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Sewage treatment plant, major discharger, Parker, Arizona. NPDES permit AZ0021415, in force until Nov 30, 2026. Last 12 months: over a limit 17 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Selenium, total recoverable, daily maximum | 3.9 ug/L | ≤ 2.47 ug/L | 58% |
| October 2025 | Selenium, total recoverable, monthly average | 3.9 ug/L | ≤ 1.86 ug/L | 110% |
| November 2025 | Selenium, total recoverable, daily maximum | 3.1 ug/L | ≤ 2.47 ug/L | 26% |
| November 2025 | Selenium, total recoverable, monthly average | 3.1 ug/L | ≤ 1.86 ug/L | 67% |
| December 2025 | Selenium, total recoverable, daily maximum | 3.8 ug/L | ≤ 2.47 ug/L | 54% |
| December 2025 | Selenium, total recoverable, monthly average | 3.8 ug/L | ≤ 1.86 ug/L | 104% |
| February 2026 | Selenium, total recoverable, daily maximum | 3.8 ug/L | ≤ 2.47 ug/L | 54% |
| February 2026 | Selenium, total recoverable, monthly average | 3.8 ug/L | ≤ 1.86 ug/L | 104% |
| March 2026 | Selenium, total recoverable, daily maximum | 3.3 ug/L | ≤ 2.47 ug/L | 34% |
| March 2026 | Selenium, total recoverable, monthly average | 3.3 ug/L | ≤ 1.86 ug/L | 77% |
| May 2026 | Selenium, total recoverable, daily maximum | 2.7 ug/L | ≤ 2.47 ug/L | 9% |
| May 2026 | Selenium, total recoverable, monthly average | 2.7 ug/L | ≤ 1.86 ug/L | 45% |
| June 2026 | Selenium, total recoverable, daily maximum | 2.9 ug/L | ≤ 2.47 ug/L | 17% |
| June 2026 | Selenium, total recoverable, monthly average | 2.9 ug/L | ≤ 1.86 ug/L | 56% |
| July 2026 | Selenium, total recoverable, monthly average | 2.4 ug/L | ≤ 1.86 ug/L | 29% |
| August 2026 | Selenium, total recoverable, daily maximum | 2.7 ug/L | ≤ 2.47 ug/L | 9% |
| August 2026 | Selenium, total recoverable, monthly average | 2.7 ug/L | ≤ 1.86 ug/L | 45% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 136 kg/d | all year | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 204 kg/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | highest weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 136 kg/d | all year | 001 |
| Solids, total suspended | highest weekly average | ≤ 204 kg/d | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | ≤ 10 ug/L | all year | 001 |
| Arsenic, total recoverable | daily maximum | ≤ 20.1 ug/L | all year | 001 |
| Arsenic, total recoverable | monthly average | ≤ .045 kg/d | all year | 001 |
| Arsenic, total recoverable | daily maximum | ≤ .091 kg/d | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 1.86 ug/L | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 2.47 ug/L | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ .0084 kg/d | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ .0111 kg/d | all year | 001 |
| Boron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | highest weekly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 001 |
| E. coli | monthly average | ≤ 126 CFU/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 235 CFU/100mL | all year | 001 |
| Solids, total dissolved | maximum | ≤ 400 mg/L | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | report only (pass=0;fail=1) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | all year | 001Y |
| Arsenic, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Selenium, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Thallium, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Beryllium, total recoverable [as Be] | daily maximum | report only (mg/L) | all year | 001Y |
| Nickel, dissolved [as Ni] | daily maximum | report only (mg/L) | all year | 001Y |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001Y |
| Silver total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Chromium, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| Antimony, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| 2-Methyl-4,6-dinitrophenol | daily maximum | report only (mg/L) | all year | 001Y |
| Dichlorobromomethane | daily maximum | report only (mg/L) | all year | 001Y |
| Carbon tetrachloride | daily maximum | report only (mg/L) | all year | 001Y |
| 1,2-Dichloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| Bromoform | daily maximum | report only (mg/L) | all year | 001Y |
| Dibromochloromethane | daily maximum | report only (mg/L) | all year | 001Y |
| Chloroform | daily maximum | report only (mg/L) | all year | 001Y |
| Toluene | daily maximum | report only (mg/L) | all year | 001Y |
| Benzene | daily maximum | report only (mg/L) | all year | 001Y |
| .delta.-BHC | daily maximum | report only (mg/L) | all year | 001Y |
| Acenaphthylene | daily maximum | report only (mg/L) | all year | 001Y |
| Acenaphthene | daily maximum | report only (mg/L) | all year | 001Y |
| Acrolein | daily maximum | report only (mg/L) | all year | 001Y |
| Acrylonitrile | daily maximum | report only (mg/L) | all year | 001Y |
| Anthracene | daily maximum | report only (mg/L) | all year | 001Y |
| Benzo[b]fluoranthene | daily maximum | report only (mg/L) | all year | 001Y |
| Benzo[k]fluoranthene | daily maximum | report only (mg/L) | all year | 001Y |
| Benzo[a]pyrene | daily maximum | report only (mg/L) | all year | 001Y |
| Bis[2-chloroethyl] ether | daily maximum | report only (mg/L) | all year | 001Y |
| Bis[2-chloroethoxy]methane | daily maximum | report only (mg/L) | all year | 001Y |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (mg/L) | all year | 001Y |
| Butyl benzyl phthalate | daily maximum | report only (mg/L) | all year | 001Y |
| Chlorobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| Chrysene | daily maximum | report only (mg/L) | all year | 001Y |
| Diethyl phthalate | daily maximum | report only (mg/L) | all year | 001Y |
| Dimethyl phthalate | daily maximum | report only (mg/L) | all year | 001Y |
| 1,2-Diphenylhydrazine | daily maximum | report only (mg/L) | all year | 001Y |
| Endosulfan sulfate | daily maximum | report only (mg/L) | all year | 001Y |
| .beta.-Endosulfan | daily maximum | report only (mg/L) | all year | 001Y |
| .alpha.-Endosulfan | daily maximum | report only (mg/L) | all year | 001Y |
| Endrin aldehyde | daily maximum | report only (mg/L) | all year | 001Y |
| Ethylbenzene | daily maximum | report only (mg/L) | all year | 001Y |
| Fluoranthene | daily maximum | report only (mg/L) | all year | 001Y |
| Fluorene | daily maximum | report only (mg/L) | all year | 001Y |
| Hexachlorocyclopentadiene | daily maximum | report only (mg/L) | all year | 001Y |
| Hexachlorobutadiene | daily maximum | report only (mg/L) | all year | 001Y |
| Hexachloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| Indeno[1,2,3-cd]pyrene | daily maximum | report only (mg/L) | all year | 001Y |
| Isophorone | daily maximum | report only (mg/L) | all year | 001Y |
| Methyl bromide [Bromomethane] | daily maximum | report only (mg/L) | all year | 001Y |
| Methyl chloride [Chloromethane] | daily maximum | report only (mg/L) | all year | 001Y |
| Methylene chloride | daily maximum | report only (mg/L) | all year | 001Y |
| N-Nitrosodi-N-propylamine | daily maximum | report only (mg/L) | all year | 001Y |
| N-Nitrosodiphenylamine | daily maximum | report only (mg/L) | all year | 001Y |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (mg/L) | all year | 001Y |
| Nitrobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| Phenanthrene | daily maximum | report only (mg/L) | all year | 001Y |
| Pyrene | daily maximum | report only (mg/L) | all year | 001Y |
| Tetrachloroethylene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,1-Dichloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| 1,1-Dichloroethylene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,1,1-Trichloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| 1,1,2-Trichloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| Benzo[ghi]perylene | daily maximum | report only (mg/L) | all year | 001Y |
| Benzo[a]anthracene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,2-Dichlorobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,2-Dichloropropane | daily maximum | report only (mg/L) | all year | 001Y |
| trans-1,2-Dichloroethylene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,2,4-Trichlorobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| Dibenz[a,h]anthracene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,3-Dichlorobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| 1,4-Dichlorobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| 2-Chloroethyl vinyl ether, [mixed] | daily maximum | report only (mg/L) | all year | 001Y |
| 2-Chloronaphthalene | daily maximum | report only (mg/L) | all year | 001Y |
| 2-Chlorophenol | daily maximum | report only (mg/L) | all year | 001Y |
| 2-Nitrophenol | daily maximum | report only (mg/L) | all year | 001Y |
| Di-n-octyl phthalate | daily maximum | report only (mg/L) | all year | 001Y |
| 2,4-Dichlorophenol | daily maximum | report only (mg/L) | all year | 001Y |
| 2,4-Dimethylphenol | daily maximum | report only (mg/L) | all year | 001Y |
| 2,4-Dinitrotoluene | daily maximum | report only (mg/L) | all year | 001Y |
| 2,4-Dinitrophenol | daily maximum | report only (mg/L) | all year | 001Y |
| 2,4,6-Trichlorophenol | daily maximum | report only (mg/L) | all year | 001Y |
| 2,6-Dinitrotoluene | daily maximum | report only (mg/L) | all year | 001Y |
| 3,3'-Dichlorobenzidine | daily maximum | report only (mg/L) | all year | 001Y |
| 4-Bromophenyl phenyl ether | daily maximum | report only (mg/L) | all year | 001Y |
| 4-Nitrophenol | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1016 | daily maximum | report only (mg/L) | all year | 001Y |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | daily maximum | report only (mg/L) | all year | 001Y |
| Phenol | daily maximum | report only (mg/L) | all year | 001Y |
| Naphthalene | daily maximum | report only (mg/L) | all year | 001Y |
| Pentachlorophenol | daily maximum | report only (mg/L) | all year | 001Y |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (mg/L) | all year | 001Y |
| Di-n-butyl phthalate | daily maximum | report only (mg/L) | all year | 001Y |
| Benzidine | daily maximum | report only (mg/L) | all year | 001Y |
| Vinyl chloride | daily maximum | report only (mg/L) | all year | 001Y |
| Trichloroethylene | daily maximum | report only (mg/L) | all year | 001Y |
| 4,4'-DDT | daily maximum | report only (mg/L) | all year | 001Y |
| 4,4'-DDD | daily maximum | report only (mg/L) | all year | 001Y |
| 4,4'-DDE | daily maximum | report only (mg/L) | all year | 001Y |
| Aldrin | daily maximum | report only (mg/L) | all year | 001Y |
| .alpha.-BHC | daily maximum | report only (mg/L) | all year | 001Y |
| .beta.-BHC | daily maximum | report only (mg/L) | all year | 001Y |
| .gamma.-BHC | daily maximum | report only (mg/L) | all year | 001Y |
| Chlordane [tech mix. and metabolites] | daily maximum | report only (mg/L) | all year | 001Y |
| Dieldrin | daily maximum | report only (mg/L) | all year | 001Y |
| Endrin | daily maximum | report only (mg/L) | all year | 001Y |
| Toxaphene | daily maximum | report only (mg/L) | all year | 001Y |
| Heptachlor | daily maximum | report only (mg/L) | all year | 001Y |
| Heptachlor epoxide | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1221 | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1232 | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1242 | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1248 | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1254 | daily maximum | report only (mg/L) | all year | 001Y |
| PCB-1260 | daily maximum | report only (mg/L) | all year | 001Y |
| Hexachlorobenzene | daily maximum | report only (mg/L) | all year | 001Y |
| 4-Chloro-3-methylphenol | daily maximum | report only (mg/L) | all year | 001Y |
| Mercury, total recoverable | daily maximum | report only (mg/L) | all year | 001Y |
| 1,3-Dichloropropene | daily maximum | report only (mg/L) | all year | 001Y |
| Chloroethane | daily maximum | report only (mg/L) | all year | 001Y |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | highest weekly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | monthly average | report only (kg/d) | all year | INF |
| BOD, 5-day, 20 deg. C | daily maximum | report only (kg/d) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | highest weekly average | report only (mg/L) | all year | INF |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (kg/d) | all year | INF |
| Solids, total suspended | daily maximum | report only (kg/d) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | highest weekly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | INF |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | INF |
Cited limits by parameter: Arizona's rules and the federal ones.
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