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Sewerage Systems, major discharger, San Tan Valley, Arizona. NPDES permit AZ0026204, in force until Apr 20, 2030. Last 12 months: no values over a limit, 8 of 50 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| 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 | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 454 kg/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 681 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 | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 454 kg/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 681 kg/d | all year | 001 |
| Oil & Grease | monthly average | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (Ratio) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (Ratio) | all year | 001 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Sulfide, total [as S] | monthly average | report only (ug/L) | all year | 001 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | monthly average | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 120 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 250 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 1900 g/d | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 3700 g/d | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 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 | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 136 g/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 273 g/d | all year | 001 |
| E. coli, colony forming units [CFU] | monthly average | ≤ 126 CFU/100mL | all year | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 575 CFU/100mL | all year | 001 |
| Hydrogen sulfide | monthly average | report only (ug/L) | all year | 001 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/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 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 50 % effect | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | monthly median | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | ≤ 50 % effect | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 454 kg/d | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 681 kg/d | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 454 kg/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 681 kg/d | all year | 002 |
| Oil & Grease | monthly average | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (Ratio) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (Ratio) | all year | 002 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Sulfide, total [as S] | monthly average | report only (ug/L) | all year | 002 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 002 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Chromium, total [as Cr] | monthly average | report only (ug/L) | all year | 002 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 120 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 250 ug/L | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 1900 g/d | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 3700 g/d | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 136 g/d | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 273 g/d | all year | 002 |
| E. coli, colony forming units [CFU] | monthly average | ≤ 126 CFU/100mL | all year | 002 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 575 CFU/100mL | all year | 002 |
| Hydrogen sulfide | monthly average | report only (ug/L) | all year | 002 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 002 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 50 % effect | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | 002 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | monthly median | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | ≤ 50 % effect | all year | 002 |
| 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 |
| 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 | monthly average | ≤ 454 kg/d | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 681 kg/d | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 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 | monthly average | ≤ 454 kg/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 681 kg/d | all year | 003 |
| Oil & Grease | monthly average | report only (mg/L) | all year | 003 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (Ratio) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (Ratio) | all year | 003 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 003 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | 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 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 003 |
| Chromium, total [as Cr] | monthly average | report only (ug/L) | all year | 003 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | monthly average | ≤ 120 ug/L | all year | 003 |
| Zinc, total recoverable | daily maximum | ≤ 250 ug/L | all year | 003 |
| Zinc, total recoverable | monthly average | ≤ 1900 g/d | all year | 003 |
| Zinc, total recoverable | daily maximum | ≤ 3700 g/d | all year | 003 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | all year | 003 |
| Chromium, hexavalent dissolved [as Cr] | 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 | ≤ 18 ug/L | all year | 003 |
| Chlorine, total residual | monthly average | ≤ 136 g/d | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ 273 g/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 | ≤ 575 CFU/100mL | 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 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Mercury, total recoverable | 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 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 50 % effect | all year | 003 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | 003 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | monthly median | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | ≤ 50 % effect | 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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