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
- 0Inspections on file
- 0Formal enforcement actions
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.
SIX MILE LAGOON WASTEWATER TREATMENT FACILITY, Peridot, Arizona: Individual permit AZ0024640, held by San Carlos Apache Tribe Water Distribution and Wasteater Treatment Facilities Pr; Publicly owned treatment works; Effective; issued June 6, 2025, term to June 30, 2030, by US EPA Region 09; discharges to San Carlos River.
- Solids, total suspended: 18 limits, 112 violations of any kind, 8 effluent exceedances, latest March 31, 2026, largest 263% over the limit.
- Nitrogen, ammonia total [as N]: 4 limits, 32 violations of any kind, 8 effluent exceedances, latest March 31, 2026, largest 1,400% over the limit.
- Biochemical oxygen demand-5: 16 limits, 101 violations of any kind, 5 effluent exceedances, latest March 31, 2026, largest 70% over the limit.
- E. coli: 10 limits, 61 violations of any kind, 5 effluent exceedances, latest October 31, 2025, largest 445% over the limit.
- Arsenic, total [as As]: 16 limits, 102 violations of any kind, 2 effluent exceedances, latest January 31, 2026, largest 2,972% over the limit.
- Boron, total [as B]: 16 limits, 100 violations of any kind, 0 effluent exceedances.
- pH: 8 limits, 50 violations of any kind, 0 effluent exceedances.
- Flow rate: 8 limits, 48 violations of any kind, 0 effluent exceedances.
- Nitrite + Nitrate total [as N]: 8 limits, 48 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. centigrade: 6 limits, 33 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 6 limits, 32 violations of any kind, 0 effluent exceedances.
- BOD, carb-5 day, 20 deg C, percent removal: 4 limits, 27 violations of any kind, 0 effluent exceedances.
- Solids, suspended percent removal: 4 limits, 27 violations of any kind, 0 effluent exceedances.
- Flow rate: 4 limits, 24 violations of any kind, 0 effluent exceedances.
- Solids, settleable: 4 limits, 24 violations of any kind, 0 effluent exceedances.
- Chlorine, total residual: 4 limits, 24 violations of any kind, 0 effluent exceedances.
- Nitrogen, Ammonia Total: 4 limits, 24 violations of any kind, 0 effluent exceedances.
- Oil & grease, total recoverable [Q/C]: 4 limits, 24 violations of any kind, 0 effluent exceedances.
- Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia: 8 limits, 0 violations of any kind, 0 effluent exceedances.
- Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas: 8 limits, 0 violations of any kind, 0 effluent exceedances.
- Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata: 8 limits, 0 violations of any kind, 0 effluent exceedances.
- Cyanide, total [as CN]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Hardness, total [as CaCO3]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Asbestos: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Arsenic, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Selenium, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Thallium, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Beryllium, total recoverable [as Be]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Nickel, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Silver total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Zinc, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Cadmium, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Lead, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Chromium, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Copper, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Antimony, total recoverable: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- 1,2-Dichloropropylene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Dichlorobromomethane: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Carbon tetrachloride: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- 1,2-Dichloroethane: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Bromoform: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Chloroform: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Toluene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- .delta.-BHC: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Acenaphthylene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Acenaphthene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Acrolein: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Acrylonitrile: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Anthracene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzo[k]fluoranthene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzo[a]pyrene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroethyl] ether: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroethoxy]methane: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroisopropyl] ether: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Butyl benzyl phthalate: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Chlorobenzene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Chlorodibromomethane: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Chrysene: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Diethyl phthalate: 4 limits, 0 violations of any kind, 0 effluent exceedances.
Arizona holds 91 Publicly owned treatment works coverages of this permit type in EPA’s file; 82 were issued before AZ0024640.
Coverages issued nearest AZ0024640
- January 18, 2024: AZ STATE PKS PATAGONIA LAKE, Nogales, AZ0026620, held by Arizona State Parks
- April 3, 2024: CITY OF BUCKEYE - SUNDANCE WRF, Buckeye, AZ0024881, held by City Of Buckeye
- November 20, 2024: CITY OF MESA - NORTHWEST WRP, Mesa, AZ0024031, held by City Of Mesa - Water Resources
- December 2, 2024: CITY OF PHOENIX - CAVE CREEK WATER RECLAMATION PLANT, Phoenix, AZ0026727, held by City Of Phoenix
- March 13, 2025: CITY OF TOLLESON - WWTP, Tolleson, AZPT00017, held by City Of Tolleson
SIX MILE LAGOON WASTEWATER TREATMENT FACILITY among its neighbors
EPA’s permit file holds 1 discharge permits in the Sycamore Gulch-Gila River subwatershed (HUC 150400051006), AZ0024640 among them.
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) |
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 |
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES AZ0024640.
Inspections
EPA’s inspection file holds no inspection for NPDES AZ0024640.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES AZ0024640.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.