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Sewage treatment plant, major discharger, Tucson, Arizona. NPDES permit AZ0020001, in force until May 15, 2027. Last 12 months: over a limit once (last October 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 4.8 Ratio | ≤ 2 Ratio | 140% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 5700 kg/d | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 8500 kg/d | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | minimum | report only (SU) | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| pH | maximum | report only (SU) | all year | 003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | ≤ 5700 kg/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 8500 kg/d | all year | 003 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 Ratio | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 Ratio | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Cyanide, total [as CN] | monthly average | ≤ 7.9 ug/L | all year | 003 |
| Cyanide, total [as CN] | daily maximum | ≤ 16 ug/L | all year | 003 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 003 |
| Cyanide, total [as CN] | monthly average | ≤ 1.5 kg/d | all year | 003 |
| Cyanide, total [as CN] | daily maximum | ≤ 3 kg/d | all year | 003 |
| Sulfide, total [as S] | monthly average | report only (ug/L) | all year | 003 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 003 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 003 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 003 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | monthly average | ≤ 2 ug/L | all year | 003 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year | 003 |
| Selenium, total recoverable | monthly average | ≤ .3 kg/d | all year | 003 |
| Selenium, total recoverable | daily maximum | ≤ .6 kg/d | all year | 003 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 003 |
| Boron, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Barium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 003 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 003 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| 2-Methyl-4,6-dinitrophenol | daily maximum | report only (ug/L) | all year | 003 |
| Tributyltin | daily maximum | report only (ug/L) | all year | 003 |
| Diquat | daily maximum | report only (ug/L) | all year | 003 |
| Manganese, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Uranium, total as U3O8 | daily maximum | report only (ug/L) | all year | 003 |
| Dinoseb | daily maximum | report only (ug/L) | all year | 003 |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year | 003 |
| Carbon tetrachloride | daily maximum | report only (ug/L) | all year | 003 |
| 1,2-Dichloroethane | daily maximum | report only (ug/L) | all year | 003 |
| Bromoform | daily maximum | report only (ug/L) | all year | 003 |
| Dibromochloromethane | daily maximum | report only (ug/L) | all year | 003 |
| Chloroform | daily maximum | report only (ug/L) | all year | 003 |
| Toluene | daily maximum | report only (ug/L) | all year | 003 |
| Benzene | daily maximum | report only (ug/L) | all year | 003 |
| .delta.-BHC | daily maximum | report only (ug/L) | all year | 003 |
| Acenaphthylene | daily maximum | report only (ug/L) | all year | 003 |
| Acenaphthene | daily maximum | report only (ug/L) | all year | 003 |
| Acrolein | daily maximum | report only (ug/L) | all year | 003 |
| Acrylonitrile | daily maximum | report only (ug/L) | all year | 003 |
| Anthracene | daily maximum | report only (ug/L) | all year | 003 |
| Benzo[b]fluoranthene | daily maximum | report only (ug/L) | all year | 003 |
| Benzo[k]fluoranthene | daily maximum | report only (ug/L) | all year | 003 |
| Benzo[a]pyrene | daily maximum | report only (ug/L) | all year | 003 |
| Bis[2-chloroethyl] ether | daily maximum | report only (ug/L) | all year | 003 |
| Bis[2-chloroethoxy]methane | daily maximum | report only (ug/L) | all year | 003 |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (ug/L) | all year | 003 |
| Butyl benzyl phthalate | daily maximum | report only (ug/L) | all year | 003 |
| Chlorobenzene | daily maximum | report only (ug/L) | all year | 003 |
| Chrysene | daily maximum | report only (ug/L) | all year | 003 |
| Diethyl phthalate | daily maximum | report only (ug/L) | all year | 003 |
| Dimethyl phthalate | daily maximum | report only (ug/L) | all year | 003 |
| 1,2-Diphenylhydrazine | daily maximum | report only (ug/L) | all year | 003 |
| Endosulfan sulfate | daily maximum | report only (ug/L) | all year | 003 |
| Endrin aldehyde | daily maximum | report only (ug/L) | all year | 003 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 003 |
| Fluoranthene | daily maximum | report only (ug/L) | all year | 003 |
| Fluorene | daily maximum | report only (ug/L) | all year | 003 |
| Hexachlorocyclopentadiene | daily maximum | report only (ug/L) | all year | 003 |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year | 003 |
| Hexachloroethane | daily maximum | report only (ug/L) | all year | 003 |
| Indeno[1,2,3-cd]pyrene | daily maximum | report only (ug/L) | all year | 003 |
| Isophorone | daily maximum | report only (ug/L) | all year | 003 |
| Methyl bromide [Bromomethane] | daily maximum | report only (ug/L) | all year | 003 |
| Methyl chloride [Chloromethane] | daily maximum | report only (ug/L) | all year | 003 |
| Methylene chloride | daily maximum | report only (ug/L) | all year | 003 |
| N-Nitrosodi-N-propylamine | daily maximum | report only (ug/L) | all year | 003 |
| N-Nitrosodiphenylamine | daily maximum | report only (ug/L) | all year | 003 |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | 003 |
| Nitrobenzene | daily maximum | report only (ug/L) | all year | 003 |
| Phenanthrene | daily maximum | report only (ug/L) | all year | 003 |
| Pyrene | daily maximum | report only (ug/L) | all year | 003 |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | 003 |
| 1,1-Dichloroethane | daily maximum | report only (ug/L) | all year | 003 |
| 1,1-Dichloroethylene | daily maximum | report only (ug/L) | all year | 003 |
| 1,1,1-Trichloroethane | daily maximum | report only (ug/L) | all year | 003 |
| 1,1,2-Trichloroethane | daily maximum | report only (ug/L) | all year | 003 |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (ug/L) | all year | 003 |
| Benzo[ghi]perylene | daily maximum | report only (ug/L) | all year | 003 |
| Benzo[a]anthracene | daily maximum | report only (ug/L) | all year | 003 |
| 1,2-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 003 |
| 1,2-Dichloropropane | daily maximum | report only (ug/L) | all year | 003 |
| trans-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year | 003 |
| 1,2,4-Trichlorobenzene | daily maximum | report only (ug/L) | all year | 003 |
| Dibenz[a,h]anthracene | daily maximum | report only (ug/L) | all year | 003 |
| 1,3-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 003 |
| 1,4-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 003 |
| 2-Chloroethyl vinyl ether, [mixed] | daily maximum | report only (ug/L) | all year | 003 |
| 2-Chloronaphthalene | daily maximum | report only (ug/L) | all year | 003 |
| 2-Chlorophenol | daily maximum | report only (ug/L) | all year | 003 |
| 2-Nitrophenol | daily maximum | report only (ug/L) | all year | 003 |
| Di-n-octyl phthalate | daily maximum | report only (ug/L) | all year | 003 |
| 2,4-Dichlorophenol | daily maximum | report only (ug/L) | all year | 003 |
| 2,4-Dimethylphenol | daily maximum | report only (ug/L) | all year | 003 |
| 2,4-Dinitrotoluene | daily maximum | report only (ug/L) | all year | 003 |
| 2,4-Dinitrophenol | daily maximum | report only (ug/L) | all year | 003 |
| 2,4,6-Trichlorophenol | daily maximum | report only (ug/L) | all year | 003 |
| 2,6-Dinitrotoluene | daily maximum | report only (ug/L) | all year | 003 |
| 3,3'-Dichlorobenzidine | daily maximum | report only (ug/L) | all year | 003 |
| 4-Bromophenyl phenyl ether | daily maximum | report only (ug/L) | all year | 003 |
| 4-Chlorophenyl phenyl ether | daily maximum | report only (ug/L) | all year | 003 |
| 4-Nitrophenol | daily maximum | report only (ug/L) | all year | 003 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | daily maximum | report only (ug/L) | all year | 003 |
| Phenol | daily maximum | report only (ug/L) | all year | 003 |
| Naphthalene | daily maximum | report only (ug/L) | all year | 003 |
| Dalapon | daily maximum | report only (ug/L) | all year | 003 |
| Oxamyl | daily maximum | report only (ug/L) | all year | 003 |
| Pentachlorophenol | daily maximum | report only (ug/L) | all year | 003 |
| Atrazine | daily maximum | report only (ug/L) | all year | 003 |
| Simazine | daily maximum | report only (ug/L) | all year | 003 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | 003 |
| Di-n-butyl phthalate | daily maximum | report only (ug/L) | all year | 003 |
| Benzidine | daily maximum | report only (ug/L) | all year | 003 |
| Vinyl chloride | daily maximum | report only (ug/L) | all year | 003 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 003 |
| 4,4'-DDT | daily maximum | report only (ug/L) | all year | 003 |
| 4,4'-DDD | daily maximum | report only (ug/L) | all year | 003 |
| 4,4'-DDE | daily maximum | report only (ug/L) | all year | 003 |
| Aldrin | daily maximum | report only (ug/L) | all year | 003 |
| .alpha.-BHC | daily maximum | report only (ug/L) | all year | 003 |
| .beta.-BHC | daily maximum | report only (ug/L) | all year | 003 |
| .gamma.-BHC | daily maximum | report only (ug/L) | all year | 003 |
| Chlordane [tech mix. and metabolites] | daily maximum | report only (ug/L) | all year | 003 |
| Dieldrin | daily maximum | report only (ug/L) | all year | 003 |
| Endosulfan, total | daily maximum | report only (ug/L) | all year | 003 |
| Endrin | daily maximum | report only (ug/L) | all year | 003 |
| Toxaphene | daily maximum | report only (ug/L) | all year | 003 |
| Heptachlor | daily maximum | report only (ug/L) | all year | 003 |
| Heptachlor epoxide | daily maximum | report only (ug/L) | all year | 003 |
| Methoxychlor | daily maximum | report only (ug/L) | all year | 003 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 003 |
| Malathion | daily maximum | report only (ug/L) | all year | 003 |
| Parathion | daily maximum | report only (ug/L) | all year | 003 |
| Guthion | daily maximum | report only (ug/L) | all year | 003 |
| Hexachlorobenzene | daily maximum | report only (ug/L) | all year | 003 |
| Picloram | daily maximum | report only (ug/L) | all year | 003 |
| 2,4-Dichlorophenoxyacetic acid | daily maximum | report only (ug/L) | all year | 003 |
| Mirex | daily maximum | report only (ug/L) | all year | 003 |
| 1,2-Dibromo-3-chloropropane | daily maximum | report only (ug/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 003 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 003 |
| Chlorine, total residual | monthly average | ≤ 1.7 kg/d | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ 3.4 kg/d | all year | 003 |
| E. coli, colony forming units [CFU] | monthly average | ≤ 126 CFU/100mL | all year | 003 |
| E. coli, colony forming units [CFU] | daily maximum | report only (CFU/100mL) | all year | 003 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 575 CFU/100mL | all year | 003 |
| Di[2-ethylhexyl] adipate | daily maximum | report only (ug/L) | all year | 003 |
| Endothall | daily maximum | report only (ug/L) | all year | 003 |
| 4-Chloro-3-methylphenol | daily maximum | report only (ug/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Hydrogen sulfide | monthly average | report only (ug/L) | all year | 003 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 003 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 003 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| cis-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year | 003 |
| 1,3-Dichloropropene | daily maximum | report only (ug/L) | all year | 003 |
| Ethylene dibromide | daily maximum | report only (ug/L) | all year | 003 |
| Alachlor | daily maximum | report only (ug/L) | all year | 003 |
| 2,4,5-TP | daily maximum | report only (ug/L) | all year | 003 |
| Glyphosate, total | daily maximum | report only (ug/L) | all year | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | 003 |
| Carbofuran | daily maximum | report only (ug/L) | all year | 003 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | 003 |
| Styrene | daily maximum | report only (ug/L) | all year | 003 |
| Paraquat | daily maximum | report only (ug/L) | all year | 003 |
| Permethrin, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Chloroethane | daily maximum | report only (ug/L) | all year | 003 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | monthly median | report only (tox chronic) | all year | 003 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 003 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 003 |
| Static 7Day Chronic Pimephales Promelas | monthly median | report only (tox chronic) | all year | 003 |
| Static 7Day Chronic Pimephales Promelas | daily maximum | report only (tox chronic) | all year | 003 |
| Static 7Day Chronic Pimephales Promelas | daily maximum | report only (tox chronic) | all year | 003 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | monthly median | report only (tox chronic) | all year | 003 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 003 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | weekly average | report only (mg/L) | all year | INF |
Cited limits by parameter: Arizona's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/AZ0020001 · MCP: https://passage-data.com/mcp