 2026 | 2,972% over the limit |
| Boron, total [as B] | 16 | 100 | 0 | ||
| pH | 8 | 50 | 0 | ||
| Flow rate | 8 | 48 | 0 | ||
| Nitrite + Nitrate total [as N] | 8 | 48 | 0 | ||
| Temperature, water deg. centigrade | 6 | 33 | 0 | ||
| Oxygen, dissolved [DO] | 6 | 32 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 4 | 27 | 0 | ||
| Solids, suspended percent removal | 4 | 27 | 0 | ||
| Flow rate | 4 | 24 | 0 | ||
| Solids, settleable | 4 | 24 | 0 | ||
| Chlorine, total residual | 4 | 24 | 0 | ||
| Nitrogen, Ammonia Total | 4 | 24 | 0 | ||
| Oil & grease, total recoverable [Q/C] | 4 | 24 | 0 | ||
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | 8 | 0 | 0 | ||
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | 8 | 0 | 0 | ||
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | 8 | 0 | 0 | ||
| Cyanide, total [as CN] | 4 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 4 | 0 | 0 | ||
| Asbestos | 4 | 0 | 0 | ||
| Arsenic, total recoverable | 4 | 0 | 0 | ||
| Selenium, total recoverable | 4 | 0 | 0 | ||
| Thallium, total recoverable | 4 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 4 | 0 | 0 | ||
| Nickel, total recoverable | 4 | 0 | 0 | ||
| Silver total recoverable | 4 | 0 | 0 | ||
| Zinc, total recoverable | 4 | 0 | 0 | ||
| Cadmium, total recoverable | 4 | 0 | 0 | ||
| Lead, total recoverable | 4 | 0 | 0 | ||
| Chromium, total recoverable | 4 | 0 | 0 | ||
| Copper, total recoverable | 4 | 0 | 0 | ||
| Antimony, total recoverable | 4 | 0 | 0 | ||
| 1,2-Dichloropropylene | 4 | 0 | 0 | ||
| Dichlorobromomethane | 4 | 0 | 0 | ||
| Carbon tetrachloride | 4 | 0 | 0 | ||
| 1,2-Dichloroethane | 4 | 0 | 0 | ||
| Bromoform | 4 | 0 | 0 | ||
| Chloroform | 4 | 0 | 0 | ||
| Toluene | 4 | 0 | 0 | ||
| Benzene | 4 | 0 | 0 | ||
| .delta.-BHC | 4 | 0 | 0 | ||
| Acenaphthylene | 4 | 0 | 0 | ||
| Acenaphthene | 4 | 0 | 0 | ||
| Acrolein | 4 | 0 | 0 | ||
| Acrylonitrile | 4 | 0 | 0 | ||
| Anthracene | 4 | 0 | 0 | ||
| Benzo[k]fluoranthene | 4 | 0 | 0 | ||
| Benzo[a]pyrene | 4 | 0 | 0 | ||
| Bis[2-chloroethyl] ether | 4 | 0 | 0 | ||
| Bis[2-chloroethoxy]methane | 4 | 0 | 0 | ||
| Bis[2-chloroisopropyl] ether | 4 | 0 | 0 | ||
| Butyl benzyl phthalate | 4 | 0 | 0 | ||
| Chlorobenzene | 4 | 0 | 0 | ||
| Chlorodibromomethane | 4 | 0 | 0 | ||
| Chrysene | 4 | 0 | 0 | ||
| Diethyl phthalate | 4 | 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 AZ0024640.
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.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.