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Sewage treatment plant, major discharger, Stockton, California. NPDES permit CA0079138, in force until Jul 31, 2030. Last 12 months: over a limit 9 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| April 2026 | EFFB | Coliform, total general, 7-day median | 4.5 MPN/100mL | ≤ 2.2 MPN/100mL | 105% |
| June 2026 | EFFA | Coliform, total general, 7-day median | 4.5 MPN/100mL | ≤ 2.2 MPN/100mL | 105% |
| July 2026 | EFFB | Coliform, total general, 30-day maximum | 49 MPN/100mL | ≤ 23 MPN/100mL | 113% |
| July 2026 | EFFB | Solids, total suspended, monthly average | 333 mg/L | ≤ 10 mg/L | 3230% |
| July 2026 | EFFB | Solids, total suspended, weekly average | 220 mg/L | ≤ 15 mg/L | 1367% |
| August 2026 | EFFA | Chlorine, total residual, 1-hour average | 1.477 mg/L | ≤ .019 mg/L | 7674% |
| August 2026 | EFFA | Coliform, total general, 7-day median | 6.4 MPN/100mL | ≤ 2.2 MPN/100mL | 191% |
| August 2026 | EFFB | Coliform, total general, 7-day median | 6.4 MPN/100mL | ≤ 2.2 MPN/100mL | 191% |
| August 2026 | EFFB | Solids, total suspended, weekly average | > 4.5 mg/L | ≤ 15 mg/L | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | EFFA |
| Turbidity | daily maximum | report only (NTU) | all year | EFFA |
| Specific conductance | monthly average | report only (umho/cm) | all year | EFFA |
| Specific conductance | daily maximum | report only (umho/cm) | all year | EFFA |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Dec | EFFA |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | Sep–Nov | EFFA |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year | EFFA |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year | EFFA |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | EFFA |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | EFFA |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | EFFA |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | EFFA |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | EFFA |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | May–Oct | EFFA |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | EFFA |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.5 mg/L | May–Oct | EFFA |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | EFFA |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 14 mg/L | all year | EFFA |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFFA |
| Dichlorobromomethane | monthly average | ≤ 17 ug/L | all year | EFFA |
| Dichlorobromomethane | daily maximum | ≤ 38 ug/L | all year | EFFA |
| Bromoform | monthly average | ≤ 36 ug/L | all year | EFFA |
| Bromoform | daily maximum | ≤ 110 ug/L | all year | EFFA |
| Dibromochloromethane | monthly average | ≤ 27 ug/L | all year | EFFA |
| Dibromochloromethane | daily maximum | ≤ 76 ug/L | all year | EFFA |
| Chlorpyrifos | monthly average | report only (ug/L) | all year | EFFA |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | EFFA |
| Diazinon | monthly average | report only (ug/L) | all year | EFFA |
| Diazinon | daily maximum | report only (ug/L) | all year | EFFA |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | EFFA |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | EFFA |
| Chlorine, total residual | 4-day average | ≤ .011 mg/L | all year | EFFA |
| Chlorine, total residual | 1-hour average | ≤ .019 mg/L | all year | EFFA |
| Sodium Bisulfite | daily maximum | report only (mg/L) | all year | EFFA |
| Temperature Increase Deg. F | instantaneous maximum | ≤ 20 deg F | all year | EFFA |
| Diazinon + Chlorpyrifos | monthly average | ≤ 1 ug/L | all year | EFFA |
| Diazinon + Chlorpyrifos | weekly average | ≤ 1 ug/L | all year | EFFA |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | EFFA |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | EFFA |
| Mercury, total recoverable | annual total | ≤ 217 g/yr | all year | EFFA |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | all year | EFFA |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | all year | EFFA |
| Coliform, total general | 30-day maximum | ≤ 23 MPN/100mL | all year | EFFA |
| Methylmercury | daily maximum | report only (ng/L) | all year | EFFA |
| Methylmercury | daily maximum | report only (g/yr) | all year | EFFA |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | EFFA |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | EFFA |
| Sulfur dioxide, total | daily maximum | report only (mg/L) | all year | EFFA |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFFA |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | EFFA |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | EFFA |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | EFFB |
| Specific conductance | monthly average | report only (umho/cm) | all year | EFFB |
| Specific conductance | daily maximum | report only (umho/cm) | all year | EFFB |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Dec | EFFB |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | Sep–Nov | EFFB |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year | EFFB |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year | EFFB |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | EFFB |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | EFFB |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | EFFB |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | EFFB |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | EFFB |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | May–Oct | EFFB |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | EFFB |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.5 mg/L | May–Oct | EFFB |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | EFFB |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | EFFB |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | EFFB |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 14 mg/L | all year | EFFB |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/L) | all year | EFFB |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFFB |
| Chlorpyrifos | monthly average | report only (ug/L) | all year | EFFB |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | EFFB |
| Diazinon | monthly average | report only (ug/L) | all year | EFFB |
| Diazinon | daily maximum | report only (ug/L) | all year | EFFB |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | EFFB |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | EFFB |
| Temperature Increase Deg. F | instantaneous maximum | ≤ 20 deg F | all year | EFFB |
| Diazinon + Chlorpyrifos | monthly average | ≤ 1 ug/L | all year | EFFB |
| Diazinon + Chlorpyrifos | weekly average | ≤ 1 ug/L | all year | EFFB |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | EFFB |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | EFFB |
| Mercury, total recoverable | annual total | ≤ 217 g/yr | all year | EFFB |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | all year | EFFB |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | all year | EFFB |
| Coliform, total general | 30-day maximum | ≤ 23 MPN/100mL | all year | EFFB |
| Methylmercury | daily maximum | report only (ng/L) | all year | EFFB |
| Methylmercury | daily maximum | report only (g/yr) | all year | EFFB |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | EFFB |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | EFFB |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFFB |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | EFFB |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | EFFB |
| Specific conductance | daily maximum | report only (umho/cm) | all year | INF1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF1 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF1 |
| pH | instantaneous minimum | report only (SU) | all year | INF1 |
| pH | instantaneous maximum | report only (SU) | all year | INF1 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF1 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF1 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | INF1 |
Cited limits by parameter: California's rules and the federal ones.
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