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Sewage treatment plant, major discharger, Mesa, Arizona. NPDES permit AZ0025151, in force until Aug 19, 2030. Last 12 months: no values over a limit. 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 | ≤ 910 kg/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 1400 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 | ≤ 910 kg/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 1400 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 | ≤ 1 Ratio | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 Ratio | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 2 ug/L | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 50 g/d | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 100 g/d | 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 | ≤ 270 g/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 540 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 |
| 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 96Hr Acute Ceriodaphnia Dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | report only (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 | 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 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | monthly median | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | report only (% 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 | ≤ 910 kg/d | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 1400 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 | ≤ 910 kg/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 1400 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 | ≤ 1 Ratio | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 Ratio | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ 2 ug/L | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ 50 g/d | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 100 g/d | 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 | ≤ 270 g/d | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 540 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 |
| 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 96Hr Acute Ceriodaphnia Dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | report only (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 | report only (pass=0;fail=1) | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | report only (pass=0;fail=1) | all year | 002 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | report only (% effect) | all year | 002 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | monthly median | report only (pass=0;fail=1) | all year | 002 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | report only (pass=0;fail=1) | all year | 002 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | daily maximum | report only (% effect) | all year | 002 |
| 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
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