Thousand Oaks, City of

NPDES permit CA0056294 · Major POTW · effective, expires 2031-07-31 · EPA's file as of 2026-09-19

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

2values over a limit
0required values missing, on 0 form(s)
0of 26 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chloride [as Cl] (1), Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas (1).

Reporting

Reports are due about 32 days after each monitoring period ends (the most common figure among CA permits in EPA's filings — check your permit).

Limits in force (107)

OutfallParameterStatisticLimitMonths
EFF5Temperature, water deg. fahrenheitINST MAX <= 80 deg F all year
EFF5TurbidityINST MAX <= 10 NTU all year
EFF5TurbidityDAILY AV <= 2 NTU all year
EFF5Oxygen, dissolved [DO]INST MIN report only all year
EFF5BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L all year
EFF5BOD, 5-day, 20 deg. CWKLY AVG <= 30 mg/L all year
EFF5BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
EFF5BOD, 5-day, 20 deg. CMO AVG <= 2300 lb/d all year
EFF5BOD, 5-day, 20 deg. CDAILY MX <= 5200 lb/d all year
EFF5pHINST MIN >= 6.5 SU all year
EFF5pHINST MAX <= 8.5 SU all year
EFF5Solids, total suspendedMO AVG <= 15 mg/L all year
EFF5Solids, total suspendedWKLY AVG <= 40 mg/L all year
EFF5Solids, total suspendedDAILY MX <= 45 mg/L all year
EFF5Solids, total suspendedMO AVG <= 1750 lb/d all year
EFF5Solids, total suspendedDAILY MX <= 5200 lb/d all year
EFF5Solids, settleableMO AVG <= .1 mL/L all year
EFF5Solids, settleableDAILY MX <= .3 mL/L all year
EFF5Nitrogen, total [as N]DAILY MX report only all year
EFF5Nitrogen, organic total [as N]DAILY MX report only all year
EFF5Nitrogen, ammonia total [as N]MO AVG <= 3.1 mg/L all year
EFF5Nitrogen, ammonia total [as N]DAILY MX <= 5.6 mg/L all year
EFF5Nitrogen, ammonia total [as N]DAILY MX report only all year
EFF5Nitrogen, nitrite total [as N]MO AVG <= 9 mg/L all year
EFF5Nitrogen, nitrate total [as N]MO AVG <= .9 mg/L all year
EFF5Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
EFF5Nitrite + Nitrate total [as N]MO AVG <= 9 mg/L all year
EFF5Phosphorus, total [as P]DAILY MX report only all year
EFF5Cyanide, total [as CN]MO AVG <= 4.2 ug/L all year
EFF5Cyanide, total [as CN]DAILY MX <= 8.5 ug/L all year
EFF5Cyanide, total [as CN]MO AVG <= .49 lb/d all year
EFF5Cyanide, total [as CN]DAILY MX <= .99 lb/d all year
EFF5Sulfide, dissolved, [as S]DAILY MX report only all year
EFF5Hardness, total [as CaCO3]DAILY MX report only all year
EFF5Chloride [as Cl]MO AVG <= 150 mg/L all year
EFF5Chloride [as Cl]MO AVG report only all year
EFF5Sulfate, total [as SO4]MO AVG <= 250 mg/L all year
EFF5Sulfate, total [as SO4]MO AVG report only all year
EFF5Iron, total recoverableDAILY MX report only all year
EFF5Selenium, total recoverableMO AVG <= 3 ug/L all year
EFF5Selenium, total recoverableDAILY MX <= 5 ug/L all year
EFF5Selenium, total recoverableMO AVG <= .4 lb/d all year
EFF5Selenium, total recoverableDAILY MX <= .6 lb/d all year
EFF5Boron, total recoverableMO AVG report only all year
EFF5Nickel, total recoverableMO AVG <= 153 ug/L all year
EFF5Nickel, total recoverableDAILY MX <= 231 ug/L all year
EFF5Nickel, total recoverableDAILY MX <= .3 lb/d all year
EFF5Zinc, total recoverableDAILY MX report only all year
EFF5Copper, total recoverableMO AVG <= 6 ug/L all year
EFF5Copper, total recoverableDAILY MX <= 9 ug/L all year
EFF5Copper, total recoverableDAILY MX <= .7 lb/d all year
EFF5Oil and greaseMO AVG <= 10 mg/L all year
EFF5Oil and greaseDAILY MX <= 15 mg/L all year
EFF5Oil and greaseMO AVG <= 1200 lb/d all year
EFF5Oil and greaseDAILY MX <= 1750 lb/d all year
EFF5Phosphate, ortho [as P]DAILY MX report only all year
EFF5DichlorobromomethaneDAILY MX report only all year
EFF5BromoformDAILY MX report only all year
EFF5DibromochloromethaneDAILY MX report only all year
EFF5ChloroformDAILY MX report only all year
EFF5Surfactants, as CTAS, effluentDAILY MX report only all year
EFF5Surfactants [MBAS]MO AVG <= .5 mg/L all year
EFF5Surfactants [MBAS]MO AVG <= 60 lb/d all year
EFF5Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= 4 mg/L all year
EFF5Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= .46 lb/d all year
EFF54,4'-DDTMO AVG <= .00059 ug/L all year
EFF54,4'-DDTDAILY MX <= .0012 ug/L all year
EFF54,4'-DDDMO AVG <= .00084 ug/L all year
EFF54,4'-DDDDAILY MX <= .0017 ug/L all year
EFF54,4'-DDEMO AVG <= .00059 ug/L all year
EFF54,4'-DDEDAILY MX <= .0012 ug/L all year
EFF5Chlordane [tech mix. and metabolites]MO AVG <= .00059 ug/L all year
EFF5Chlordane [tech mix. and metabolites]DAILY MX <= .0012 ug/L all year
EFF5DieldrinMO AVG <= .00014 ug/L all year
EFF5DieldrinDAILY MX <= .00028 ug/L all year
EFF5ToxapheneMO AVG <= .00016 ug/L all year
EFF5ToxapheneDAILY MX <= .00033 ug/L all year
EFF5Flow, in conduit or thru treatment plantMO AVG report only all year
EFF5Flow, in conduit or thru treatment plantDAILY MX report only all year
EFF5Chlorine, total residualDAILY MX <= .1 mg/L all year
EFF5Chlorine, total residualDAILY MX <= 10 lb/d all year
EFF5E. coliMO AVG report only all year
EFF5E. coliDAILY MX report only all year
EFF5Flow, totalTOTAL report only all year
EFF5Turbidity, time above limitMAXIMUM <= 72 min/d all year
EFF5Solids, total dissolvedMO AVG <= 850 mg/L all year
EFF5Solids, total dissolvedMO AVG report only all year
EFF5Mercury, total recoverableDAILY MX report only all year
EFF5Mercury, total recoverableMO AVG <= .022 lb/mo all year
EFF5Coliform, total generalINST MAX <= 240 CFU/100mL all year
EFF5Coliform, total general7C <= 2.2 CFU/100mL all year
EFF5BOD, 5-day, percent removalMO MIN >= 85 % all year
EFF5Solids, suspended percent removalMO MIN >= 85 % all year
EFF5Trihalomethane, tot.DAILY MX report only all year
EFF5PFAS SumDAILY MX report only all year
EFF5Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFF5Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFF5Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
INF1Temperature, water deg. fahrenheitINST MAX 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

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states