West Basin Municipal Water District

NPDES permit CA0063401 · Major NON-POTW · effective, expires 2029-01-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
0of 14 forms filed late

Last period with anything received: 2026-03-31.

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 (153)

OutfallParameterStatisticLimitMonths
EFF1Temperature, water deg. fahrenheitINST MAX <= 100 deg F all year
EFF1TurbidityMO AVG <= 75 NTU all year
EFF1TurbidityWKLY AVG <= 100 NTU all year
EFF1TurbidityINST MAX <= 225 NTU all year
EFF1pHINST MIN >= 6 SU all year
EFF1pHINST MAX <= 9 SU all year
EFF1SalinityDAILY MX report only all year
EFF1Solids, total suspendedMO AVG <= 60 mg/L all year
EFF1Solids, total suspendedMO AVG <= 2600 lb/d all year
EFF1Solids, settleableMO AVG <= 1 mL/L all year
EFF1Solids, settleableWKLY AVG <= 1.5 mL/L all year
EFF1Solids, settleableINST MAX <= 3 mL/L all year
EFF1Nitrogen, total [as N]DAILY MX report only all year
EFF1Nitrogen, total [as N]DAILY AV report only all year
EFF1Nitrogen, total [as N]AL report only all year
EFF1Nitrogen, total [as N]DAILY AV report only all year
EFF1Nitrogen, organic total [as N]DAILY MX report only all year
EFF1Nitrogen, ammonia total [as N]DAILY MX <= 7500 mg/L all year
EFF1Nitrogen, ammonia total [as N]INST MAX <= 23330 mg/L all year
EFF1Nitrogen, ammonia total [as N]6A <= 282 mg/L all year
EFF1Nitrogen, ammonia total [as N]DAILY MX <= 325000 lb/d all year
EFF1Nitrogen, ammonia total [as N]6A <= 12000 lb/d all year
EFF1Nitrogen, nitrite total [as N]DAILY MX report only all year
EFF1Nitrogen, nitrate total [as N]DAILY MX report only all year
EFF1Phosphorus, total [as P]DAILY MX report only all year
EFF1Cyanide, total [as CN]DAILY MX report only all year
EFF1Arsenic, total recoverableDAILY MX report only all year
EFF1Selenium, total recoverableDAILY MX report only all year
EFF1Thallium, total recoverableDAILY MX report only all year
EFF1Beryllium, total recoverable [as Be]DAILY MX report only all year
EFF1Chromium, hexavalent [as Cr]DAILY MX report only all year
EFF1Chromium, trivalent [as Cr]DAILY MX report only all year
EFF1Chromium, total [as Cr]DAILY MX report only all year
EFF1Nickel, total recoverableDAILY MX report only all year
EFF1Silver total recoverableDAILY MX report only all year
EFF1Zinc, total recoverableDAILY MX report only all year
EFF1Cadmium, total recoverableDAILY MX report only all year
EFF1Lead, total recoverableDAILY MX report only all year
EFF1Copper, total recoverableDAILY MX report only all year
EFF1Antimony, total recoverableDAILY MX report only all year
EFF1Radiation, gross betaDAILY MX report only all year
EFF1Oil and greaseMO AVG <= 25 mg/L all year
EFF1Oil and greaseWKLY AVG <= 40 mg/L all year
EFF1Oil and greaseINST MAX <= 75 mg/L all year
EFF1Oil and greaseMO AVG <= 1080 lb/d all year
EFF1Oil and greaseWKLY AVG <= 1730 lb/d all year
EFF12-Methyl-4,6-dinitrophenolDAILY MX report only all year
EFF1TributyltinDAILY MX report only all year
EFF1Tritium, totalDAILY MX report only all year
EFF1Radium 226 + radium 228, totalDAILY MX report only all year
EFF1Strontium 90, totalDAILY MX report only all year
EFF1Polynuclear Aromatic Hydrocarbons [PAHs]DAILY MX report only all year
EFF1Uranium, total [in pci/L]DAILY MX report only all year
EFF11,2,3,7,8-Pentachlorodibenzo-p-dioxinDAILY MX report only all year
EFF11,2,3,4,7,8-Hexachlorodibenzo-p-dioxinDAILY MX report only all year
EFF11,2,3,6,7,8-Hexachlorodibenzo-p-dioxinDAILY MX report only all year
EFF11,2,3,7,8,9-Hexachlorodibenzo-p-dioxinDAILY MX report only all year
EFF11,2,3,7,8-PentachlorodibenzofuranDAILY MX report only all year
EFF12,3,4,7,8-PentachlorodibenzofuranDAILY MX report only all year
EFF11,2,3,4,7,8-HexachlorodibenzofuranDAILY MX report only all year
EFF11,2,3,6,7,8-HexachlorodibenzofuranDAILY MX report only all year
EFF11,2,3,7,8,9-HexachlorodibenzofuranDAILY MX report only all year
EFF12,3,4,6,7,8-HexachlorodibenzofuranDAILY MX report only all year
EFF11,2,3,4,6,7,8-HeptachlorodibenzofuranDAILY MX report only all year
EFF11,2,3,4,7,8,9-HeptachlorodibenzofuranDAILY MX report only all year
EFF11,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxinDAILY MX report only all year
EFF1DichlorobromomethaneDAILY MX report only all year
EFF1Carbon tetrachlorideDAILY MX report only all year
EFF11,2-DichloroethaneDAILY MX report only all year
EFF1DibromochloromethaneDAILY MX report only all year
EFF1ChloroformDAILY MX report only all year
EFF1TolueneDAILY MX report only all year
EFF1BenzeneDAILY MX report only all year
EFF1AcroleinDAILY MX report only all year
EFF1AcrylonitrileDAILY MX report only all year
EFF1Bis[2-chloroethyl] etherDAILY MX report only all year
EFF1Bis[2-chloroethoxy]methaneDAILY MX report only all year
EFF1Bis[2-chloroisopropyl] etherDAILY MX report only all year
EFF1ChlorobenzeneDAILY MX report only all year
EFF1Diethyl phthalateDAILY MX report only all year
EFF1Dimethyl phthalateDAILY MX report only all year
EFF11,2-DiphenylhydrazineDAILY MX report only all year
EFF1EthylbenzeneDAILY MX report only all year
EFF1FluorantheneDAILY MX report only all year
EFF1HexachlorocyclopentadieneDAILY MX report only all year
EFF1HexachlorobutadieneDAILY MX report only all year
EFF1HexachloroethaneDAILY MX report only all year
EFF1IsophoroneDAILY MX report only all year
EFF1Methylene chlorideDAILY MX report only all year
EFF1N-Nitrosodi-N-propylamineDAILY MX report only all year
EFF1N-NitrosodiphenylamineDAILY MX report only all year
EFF1N-Nitrosodimethylamine [NDMA]DAILY MX report only all year
EFF1NitrobenzeneDAILY MX report only all year
EFF1TetrachloroethyleneDAILY MX report only all year
EFF11,1-DichloroethyleneDAILY MX report only all year
EFF11,1,1-TrichloroethaneDAILY MX report only all year
EFF11,1,2-TrichloroethaneDAILY MX report only all year
EFF11,1,2,2-TetrachloroethaneDAILY MX report only all year
EFF11,4-DichlorobenzeneDAILY MX report only all year
EFF12,4-DinitrotolueneDAILY MX report only all year
EFF12,4-DinitrophenolDAILY MX report only all year
EFF12,4,6-TrichlorophenolDAILY MX report only all year
EFF13,3'-DichlorobenzidineDAILY MX report only all year
EFF12,3,7,8-Tetrachlorodibenzo-p-dioxinDAILY MX report only all year
EFF12,3,7,8-TetrachlorodibenzofuranDAILY MX report only all year
EFF1Di-n-butyl phthalateDAILY MX report only all year
EFF1BenzidineDAILY MX report only all year
EFF1Vinyl chlorideDAILY MX report only all year
EFF1TrichloroethyleneDAILY MX report only all year
EFF1AldrinDAILY MX report only all year
EFF1Chlordane [tech mix. and metabolites]DAILY MX report only all year
EFF1DDT/DDD/DDE, sum of p,p' & o,p' isomersDAILY MX report only all year
EFF1DDT/DDD/DDE, sum of p,p' & o,p' isomersAL report only all year
EFF1DieldrinDAILY MX report only all year
EFF1Endosulfan, totalDAILY MX report only all year
EFF1EndrinDAILY MX report only all year
EFF1ToxapheneDAILY MX report only all year
EFF1HeptachlorDAILY MX report only all year
EFF1Heptachlor epoxideDAILY MX report only all year
EFF1HexachlorobenzeneDAILY MX report only all year
EFF1Flow, in conduit or thru treatment plantMO AVG report only all year
EFF1Flow, in conduit or thru treatment plantINST MAX report only all year
EFF1Chlorine, total residualDAILY MX <= 32000 ug/L all year
EFF1Chlorine, total residualINST MAX <= 239000 ug/L all year
EFF1Chlorine, total residual6A <= 8000 ug/L all year
EFF1Chlorine, total residualDAILY MX <= 1400 lb/d all year
EFF1Chlorine, total residual6A <= 350 lb/d all year
EFF1Flow, totalDAILY MX report only all year
EFF1Flow, totalTOTAL report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of congenersDAILY MX report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of AroclorsDAILY MX report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of AroclorsAL report only all year
EFF1Octachlorodibenzo-p-dioxinDAILY MX report only all year
EFF1OctachlorodibenzofuranDAILY MX report only all year
EFF1Mercury, total recoverableDAILY MX report only all year
EFF1Phenols, chlorinatedDAILY MX report only all year
EFF11,3-DichloropropeneDAILY MX report only all year
EFF1Hexachlorocyclohexane, totalDAILY MX report only all year
EFF1Phenolic compounds, unchlorinatedDAILY MX report only all year
EFF1HalomethanesDAILY MX report only all year
EFF1DichlorobenzeneDAILY MX report only all year
EFF1Radiation, gross alphaDAILY MX report only all year
EFF1TCDD equivalentsDAILY MX report only all year
EFF1PFAS SumDAILY MX report only all year
EFF1PFAS SumDAILY MX report only all year
EFF1PFAS SumAL report only all year
EFF1Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaDAILY MX <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaMO MED <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaDAILY MX <= 50 % effect all year
INF1Nitrogen, ammonia total [as N]DAILY MX report only all year
INF1Flow, in conduit or thru treatment plantMO AVG report only all year
INF1Flow, in conduit or thru treatment plantINST MAX report only all year
INF1Flow, totalTOTAL 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