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Calleguas Municipal Water District

Water Supply, major discharger, Thousand Oaks, California. NPDES permit CA0064521 expired Jul 31, 2024; its limits still apply. Last 12 months: over a limit 3 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: form A quarterly (114 values), form Q quarterly (150 values), form S twice a year
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 18 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
April 2026Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinis, value1.2 pass=0;fail=1< 1 pass=0;fail=120%
April 2026Coliform, total general, 90% of samples> 1.8 CFU/100mL≤ 230 CFU/100mL—
April 2026Coliform, total general, median> 1.8 CFU/100mL≤ 70 CFU/100mL—

Limits in force (276)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year
Turbiditymonthly average≤ 75 NTUall year
Turbiditymonthly average≤ 75 NTUall year
Turbidityweekly average≤ 100 NTUall year
Turbidityweekly average≤ 100 NTUall year
Turbidityinstantaneous maximum≤ 225 NTUall year
Turbidityinstantaneous maximum≤ 225 NTUall year
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 4800 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 4800 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 7200 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 7200 lb/dall year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Salinitydaily maximumreport only (ppk)all year
Salinitydaily maximumreport only (ppk)all year
Solids, total suspendedmonthly average≤ 60 mg/Lall year
Solids, total suspendedmonthly average≤ 60 mg/Lall year
Solids, total suspendedmonthly average≤ 9600 lb/dall year
Solids, total suspendedmonthly average≤ 9600 lb/dall year
Solids, settleablemonthly average≤ 1 mL/Lall year
Solids, settleablemonthly average≤ 1 mL/Lall year
Solids, settleableweekly average≤ 1.5 mL/Lall year
Solids, settleableweekly average≤ 1.5 mL/Lall year
Solids, settleableinstantaneous maximum≤ 3 mL/Lall year
Solids, settleableinstantaneous maximum≤ 3 mL/Lall year
Nitrogen, ammonia total [as N]daily maximumreport only (ug/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (ug/L)all year
Cyanide, total [as CN]daily maximumreport only (ug/L)all year
Cyanide, total [as CN]daily maximumreport only (ug/L)all year
Arsenic, total recoverabledaily maximumreport only (ug/L)all year
Arsenic, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverabledaily maximumreport only (ug/L)all year
Thallium, total recoverabledaily maximumreport only (ug/L)all year
Thallium, total recoverabledaily maximumreport only (ug/L)all year
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year
Chromium, trivalent [as Cr]daily maximumreport only (ug/L)all year
Chromium, trivalent [as Cr]daily maximumreport only (ug/L)all year
Nickel, total recoverabledaily maximumreport only (ug/L)all year
Nickel, total recoverabledaily maximumreport only (ug/L)all year
Silver total recoverabledaily maximumreport only (ug/L)all year
Silver total recoverabledaily maximumreport only (ug/L)all year
Zinc, total recoverabledaily maximumreport only (ug/L)all year
Zinc, total recoverabledaily maximumreport only (ug/L)all year
Cadmium, total recoverabledaily maximumreport only (ug/L)all year
Cadmium, total recoverabledaily maximumreport only (ug/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Antimony, total recoverabledaily maximumreport only (ug/L)all year
Antimony, total recoverabledaily maximumreport only (ug/L)all year
Radiation, gross betadaily maximumreport only (pCi/L)all year
Radiation, gross betadaily maximumreport only (pCi/L)all year
Oil and greasemonthly average≤ 25 mg/Lall year
Oil and greasemonthly average≤ 25 mg/Lall year
Oil and greaseweekly average≤ 40 mg/Lall year
Oil and greaseweekly average≤ 40 mg/Lall year
Oil and greaseinstantaneous maximum≤ 75 mg/Lall year
Oil and greaseinstantaneous maximum≤ 75 mg/Lall year
Oil and greasemonthly average≤ 4000 lb/dall year
Oil and greasemonthly average≤ 4000 lb/dall year
Oil and greaseweekly average≤ 6400 lb/dall year
Oil and greaseweekly average≤ 6400 lb/dall year
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all year
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all year
Tributyltindaily maximumreport only (ug/L)all year
Tributyltindaily maximumreport only (ug/L)all year
Tritium, totaldaily maximumreport only (pCi/L)all year
Tritium, totaldaily maximumreport only (pCi/L)all year
Radium 226 + radium 228, totaldaily maximumreport only (pCi/L)all year
Radium 226 + radium 228, totaldaily maximumreport only (pCi/L)all year
Strontium 90, totaldaily maximumreport only (pCi/L)all year
Strontium 90, totaldaily maximumreport only (pCi/L)all year
Polynuclear Aromatic Hydrocarbons [PAHs]daily maximumreport only (ug/L)all year
Polynuclear Aromatic Hydrocarbons [PAHs]daily maximumreport only (ug/L)all year
Uranium, total [in pci/L]daily maximumreport only (pCi/L)all year
Uranium, total [in pci/L]daily maximumreport only (pCi/L)all year
Dichlorobromomethanedaily maximumreport only (ug/L)all year
Dichlorobromomethanedaily maximumreport only (ug/L)all year
Carbon tetrachloridedaily maximumreport only (ug/L)all year
Carbon tetrachloridedaily maximumreport only (ug/L)all year
1,2-Dichloroethanedaily maximumreport only (ug/L)all year
1,2-Dichloroethanedaily maximumreport only (ug/L)all year
Dibromochloromethanedaily maximumreport only (ug/L)all year
Dibromochloromethanedaily maximumreport only (ug/L)all year
Chloroformdaily maximumreport only (ug/L)all year
Chloroformdaily maximumreport only (ug/L)all year
Toluenedaily maximumreport only (ug/L)all year
Toluenedaily maximumreport only (ug/L)all year
Benzenedaily maximumreport only (ug/L)all year
Benzenedaily maximumreport only (ug/L)all year
Acroleindaily maximumreport only (ug/L)all year
Acroleindaily maximumreport only (ug/L)all year
Acrylonitriledaily maximumreport only (ug/L)all year
Acrylonitriledaily maximumreport only (ug/L)all year
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all year
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all year
Bis[2-chloroethoxy]methanedaily maximumreport only (ug/L)all year
Bis[2-chloroethoxy]methanedaily maximumreport only (ug/L)all year
Bis[2-chloroisopropyl] etherdaily maximumreport only (ug/L)all year
Bis[2-chloroisopropyl] etherdaily maximumreport only (ug/L)all year
Chlorobenzenedaily maximumreport only (ug/L)all year
Chlorobenzenedaily maximumreport only (ug/L)all year
Diethyl phthalatedaily maximumreport only (ug/L)all year
Diethyl phthalatedaily maximumreport only (ug/L)all year
Dimethyl phthalatedaily maximumreport only (ug/L)all year
Dimethyl phthalatedaily maximumreport only (ug/L)all year
1,2-Diphenylhydrazinedaily maximumreport only (ug/L)all year
1,2-Diphenylhydrazinedaily maximumreport only (ug/L)all year
Ethylbenzenedaily maximumreport only (ug/L)all year
Ethylbenzenedaily maximumreport only (ug/L)all year
Fluoranthenedaily maximumreport only (ug/L)all year
Fluoranthenedaily maximumreport only (ug/L)all year
Hexachlorocyclopentadienedaily maximumreport only (ug/L)all year
Hexachlorocyclopentadienedaily maximumreport only (ug/L)all year
Hexachlorobutadienedaily maximumreport only (ug/L)all year
Hexachlorobutadienedaily maximumreport only (ug/L)all year
Hexachloroethanedaily maximumreport only (ug/L)all year
Hexachloroethanedaily maximumreport only (ug/L)all year
Isophoronedaily maximumreport only (ug/L)all year
Isophoronedaily maximumreport only (ug/L)all year
Methylene chloridedaily maximumreport only (ug/L)all year
Methylene chloridedaily maximumreport only (ug/L)all year
N-Nitrosodi-N-propylaminedaily maximumreport only (ug/L)all year
N-Nitrosodi-N-propylaminedaily maximumreport only (ug/L)all year
N-Nitrosodiphenylaminedaily maximumreport only (ug/L)all year
N-Nitrosodiphenylaminedaily maximumreport only (ug/L)all year
N-Nitrosodimethylamine [NDMA]daily maximumreport only (ug/L)all year
N-Nitrosodimethylamine [NDMA]daily maximumreport only (ug/L)all year
Nitrobenzenedaily maximumreport only (ug/L)all year
Nitrobenzenedaily maximumreport only (ug/L)all year
Tetrachloroethylenedaily maximumreport only (ug/L)all year
Tetrachloroethylenedaily maximumreport only (ug/L)all year
1,1-Dichloroethylenedaily maximumreport only (ug/L)all year
1,1-Dichloroethylenedaily maximumreport only (ug/L)all year
1,1,1-Trichloroethanedaily maximumreport only (ug/L)all year
1,1,1-Trichloroethanedaily maximumreport only (ug/L)all year
1,1,2-Trichloroethanedaily maximumreport only (ug/L)all year
1,1,2-Trichloroethanedaily maximumreport only (ug/L)all year
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)all year
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)all year
1,4-Dichlorobenzenedaily maximumreport only (ug/L)all year
1,4-Dichlorobenzenedaily maximumreport only (ug/L)all year
2,4-Dinitrotoluenedaily maximumreport only (ug/L)all year
2,4-Dinitrotoluenedaily maximumreport only (ug/L)all year
2,4-Dinitrophenoldaily maximumreport only (ug/L)all year
2,4-Dinitrophenoldaily maximumreport only (ug/L)all year
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all year
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all year
3,3'-Dichlorobenzidinedaily maximumreport only (ug/L)all year
3,3'-Dichlorobenzidinedaily maximumreport only (ug/L)all year
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all year
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all year
Di-n-butyl phthalatedaily maximumreport only (ug/L)all year
Di-n-butyl phthalatedaily maximumreport only (ug/L)all year
Benzidinemonthly average≤ .005 ug/Lall year
Benzidinemonthly average≤ .005 ug/Lall year
Benzidinemonthly average≤ .0008 lb/dall year
Benzidinemonthly average≤ .0008 lb/dall year
Vinyl chloridedaily maximumreport only (ug/L)all year
Vinyl chloridedaily maximumreport only (ug/L)all year
Trichloroethylenedaily maximumreport only (ug/L)all year
Trichloroethylenedaily maximumreport only (ug/L)all year
Aldrindaily maximumreport only (ug/L)all year
Aldrindaily maximumreport only (ug/L)all year
Chlordane [tech mix. and metabolites]monthly average≤ .0017 ug/Lall year
Chlordane [tech mix. and metabolites]monthly average≤ .0017 ug/Lall year
Chlordane [tech mix. and metabolites]monthly average≤ .00027 lb/dall year
Chlordane [tech mix. and metabolites]monthly average≤ .00027 lb/dall year
DDT/DDD/DDE, sum of p,p' & o,p' isomersdaily maximumreport only (ug/L)all year
DDT/DDD/DDE, sum of p,p' & o,p' isomersdaily maximumreport only (ug/L)all year
Dieldrindaily maximumreport only (ug/L)all year
Dieldrindaily maximumreport only (ug/L)all year
Endosulfan, totaldaily maximumreport only (ug/L)all year
Endosulfan, totaldaily maximumreport only (ug/L)all year
Endrindaily maximumreport only (ug/L)all year
Endrindaily maximumreport only (ug/L)all year
Toxaphenemonthly average≤ .015 ug/Lall year
Toxaphenemonthly average≤ .015 ug/Lall year
Toxaphenemonthly average≤ .0024 lb/dall year
Toxaphenemonthly average≤ .0024 lb/dall year
Heptachlordaily maximumreport only (ug/L)all year
Heptachlordaily maximumreport only (ug/L)all year
Heptachlor epoxidedaily maximumreport only (ug/L)all year
Heptachlor epoxidedaily maximumreport only (ug/L)all year
Polychlorinated biphenyls [PCBs]monthly average≤ .0014 ug/Lall year
Polychlorinated biphenyls [PCBs]monthly average≤ .0014 ug/Lall year
Polychlorinated biphenyls [PCBs]monthly average≤ .00022 lb/dall year
Polychlorinated biphenyls [PCBs]monthly average≤ .00022 lb/dall year
Hexachlorobenzenemonthly average≤ .015 ug/Lall year
Hexachlorobenzenemonthly average≤ .015 ug/Lall year
Hexachlorobenzenemonthly average≤ .0024 lb/dall year
Hexachlorobenzenemonthly average≤ .0024 lb/dall year
Flow, in conduit or thru treatment planttotalreport only (MGD)all year
Flow, in conduit or thru treatment planttotalreport only (MGD)all year
Chlorine, total residual6-month median≤ 150 ug/Lall year
Chlorine, total residual6-month median≤ 150 ug/Lall year
Chlorine, total residualdaily maximum≤ 580 ug/Lall year
Chlorine, total residualdaily maximum≤ 580 ug/Lall year
Chlorine, total residualinstantaneous maximum≤ 4400 ug/Lall year
Chlorine, total residualinstantaneous maximum≤ 4400 ug/Lall year
Chlorine, total residual6-month median≤ 24 lb/dall year
Chlorine, total residual6-month median≤ 24 lb/dall year
Chlorine, total residualdaily maximum≤ 92 lb/dall year
Chlorine, total residualdaily maximum≤ 92 lb/dall year
Enterococcigeometric mean≤ 30 CFU/100mLall year
Enterococcigeometric mean≤ 30 CFU/100mLall year
Enterococci90% of samples≤ 110 CFU/100mLall year
Enterococci90% of samples≤ 110 CFU/100mLall year
Mercury, total recoverabledaily maximumreport only (ug/L)all year
Mercury, total recoverabledaily maximumreport only (ug/L)all year
Phenols, chlorinateddaily maximumreport only (ug/L)all year
Phenols, chlorinateddaily maximumreport only (ug/L)all year
Coliform, fecal general30-day geometric mean≤ 200 CFU/100mLall year
Coliform, fecal general30-day geometric mean≤ 200 CFU/100mLall year
Coliform, fecal generalsingle sample≤ 400 CFU/100mLall year
Coliform, fecal generalsingle sample≤ 400 CFU/100mLall year
Coliform, total generalmedian≤ 70 CFU/100mLall year
Coliform, total generalmedian≤ 70 CFU/100mLall year
Coliform, total general90% of samples≤ 230 CFU/100mLall year
Coliform, total general90% of samples≤ 230 CFU/100mLall year
1,3-Dichloropropenedaily maximumreport only (ug/L)all year
1,3-Dichloropropenedaily maximumreport only (ug/L)all year
Hexachlorocyclohexane, totaldaily maximumreport only (ug/L)all year
Hexachlorocyclohexane, totaldaily maximumreport only (ug/L)all year
Phenolic compounds, unchlorinateddaily maximumreport only (ug/L)all year
Phenolic compounds, unchlorinateddaily maximumreport only (ug/L)all year
Halomethanesdaily maximumreport only (ug/L)all year
Halomethanesdaily maximumreport only (ug/L)all year
Dichlorobenzenedaily maximumreport only (ug/L)all year
Dichlorobenzenedaily maximumreport only (ug/L)all year
Radiation, gross alphadaily maximumreport only (pCi/L)all year
Radiation, gross alphadaily maximumreport only (pCi/L)all year
TCDD equivalentsmonthly average≤ .00000028 ug/Lall year
TCDD equivalentsmonthly average≤ .00000028 ug/Lall year
TCDD equivalentsmonthly average≤ .045 ulb/dall year
TCDD equivalentsmonthly average≤ .045 ulb/dall year
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinisvalue< 1 pass=0;fail=1all year
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinisvalue< 1 pass=0;fail=1all year
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinismaximumreport only (% effect)all year
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinismaximumreport only (% effect)all year
Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensvalue< 1 pass=0;fail=1all year
Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensvalue< 1 pass=0;fail=1all year
Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensmaximumreport only (% effect)all year
Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensmaximumreport only (% effect)all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusvalue< 1 pass=0;fail=1all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusvalue< 1 pass=0;fail=1all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusmaximumreport only (% effect)all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusmaximumreport only (% effect)all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusvalue< 1 pass=0;fail=1all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusvalue< 1 pass=0;fail=1all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusmaximumreport only (% effect)all year
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusmaximumreport only (% effect)all year
Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferavalue< 1 pass=0;fail=1all year
Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferavalue< 1 pass=0;fail=1all year
Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferamaximumreport only (% effect)all year
Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferamaximumreport only (% effect)all year
Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferavalue≤ 1 pass=0;fail=1all year
Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferavalue≤ 1 pass=0;fail=1all year
Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferamaximumreport only (% effect)all year
Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferamaximumreport only (% effect)all year

How strict are these limits?

Cited limits by parameter: California's rules and the federal ones.

Same industry: the 11 Water Supply permits in California.

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