Stockton, City of

NPDES permit CA0079138 · Major POTW · effective, expires 2030-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

5values over a limit
0required values missing, on 0 form(s)
0of 35 forms filed late

Last period with anything received: 2026-07-31. Most often over: Coliform, total general (3), Solids, total suspended (2).

Reporting

Reports are due about 32 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (106)

OutfallParameterStatisticLimitMonths
EFFATemperature, water deg. fahrenheitINST MAX report only all year
EFFATurbidityDAILY MX report only all year
EFFASpecific conductanceMO AVG report only all year
EFFASpecific conductanceDAILY MX report only all year
EFFAOxygen, dissolved [DO]DLYAVMIN >= 5 mg/L Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Dec
EFFAOxygen, dissolved [DO]DLYAVMIN >= 6 mg/L Sep, Oct, Nov
EFFABOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFFABOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L all year
EFFApHINST MIN >= 6.5 SU all year
EFFApHINST MAX <= 8.5 SU all year
EFFASolids, total suspendedMO AVG <= 10 mg/L all year
EFFASolids, total suspendedWKLY AVG <= 15 mg/L all year
EFFANitrogen, ammonia total [as N]MO AVG <= 2.6 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFFANitrogen, ammonia total [as N]MO AVG <= 1.4 mg/L May, Jun, Jul, Aug, Sep, Oct
EFFANitrogen, ammonia total [as N]WKLY AVG <= 5.1 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFFANitrogen, ammonia total [as N]WKLY AVG <= 2.5 mg/L May, Jun, Jul, Aug, Sep, Oct
EFFANitrogen, nitrite total [as N]DAILY MX report only all year
EFFANitrogen, nitrate total [as N]DAILY MX report only all year
EFFANitrite + Nitrate total [as N]MO AVG <= 10 mg/L all year
EFFANitrite + Nitrate total [as N]WKLY AVG <= 14 mg/L all year
EFFAHardness, total [as CaCO3]DAILY MX report only all year
EFFADichlorobromomethaneMO AVG <= 17 ug/L all year
EFFADichlorobromomethaneDAILY MX <= 38 ug/L all year
EFFABromoformMO AVG <= 36 ug/L all year
EFFABromoformDAILY MX <= 110 ug/L all year
EFFADibromochloromethaneMO AVG <= 27 ug/L all year
EFFADibromochloromethaneDAILY MX <= 76 ug/L all year
EFFAChlorpyrifosMO AVG report only all year
EFFAChlorpyrifosDAILY MX report only all year
EFFADiazinonMO AVG report only all year
EFFADiazinonDAILY MX report only all year
EFFAFlow, in conduit or thru treatment plantMO AVG report only all year
EFFAFlow, in conduit or thru treatment plantDAILY MX report only all year
EFFAChlorine, total residual4A <= .011 mg/L all year
EFFAChlorine, total residual1I <= .019 mg/L all year
EFFASodium BisulfiteDAILY MX report only all year
EFFATemperature Increase Deg. FINST MAX <= 20 deg F all year
EFFADiazinon + ChlorpyrifosMO AVG <= 1 ug/L all year
EFFADiazinon + ChlorpyrifosWKLY AVG <= 1 ug/L all year
EFFASolids, total dissolvedDAILY MX report only all year
EFFAMercury, total recoverableDAILY MX report only all year
EFFAMercury, total recoverableANNL TOT <= 217 g/yr all year
EFFAColiform, total generalINST MAX <= 240 MPN/100mL all year
EFFAColiform, total general7C <= 2.2 MPN/100mL all year
EFFAColiform, total general3E <= 23 MPN/100mL all year
EFFAMethylmercuryDAILY MX report only all year
EFFAMethylmercuryDAILY MX report only all year
EFFABOD, 5-day, percent removalMO AV MN >= 85 % all year
EFFASolids, suspended percent removalMO AV MN >= 85 % all year
EFFASulfur dioxide, totalDAILY MX report only all year
EFFAChronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFFAChronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFFAChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
EFFBTemperature, water deg. fahrenheitINST MAX report only all year
EFFBSpecific conductanceMO AVG report only all year
EFFBSpecific conductanceDAILY MX report only all year
EFFBOxygen, dissolved [DO]DLYAVMIN >= 5 mg/L Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Dec
EFFBOxygen, dissolved [DO]DLYAVMIN >= 6 mg/L Sep, Oct, Nov
EFFBBOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFFBBOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L all year
EFFBpHINST MIN >= 6.5 SU all year
EFFBpHINST MAX <= 8.5 SU all year
EFFBSolids, total suspendedMO AVG <= 10 mg/L all year
EFFBSolids, total suspendedWKLY AVG <= 15 mg/L all year
EFFBNitrogen, ammonia total [as N]MO AVG <= 2.6 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFFBNitrogen, ammonia total [as N]MO AVG <= 1.4 mg/L May, Jun, Jul, Aug, Sep, Oct
EFFBNitrogen, ammonia total [as N]WKLY AVG <= 5.1 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFFBNitrogen, ammonia total [as N]WKLY AVG <= 2.5 mg/L May, Jun, Jul, Aug, Sep, Oct
EFFBNitrogen, nitrite total [as N]DAILY MX report only all year
EFFBNitrogen, nitrate total [as N]DAILY MX report only all year
EFFBNitrite + Nitrate total [as N]MO AVG <= 10 mg/L all year
EFFBNitrite + Nitrate total [as N]WKLY AVG <= 14 mg/L all year
EFFBCarbon, dissolved organic [as C]DAILY MX report only all year
EFFBHardness, total [as CaCO3]DAILY MX report only all year
EFFBChlorpyrifosMO AVG report only all year
EFFBChlorpyrifosDAILY MX report only all year
EFFBDiazinonMO AVG report only all year
EFFBDiazinonDAILY MX report only all year
EFFBFlow, in conduit or thru treatment plantMO AVG report only all year
EFFBFlow, in conduit or thru treatment plantDAILY MX report only all year
EFFBTemperature Increase Deg. FINST MAX <= 20 deg F all year
EFFBDiazinon + ChlorpyrifosMO AVG <= 1 ug/L all year
EFFBDiazinon + ChlorpyrifosWKLY AVG <= 1 ug/L all year
EFFBSolids, total dissolvedDAILY MX report only all year
EFFBMercury, total recoverableDAILY MX report only all year
EFFBMercury, total recoverableANNL TOT <= 217 g/yr all year
EFFBColiform, total generalINST MAX <= 240 MPN/100mL all year
EFFBColiform, total general7C <= 2.2 MPN/100mL all year
EFFBColiform, total general3E <= 23 MPN/100mL all year
EFFBMethylmercuryDAILY MX report only all year
EFFBMethylmercuryDAILY MX report only all year
EFFBBOD, 5-day, percent removalMO AV MN >= 85 % all year
EFFBSolids, suspended percent removalMO AV MN >= 85 % all year
EFFBChronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFFBChronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFFBChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
INF1Specific conductanceDAILY MX report only all year
INF1BOD, 5-day, 20 deg. CMO AVG report only all year
INF1BOD, 5-day, 20 deg. CDAILY MX report only all year
INF1pHINST MIN report only all year
INF1pHINST MAX report only all year
INF1Solids, total suspendedMO AVG report only all year
INF1Solids, total suspendedDAILY MX report only all year
INF1Flow, in conduit or thru treatment plantMO AVG report only all year
INF1Flow, in conduit or thru treatment plantDAILY MX report only all year
INF1Solids, total dissolvedDAILY MX report only all year

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