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Sewage treatment plant, major discharger, Tucson, Arizona. NPDES permit AZ0024121, in force until May 29, 2029. 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 | 006 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 006 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 006 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 006 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 450 kg/d | all year | 006 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 680 kg/d | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 006 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 006 |
| Solids, total suspended | monthly average | ≤ 450 kg/d | all year | 006 |
| Solids, total suspended | weekly average | ≤ 680 kg/d | all year | 006 |
| Oil & Grease | monthly average | report only (ug/L) | all year | 006 |
| Oil & Grease | daily maximum | report only (ug/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 Ratio | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 Ratio | all year | 006 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 006 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 006 |
| Sulfide, total [as S] | monthly average | report only (ug/L) | all year | 006 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 006 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 006 |
| Chlorine, total residual | monthly average | ≤ 140 g/d | all year | 006 |
| Chlorine, total residual | daily maximum | ≤ 270 g/d | all year | 006 |
| E. coli, colony forming units [CFU] | monthly average | ≤ 126 CFU/100mL | all year | 006 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 575 CFU/100mL | all year | 006 |
| Hydrogen sulfide | monthly average | report only (ug/L) | all year | 006 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 006 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 006 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 006 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | report only (pass=0;fail=1) | all year | 006 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year | 006 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | monthly median | report only (tox chronic) | all year | 006 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 006 |
| Static 7Day Chronic Pimephales Promelas | monthly median | report only (tox chronic) | all year | 006 |
| Static 7Day Chronic Pimephales Promelas | daily maximum | report only (tox chronic) | all year | 006 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | monthly median | report only (tox chronic) | all year | 006 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 006 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 007 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 007 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 007 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 007 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 450 kg/d | all year | 007 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 680 kg/d | all year | 007 |
| pH | minimum | ≥ 6.5 SU | all year | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 007 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 007 |
| Solids, total suspended | monthly average | ≤ 450 kg/d | all year | 007 |
| Solids, total suspended | weekly average | ≤ 680 kg/d | all year | 007 |
| Oil & Grease | monthly average | report only (ug/L) | all year | 007 |
| Oil & Grease | daily maximum | report only (ug/L) | all year | 007 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 007 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 Ratio | all year | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 Ratio | all year | 007 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 007 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 007 |
| Sulfide, total [as S] | monthly average | report only (ug/L) | all year | 007 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 007 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 007 |
| Chlorine, total residual | monthly average | ≤ 140 g/d | all year | 007 |
| Chlorine, total residual | daily maximum | ≤ 270 g/d | all year | 007 |
| E. coli, colony forming units [CFU] | monthly average | ≤ 126 CFU/100mL | all year | 007 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 575 CFU/100mL | all year | 007 |
| Hydrogen sulfide | monthly average | report only (ug/L) | all year | 007 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 007 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 007 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 007 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | report only (pass=0;fail=1) | all year | 007 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year | 007 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | monthly median | report only (tox chronic) | all year | 007 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 007 |
| Static 7Day Chronic Pimephales Promelas | monthly median | report only (tox chronic) | all year | 007 |
| Static 7Day Chronic Pimephales Promelas | daily maximum | report only (tox chronic) | all year | 007 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | monthly median | report only (tox chronic) | all year | 007 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 007 |
| 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/AZ0024121 · MCP: https://passage-data.com/mcp