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West Basin Municipal Water District

Water Supply, major discharger, Carson, California. NPDES permit CA0064246, in force until Mar 31, 2029. Last 12 months: no values over a limit, 5 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 105 days after each period: outfall EFF1 form A quarterly (20 values), outfall EFF1 form Q quarterly (37 values), outfall INF1 form A quarterly (3 values), outfall INF1 form Q quarterly (1 value), outfall EFF1 form S twice a year, outfall EFF1 form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 8 reports late

Limits in force (131)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximum≤ 100 deg Fall yearEFF1
Turbiditymonthly average≤ 75 NTUall yearEFF1
Turbidityweekly average≤ 100 NTUall yearEFF1
Turbidityinstantaneous maximum≤ 225 NTUall yearEFF1
Radioactivitydaily maximumreport only (pCi/L)all yearEFF1
pHinstantaneous minimum≥ 6 SUall yearEFF1
pHinstantaneous maximum≤ 9 SUall yearEFF1
Salinitydaily maximumreport only (%)all yearEFF1
Solids, total suspendedmonthly average≤ 60 mg/Lall yearEFF1
Solids, total suspendedmonthly average≤ 600 lb/dall yearEFF1
Solids, settleablemonthly average≤ 1 mL/Lall yearEFF1
Solids, settleableweekly average≤ 1.5 mL/Lall yearEFF1
Solids, settleableinstantaneous maximum≤ 3 mL/Lall yearEFF1
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, organic total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearEFF1
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearEFF1
Arsenic, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Selenium, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Thallium, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all yearEFF1
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all yearEFF1
Chromium, trivalent [as Cr]daily maximumreport only (ug/L)all yearEFF1
Nickel, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Silver total recoverabledaily maximumreport only (ug/L)all yearEFF1
Zinc, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Cadmium, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Lead, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Chromium, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Copper, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Antimony, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Radiation, gross betadaily maximumreport only (pCi/L)all yearEFF1
Oil and greasemonthly average≤ 25 mg/Lall yearEFF1
Oil and greaseweekly average≤ 40 mg/Lall yearEFF1
Oil and greaseinstantaneous maximum≤ 75 mg/Lall yearEFF1
Oil and greasemonthly average≤ 250 lb/dall yearEFF1
Oil and greaseinstantaneous maximum≤ 750 lb/dall yearEFF1
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all yearEFF1
Dichloromethanedaily maximumreport only (ug/L)all yearEFF1
Tributyltindaily maximumreport only (ug/L)all yearEFF1
Tritium, totaldaily maximumreport only (pCi/L)all yearEFF1
Radium 226 + radium 228, totaldaily maximumreport only (pCi/L)all yearEFF1
Strontium 90, totaldaily maximumreport only (pCi/L)all yearEFF1
Polynuclear Aromatic Hydrocarbons [PAHs]daily maximumreport only (ug/L)all yearEFF1
Uranium, total [in pci/L]daily maximumreport only (pCi/L)all yearEFF1
Dichlorobromomethanedaily maximumreport only (ug/L)all yearEFF1
Carbon tetrachloridedaily maximumreport only (ug/L)all yearEFF1
1,2-Dichloroethanedaily maximumreport only (ug/L)all yearEFF1
Chloroformdaily maximumreport only (ug/L)all yearEFF1
Toluenedaily maximumreport only (ug/L)all yearEFF1
Benzenedaily maximumreport only (ug/L)all yearEFF1
Acroleindaily maximumreport only (ug/L)all yearEFF1
Acrylonitriledaily maximumreport only (ug/L)all yearEFF1
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all yearEFF1
Bis[2-chloroethoxy]methanedaily maximumreport only (ug/L)all yearEFF1
Bis[2-chloroisopropyl] etherdaily maximumreport only (ug/L)all yearEFF1
Chlorobenzenedaily maximumreport only (ug/L)all yearEFF1
Chlorodibromomethanedaily maximumreport only (ug/L)all yearEFF1
Diethyl phthalatedaily maximumreport only (ug/L)all yearEFF1
Dimethyl phthalatedaily maximumreport only (ug/L)all yearEFF1
1,2-Diphenylhydrazinedaily maximumreport only (ug/L)all yearEFF1
Ethylbenzenedaily maximumreport only (ug/L)all yearEFF1
Fluoranthenedaily maximumreport only (ug/L)all yearEFF1
Hexachlorocyclopentadienedaily maximumreport only (ug/L)all yearEFF1
Hexachlorobutadienedaily maximumreport only (ug/L)all yearEFF1
Hexachloroethanedaily maximumreport only (ug/L)all yearEFF1
Isophoronedaily maximumreport only (ug/L)all yearEFF1
Methylene chloridedaily maximumreport only (ug/L)all yearEFF1
N-Nitrosodi-N-propylaminedaily maximumreport only (ug/L)all yearEFF1
N-Nitrosodiphenylaminedaily maximumreport only (ug/L)all yearEFF1
N-Nitrosodimethylamine [NDMA]daily maximumreport only (ug/L)all yearEFF1
Nitrobenzenedaily maximumreport only (ug/L)all yearEFF1
Tetrachloroethylenedaily maximumreport only (ug/L)all yearEFF1
1,1-Dichloroethylenedaily maximumreport only (ug/L)all yearEFF1
1,1,1-Trichloroethanedaily maximumreport only (ug/L)all yearEFF1
1,1,2-Trichloroethanedaily maximumreport only (ug/L)all yearEFF1
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)all yearEFF1
1,4-Dichlorobenzenedaily maximumreport only (ug/L)all yearEFF1
2,4-Dinitrotoluenedaily maximumreport only (ug/L)all yearEFF1
2,4-Dinitrophenoldaily maximumreport only (ug/L)all yearEFF1
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all yearEFF1
3,3'-Dichlorobenzidinedaily maximumreport only (ug/L)all yearEFF1
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all yearEFF1
Di-n-butyl phthalatedaily maximumreport only (ug/L)all yearEFF1
Benzidinedaily maximumreport only (ug/L)all yearEFF1
Vinyl chloridedaily maximumreport only (ug/L)all yearEFF1
Trichloroethylenedaily maximumreport only (ug/L)all yearEFF1
Aldrindaily maximumreport only (ug/L)all yearEFF1
Chlordane [tech mix. and metabolites]daily maximumreport only (ug/L)all yearEFF1
DDT/DDD/DDE, sum of p,p' & o,p' isomersannual averagereport only (g/yr)all yearEFF1
Dieldrindaily maximumreport only (ug/L)all yearEFF1
Endosulfan, totaldaily maximumreport only (ug/L)all yearEFF1
Endrindaily maximumreport only (ug/L)all yearEFF1
Toxaphenedaily maximumreport only (ug/L)all yearEFF1
Heptachlordaily maximumreport only (ug/L)all yearEFF1
Heptachlor epoxidedaily maximumreport only (ug/L)all yearEFF1
Hexachlorobenzenedaily maximumreport only (ug/L)all yearEFF1
Flow, in conduit or thru treatment planttotalreport only (MGD)all yearEFF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearEFF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearEFF1
Chlorine, total residualdaily maximumreport only (ug/L)all yearEFF1
Polychlorinated biphenyls [PCBs], sum of congenersdaily maximumreport only (pg/L)all yearEFF1
Polychlorinated biphenyls [PCBs], sum of Aroclorsannual averagereport only (g/yr)all yearEFF1
Mercury, total recoverabledaily maximumreport only (ug/L)all yearEFF1
Phenols, chlorinateddaily maximumreport only (ug/L)all yearEFF1
1,3-Dichloropropenedaily maximumreport only (ug/L)all yearEFF1
Hexachlorocyclohexane, totaldaily maximumreport only (ug/L)all yearEFF1
Phenolic compounds, unchlorinateddaily maximumreport only (ug/L)all yearEFF1
Halomethanesdaily maximumreport only (ug/L)all yearEFF1
Dichlorobenzenedaily maximumreport only (ug/L)all yearEFF1
Radiation, gross alphadaily maximumreport only (pCi/L)all yearEFF1
TCDD equivalentsdaily maximumreport only (pg/L)all yearEFF1
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinisdaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinismaximumreport only (% effect)all yearEFF1
Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensdaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensmaximumreport only (% effect)all yearEFF1
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusdaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusmaximumreport only (% effect)all yearEFF1
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusdaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusmaximumreport only (% effect)all yearEFF1
Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferadaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferamaximumreport only (% effect)all yearEFF1
Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferadaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferamaximumreport only (% effect)all yearEFF1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1
Flow, in conduit or thru treatment planttotalreport only (MGD)all yearINF1

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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Your permit document is the final word. As JSON: /api/v1/permits/CA0064246 · MCP: https://passage-data.com/mcp