Clean Water Act discharge permit · NPDES NN0020265
CHINLE WWTF, Chinle, AZ: NPDES NN0020265 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 140Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
CHINLE WWTF, held by NAVAJO TRIBAL UTILITY AUTHORITY, holds NPDES permit NN0020265, which discharges to Chinle Wash. EPA’s file records it issued July 10, 2018 and expiring August 31, 2023.
CHINLE WWTF, Chinle, Arizona: Individual permit NN0020265, held by NAVAJO TRIBAL UTILITY AUTHORITY; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued July 10, 2018, term to August 31, 2023; discharges to CHINLE WASH.
- BOD, 5-day, 20 deg. C: 10 limits, 353 violations of any kind, 334 effluent exceedances, latest July 31, 2026, largest 617% over the limit.
- E. coli: 4 limits, 79 violations of any kind, 73 effluent exceedances, latest July 31, 2026, largest 99,999% over the limit.
- Nitrogen, ammonia total [as N]: 6 limits, 57 violations of any kind, 57 effluent exceedances, latest July 31, 2026, largest 2,560% over the limit.
- Solids, total suspended: 10 limits, 75 violations of any kind, 56 effluent exceedances, latest June 30, 2026, largest 148% over the limit.
- Chlorine, total residual: 2 limits, 27 violations of any kind, 21 effluent exceedances, latest March 31, 2013, largest 19,900% over the limit.
- Solids, suspended percent removal: 2 limits, 19 violations of any kind, 14 effluent exceedances, latest December 31, 2021, largest 129% over the limit.
- BOD, 5-day, percent removal: 2 limits, 13 violations of any kind, 8 effluent exceedances, latest June 30, 2025, largest 100% over the limit.
- Flow, in conduit or thru treatment plant: 8 limits, 19 violations of any kind, 2 effluent exceedances, latest July 31, 2016, largest 21% over the limit.
- Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia: 4 limits, 64 violations of any kind, 0 effluent exceedances.
- Pass/Fail Static Renewal 7Day Chronic Pimephales promelas: 4 limits, 64 violations of any kind, 0 effluent exceedances.
- TU Static Renewal 7-Day Chronic Ceriodaphnia dubia: 0 limits, 34 violations of any kind, 0 effluent exceedances.
- TU Static Renewal 7-Day Chronic Pimphales promelas: 0 limits, 34 violations of any kind, 0 effluent exceedances.
- Solids, total dissolved: 6 limits, 9 violations of any kind, 0 effluent exceedances.
- pH: 4 limits, 6 violations of any kind, 0 effluent exceedances.
- Nitrogen, ammonia [NH3-N]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. fahrenheit: 0 limits, 3 violations of any kind, 0 effluent exceedances.
- TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum): 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. centigrade: 4 limits, 0 violations of any kind, 0 effluent exceedances.
- Cyanide, total [as CN]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Asbestos: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Arsenic, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Selenium, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Thallium, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Beryllium, total recoverable [as Be]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chromium, hexavalent [as Cr]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chromium, trivalent [as Cr]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Nickel, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Silver total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Zinc, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Cadmium, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Lead, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Copper, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Antimony, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- 2-Methyl-4,6-dinitrophenol: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Dichlorobromomethane: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Carbon tetrachloride: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- 1,2-Dichloroethane: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Bromoform: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Dibromochloromethane: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chloroform: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Toluene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- .delta.-BHC: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Acenaphthylene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Acenaphthene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Acrolein: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Acrylonitrile: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Anthracene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzo[b]fluoranthene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzo[k]fluoranthene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Benzo[a]pyrene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroethyl] ether: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroethoxy]methane: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroisopropyl] ether: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Butyl benzyl phthalate: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chlorobenzene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chrysene: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Diethyl phthalate: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Dimethyl phthalate: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- 1,2-Diphenylhydrazine: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- February 22, 2024: Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment (EP6).
Arizona holds 91 Publicly owned treatment works coverages of this permit type in EPA’s file; 44 were issued before NN0020265. NAVAJO TRIBAL UTILITY AUTHORITY holds 8 permits in Arizona.
Other permits held by NAVAJO TRIBAL UTILITY AUTHORITY
- KAYENTA WASTEWATER TREATMENT LAGOON, Kayenta: NN0020281, issued June 12, 2018
- TUBA CITY WWTF, Tuba City: NN0020290, issued May 23, 2016
- WINDOW ROCK WWTF, Fort Defiance: NN0021555, issued January 21, 2016
- GANADO WWTP, Ganado: NN0022195, issued December 8, 2015
- PINON WWTF, Pinon: NN0024228, issued August 16, 2011
- KAYENTA WASTEWATER TREATMENT LAGOON, Kayenta: NNL020281, issued December 6, 2024
- GANADO WWTP, Ganado: NNL022195, issued January 30, 2024
Coverages issued nearest NN0020265
- January 19, 2018: USDOI NPS - GRAND CANYON NP - SOUTH RIM WWTP, Grand Canyon, AZ0022152, held by Usdoi Nps - Grand Canyon Np
- January 26, 2018: USDOI NPS - GRAND CANYON NP - NORTH RIM WWTP, Grand Canyon, AZ0110426, held by Grand Canyon National Park
- May 8, 2018: TOWN OF SUPERIOR WWTP, Superior, AZ0021199, held by Town Of Superior Public Works
- June 7, 2018: AGUA NUEVA WRF, Tucson, AZ0026107, held by Pima County - Regional Wastewater Reclamation Department
- June 12, 2018: KAYENTA WASTEWATER TREATMENT LAGOON, Kayenta, NN0020281, held by NAVAJO TRIBAL UTILITY AUTHORITY
- December 27, 2018: CITY OF AVONDALE - WRF, Avondale, AZ0023281, held by City Of Avondale
- March 6, 2019: CITY OF GOODYEAR - RAINBOW VALLEY WRF, Goodyear, AZ0025135, held by City Of Goodyear
- April 3, 2019: TOWN OF WINKELMAN - WWTP, Winkelman, AZ0020176, held by Town Of Winkelman
- May 3, 2019: PIMA COUNTY - TRES RIOS WWRF, Tucson, AZ0020001, held by Pima County - Regional Wastewater Reclamation Department
- May 16, 2019: CITY OF PEORIA - BUTLER DRIVE WRF, Peoria, AZ0025119, held by City Of Peoria
CHINLE WWTF among its neighbors
EPA’s permit file holds 23 discharge permits in the Nazlini Wash (Local Drainage) subwatershed (HUC 140802040708), NN0020265 among them. Its county holds 20, 1 of them major permits; NN0020265 is a minor permit.
Other permits in the Nazlini Wash (Local Drainage) subwatershed (HUC 140802040708)
- CH SEWER LAGOON SERVICE LINE, Chinle: AZR10I1GW, not classed
- CH: BUS BARN GAS LINE RE-ROUTE, Chinle: AZR10I143, not classed
- CH: CHINLE BEHAVIORAL HEALTH GAS CAPPING AND RE-ROUTE, Chinle: AZR10I13B, not classed
- CH: CHINLE NHA HMO GAS SERVICE EXTENSION, Chinle: AZR10I173, not classed
- CH: MESA VIEW GAS MAIN REROUTE AND RETIREMENT, Chinle: AZR10I14K, not classed
- CH: VALERIE ALLEN CAR WASH CAPPING, Chinle: AZR10I0SP, not classed
- CHINLE BUS BARN GAS MAIN RETIREMENT, Chinle: AZR10I0XG, not classed
- CHINLE CHURCHES CHICKEN, Chinle: AZR10I1GG, not classed
- CHINLE MVD GAS MEMBER EXTENSION, Chinle: AZR10I0M7, not classed
- CHINLE NTU, Chinle: AZR10I0HT, not classed
Identity
| Facility as filed | CHINLE WWTF |
|---|---|
| Permittee as filed | NAVAJO TRIBAL UTILITY AUTHORITY |
| NPDES ID | NN0020265 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 10, 2018 |
| Expiration date | August 31, 2023 |
| Address | Chinle, AZ 86503 |
| Receiving water | CHINLE WASH |
| Subwatershed | Nazlini Wash (Local Drainage) (HUC 140802040708) |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 145Pollutants on file
- 140Under a numeric limit
- 17With a violation of any kind
- 8With 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 145 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 10 | 353 | 334 | July 31, 2026 | 617% over the limit |
| E. coli | 4 | 79 | 73 | July 31, 2026 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 57 | 57 | July 31, 2026 | 2,560% over the limit |
| Solids, total suspended | 10 | 75 | 56 | June 30, 2026 | 148% over the limit |
| Chlorine, total residual | 2 | 27 | 21 | March 31, 2013 | 19,900% over the limit |
| Solids, suspended percent removal | 2 | 19 | 14 | December 31, 2021 | 129% over the limit |
| BOD, 5-day, percent removal | 2 | 13 | 8 | June 30, 2025 | 100% over the limit |
| Flow, in conduit or thru treatment plant | 8 | 19 | 2 | July 31, 2016 | 21% over the limit |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 64 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 4 | 64 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 0 | 34 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 0 | 34 | 0 | ||
| Solids, total dissolved | 6 | 9 | 0 | ||
| pH | 4 | 6 | 0 | ||
| Nitrogen, ammonia [NH3-N] | 0 | 5 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 3 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 0 | 2 | 0 | ||
| Temperature, water deg. centigrade | 4 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Asbestos | 2 | 0 | 0 | ||
| Arsenic, total recoverable | 2 | 0 | 0 | ||
| Selenium, total recoverable | 2 | 0 | 0 | ||
| Thallium, total recoverable | 2 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 2 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 2 | 0 | 0 | ||
| Chromium, trivalent [as Cr] | 2 | 0 | 0 | ||
| Nickel, total recoverable | 2 | 0 | 0 | ||
| Silver total recoverable | 2 | 0 | 0 | ||
| Zinc, total recoverable | 2 | 0 | 0 | ||
| Cadmium, total recoverable | 2 | 0 | 0 | ||
| Lead, total recoverable | 2 | 0 | 0 | ||
| Copper, total recoverable | 2 | 0 | 0 | ||
| Antimony, total recoverable | 2 | 0 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 2 | 0 | 0 | ||
| Dichlorobromomethane | 2 | 0 | 0 | ||
| Carbon tetrachloride | 2 | 0 | 0 | ||
| 1,2-Dichloroethane | 2 | 0 | 0 | ||
| Bromoform | 2 | 0 | 0 | ||
| Dibromochloromethane | 2 | 0 | 0 | ||
| Chloroform | 2 | 0 | 0 | ||
| Toluene | 2 | 0 | 0 | ||
| Benzene | 2 | 0 | 0 | ||
| .delta.-BHC | 2 | 0 | 0 | ||
| Acenaphthylene | 2 | 0 | 0 | ||
| Acenaphthene | 2 | 0 | 0 | ||
| Acrolein | 2 | 0 | 0 | ||
| Acrylonitrile | 2 | 0 | 0 | ||
| Anthracene | 2 | 0 | 0 | ||
| Benzo[b]fluoranthene | 2 | 0 | 0 | ||
| Benzo[k]fluoranthene | 2 | 0 | 0 | ||
| Benzo[a]pyrene | 2 | 0 | 0 | ||
| Bis[2-chloroethyl] ether | 2 | 0 | 0 | ||
| Bis[2-chloroethoxy]methane | 2 | 0 | 0 | ||
| Bis[2-chloroisopropyl] ether | 2 | 0 | 0 | ||
| Butyl benzyl phthalate | 2 | 0 | 0 | ||
| Chlorobenzene | 2 | 0 | 0 | ||
| Chrysene | 2 | 0 | 0 | ||
| Diethyl phthalate | 2 | 0 | 0 | ||
| Dimethyl phthalate | 2 | 0 | 0 | ||
| 1,2-Diphenylhydrazine | 2 | 0 | 0 |
Inspections, violations and enforcement
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 22, 2024 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | EP6 |
Inspections
EPA’s inspection file holds no inspection for NPDES NN0020265.
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 NN0020265.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.