NPDES AZ0020001 · Clean Water Act
PIMA COUNTY - TRES RIOS WWRF, Tucson, AZ: NPDES AZ0020001 discharge permit, effluent exceedances, inspections, penalties
PIMA COUNTY - TRES RIOS WWRF, Tucson, Arizona: Individual permit AZ0020001, held by Pima County - Regional Wastewater Reclamation Department; Publicly owned treatment works; Effective; issued May 3, 2019, term to July 9, 2022.
- Chlorine, total residual: 5 limits, 30 violations of any kind, 23 effluent exceedances, latest November 30, 2012, largest 30,900% over the limit.
- E. coli, colony forming units [CFU]: 3 limits, 11 violations of any kind, 8 effluent exceedances, latest April 30, 2013, largest 320% over the limit.
- Cyanide, total [as CN]: 5 limits, 18 violations of any kind, 7 effluent exceedances, latest August 31, 2024, largest 571% over the limit.
- Nitrogen, ammonia total [as N]: 3 limits, 7 violations of any kind, 5 effluent exceedances, latest October 31, 2025, largest 148% over the limit.
- Di[2-ethylhexyl] phthalate [DEHP]: 1 limit, 20 violations of any kind, 4 effluent exceedances, latest September 30, 2006, largest 333% over the limit.
- pH: 4 limits, 12 violations of any kind, 2 effluent exceedances, latest February 28, 2014.
- Copper, total recoverable: 1 limit, 29 violations of any kind.
- Solids, total suspended: 7 limits, 19 violations of any kind.
- BOD, 5-day, 20 deg. C: 7 limits, 17 violations of any kind.
- Silver total recoverable: 5 limits, 17 violations of any kind.
- Lead, total recoverable: 1 limit, 17 violations of any kind.
- Chromium, hexavalent dissolved [as Cr]: 1 limit, 13 violations of any kind.
- Oil & Grease: 2 limits, 9 violations of any kind.
- TU Static Renewal 7-Day Chronic Pimphales promelas: 3 limits, 7 violations of any kind.
- 1,2-Dichloropropane: 1 limit, 7 violations of any kind.
- Hardness, total [as CaCO3]: 3 limits, 6 violations of any kind.
- Flow, in conduit or thru treatment plant: 2 limits, 6 violations of any kind.
- Selenium, total recoverable: 1 limit, 5 violations of any kind.
- Mercury, total recoverable: 2 limits, 4 violations of any kind.
- Nitrogen, Kjeldahl, total [as N]: 1 limit, 4 violations of any kind.
- Nitrite + Nitrate total [as N]: 1 limit, 4 violations of any kind.
- Phosphorus, total [as P]: 1 limit, 4 violations of any kind.
- Beryllium, total recoverable [as Be]: 1 limit, 4 violations of any kind.
- Nickel, total recoverable: 1 limit, 4 violations of any kind.
- Zinc, total recoverable: 1 limit, 4 violations of any kind.
- Solids, total dissolved: 1 limit, 4 violations of any kind.
- Chromium, total recoverable: 0 limits, 4 violations of any kind.
- Antimony, total recoverable: 1 limit, 3 violations of any kind.
- Cadmium, dissolved [as Cd]: 0 limits, 3 violations of any kind.
- Temperature, water deg. centigrade: 3 limits, 2 violations of any kind.
- Sulfide, total [as S]: 3 limits, 2 violations of any kind.
- TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum): 3 limits, 2 violations of any kind.
- TU Static Renewal 7-Day Chronic Ceriodaphnia dubia: 3 limits, 2 violations of any kind.
- Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind.
- 2-Methyl-4,6-dinitrophenol: 1 limit, 2 violations of any kind.
- Diquat: 1 limit, 2 violations of any kind.
- Dichlorobromomethane: 1 limit, 2 violations of any kind.
- Carbon tetrachloride: 1 limit, 2 violations of any kind.
- Dibromochloromethane: 1 limit, 2 violations of any kind.
- Toluene: 1 limit, 2 violations of any kind.
- Benzene: 1 limit, 2 violations of any kind.
- .delta.-BHC: 1 limit, 2 violations of any kind.
- Acenaphthylene: 1 limit, 2 violations of any kind.
- Acenaphthene: 1 limit, 2 violations of any kind.
- Acrolein: 1 limit, 2 violations of any kind.
- Acrylonitrile: 1 limit, 2 violations of any kind.
- Anthracene: 1 limit, 2 violations of any kind.
- Benzo[b]fluoranthene: 1 limit, 2 violations of any kind.
- Benzo[k]fluoranthene: 1 limit, 2 violations of any kind.
- Benzo[a]pyrene: 1 limit, 2 violations of any kind.
- Bis[2-chloroethyl] ether: 1 limit, 2 violations of any kind.
- Bis[2-chloroethoxy]methane: 1 limit, 2 violations of any kind.
- Bis[2-chloroisopropyl] ether: 1 limit, 2 violations of any kind.
- Butyl benzyl phthalate: 1 limit, 2 violations of any kind.
- Chlorobenzene: 1 limit, 2 violations of any kind.
- Chrysene: 1 limit, 2 violations of any kind.
- Diethyl phthalate: 1 limit, 2 violations of any kind.
- Dimethyl phthalate: 1 limit, 2 violations of any kind.
- 1,2-Diphenylhydrazine: 1 limit, 2 violations of any kind.
- Endrin aldehyde: 1 limit, 2 violations of any kind.
Arizona holds 91 Publicly owned treatment works coverages of this permit type in EPA’s file; 48 were issued before AZ0020001. Pima County - Regional Wastewater Reclamation Department holds 5 permits in Arizona.
Other permits held by Pima County - Regional Wastewater Reclamation Department
- PIMA COUNTY - WWMD - AVRA VALLEY WWTF, Tucson: AZ0024121, issued 2019-07-16
- PIMA COUNTY - WWMD - GREEN VALLEY BNRO - WWTP, Sahuarita: AZ0024937, issued 2021-02-02
- AGUA NUEVA WRF, Tucson: AZ0026107, issued 2018-06-07
- PIMA COUNTY - WATER & ENERGY SUSTAINABILITY CENTER, Tucson: AZDM90096, issued 2021-07-14
Coverages issued nearest AZ0020001
- 2018-06-12: KAYENTA WASTEWATER TREATMENT LAGOON, Kayenta: NN0020281, held by NAVAJO TRIBAL UTILITY AUTHORITY
- 2018-07-10: CHINLE WWTF, Chinle: NN0020265, held by NAVAJO TRIBAL UTILITY AUTHORITY
- 2018-12-27: CITY OF AVONDALE - WRF, Avondale: AZ0023281, held by City Of Avondale
- 2019-03-06: CITY OF GOODYEAR - RAINBOW VALLEY WRF, Goodyear: AZ0025135, held by City Of Goodyear
- 2019-04-03: TOWN OF WINKELMAN - WWTP, Winkelman: AZ0020176, held by Town Of Winkelman
- 2019-05-16: CITY OF PEORIA - BUTLER DRIVE WRF, Peoria: AZ0025119, held by City Of Peoria
- 2019-07-16: PIMA COUNTY - WWMD - AVRA VALLEY WWTF, Tucson: AZ0024121, held by Pima County - Regional Wastewater Reclamation Department
- 2019-08-05: CITY OF PHOENIX - 23RD AVENUE WWTP, Phoenix: AZ0020559, held by City Of Phoenix
- 2019-08-05: TOWN OF CAVE CREEK - WRF, Cave Creek: AZ0025828, held by Town Of Cave Creek
- 2019-10-03: APACHE JUNCTION SEWER DISTRICT WWTP, Apache Junction: AZ0023931, held by Superstition Mountains Community Facilities District No 1
PIMA COUNTY - TRES RIOS WWRF among its neighbors
46 discharge permits are in the Ruelas Canyon-Santa Cruz River subwatershed (HUC 150503010908); AZ0020001 is one. Its county: 188, 6 major; AZ0020001 is major permit.
Other permits in the Ruelas Canyon-Santa Cruz River subwatershed (HUC 150503010908)
- 23-050.7 FOREBAY FARROW AREA, Unknown: AZC111011, minor, term to 2030-08-28
- 25-038 TWIN PEAKS VISTA, Unknown: AZC110370, minor, term to 2025-08-28
- 25-038 TWIN PEAKS VISTA, Unknown: AZC111742, minor, term to 2030-08-28
- 26-033 CASCADA, Unknown: AZC115280, minor, term to 2030-08-28
- AMAZON.COM SERVICES LLC - DAZ4, Unknown: AZI109030, minor, term to 2030-01-15
- AMAZON.COM SERVICES LLC - DAZ4, Unknown: AZMS95414, minor, term to 2024-12-31
- AMERICAN FURNITURE WAREHOUSE MARANA, Unknown: AZCN97596, minor, term to 2025-06-30
- ANGEL'S CROSSING, Unknown: AZC111691, minor, term to 2030-08-28
- ARIZONA PORTLAND CEMENT CO, Rillito: AZS000014
- AZ NFSR 289 BRIDGE REP, Unknown: AZC115273, minor, term to 2030-08-28
Identity
| Facility | PIMA COUNTY - TRES RIOS WWRF |
|---|---|
| Permittee | Pima County - Regional Wastewater Reclamation Department |
| NPDES ID | AZ0020001 |
| Status | Effective |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 3, 2019 |
| Expires | July 9, 2022 |
| Address | Tucson, AZ 85743 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Ruelas Canyon-Santa Cruz River (HUC 150503010908) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler AZD981425101; ICIS-AIR source AZPMC00004019P1903 |
NPDES AZ0020001: effluent limits and exceedances
PIMA COUNTY - TRES RIOS WWRF (NPDES AZ0020001): 179 pollutants on file, 175 limited; 165 with a violation of any kind, 6 with an exceedance.
The 60 with the most exceedances of the 179 on file for NPDES AZ0020001. How exceedances are counted.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Chlorine, total residual | 5 | 30 | 23 | November 30, 2012 | 30,900% over the limit |
| E. coli, colony forming units [CFU] | 3 | 11 | 8 | April 30, 2013 | 320% over the limit |
| Cyanide, total [as CN] | 5 | 18 | 7 | August 31, 2024 | 571% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 7 | 5 | October 31, 2025 | 148% over the limit |
| Di[2-ethylhexyl] phthalate [DEHP] | 1 | 20 | 4 | September 30, 2006 | 333% over the limit |
| pH | 4 | 12 | 2 | February 28, 2014 | |
| Copper, total recoverable | 1 | 29 | 0 | ||
| Solids, total suspended | 7 | 19 | 0 | ||
| BOD, 5-day, 20 deg. C | 7 | 17 | 0 | ||
| Silver total recoverable | 5 | 17 | 0 | ||
| Lead, total recoverable | 1 | 17 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 1 | 13 | 0 | ||
| Oil & Grease | 2 | 9 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 3 | 7 | 0 | ||
| 1,2-Dichloropropane | 1 | 7 | 0 | ||
| Hardness, total [as CaCO3] | 3 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Selenium, total recoverable | 1 | 5 | 0 | ||
| Mercury, total recoverable | 2 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 4 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 4 | 0 | ||
| Phosphorus, total [as P] | 1 | 4 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 4 | 0 | ||
| Nickel, total recoverable | 1 | 4 | 0 | ||
| Zinc, total recoverable | 1 | 4 | 0 | ||
| Solids, total dissolved | 1 | 4 | 0 | ||
| Chromium, total recoverable | 0 | 4 | 0 | ||
| Antimony, total recoverable | 1 | 3 | 0 | ||
| Cadmium, dissolved [as Cd] | 0 | 3 | 0 | ||
| Temperature, water deg. centigrade | 3 | 2 | 0 | ||
| Sulfide, total [as S] | 3 | 2 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 3 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 3 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 2 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 1 | 2 | 0 | ||
| Diquat | 1 | 2 | 0 | ||
| Dichlorobromomethane | 1 | 2 | 0 | ||
| Carbon tetrachloride | 1 | 2 | 0 | ||
| Dibromochloromethane | 1 | 2 | 0 | ||
| Toluene | 1 | 2 | 0 | ||
| Benzene | 1 | 2 | 0 | ||
| .delta.-BHC | 1 | 2 | 0 | ||
| Acenaphthylene | 1 | 2 | 0 | ||
| Acenaphthene | 1 | 2 | 0 | ||
| Acrolein | 1 | 2 | 0 | ||
| Acrylonitrile | 1 | 2 | 0 | ||
| Anthracene | 1 | 2 | 0 | ||
| Benzo[b]fluoranthene | 1 | 2 | 0 | ||
| Benzo[k]fluoranthene | 1 | 2 | 0 | ||
| Benzo[a]pyrene | 1 | 2 | 0 | ||
| Bis[2-chloroethyl] ether | 1 | 2 | 0 | ||
| Bis[2-chloroethoxy]methane | 1 | 2 | 0 | ||
| Bis[2-chloroisopropyl] ether | 1 | 2 | 0 | ||
| Butyl benzyl phthalate | 1 | 2 | 0 | ||
| Chlorobenzene | 1 | 2 | 0 | ||
| Chrysene | 1 | 2 | 0 | ||
| Diethyl phthalate | 1 | 2 | 0 | ||
| Dimethyl phthalate | 1 | 2 | 0 | ||
| 1,2-Diphenylhydrazine | 1 | 2 | 0 | ||
| Endrin aldehyde | 1 | 2 | 0 |
NPDES AZ0020001: inspections, violations and enforcement
NPDES AZ0020001 (PIMA COUNTY - TRES RIOS WWRF): no single-event violation, inspection, formal enforcement action and informal enforcement action on file.
Watch NPDES AZ0020001
NPDES AZ0020001: one email when its EPA record changes — $99/month.
Permits near NPDES AZ0020001
NPDES AZ0020001: 179 pollutant rows, 0 dated events; ICIS-NPDES download, loaded October 14, 2026.