Mendocino City Community Services District

NPDES permit CA0022870 · Minor POTW · effective, expires 2027-09-30 · 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

1values over a limit
0required values missing, on 0 form(s)
0of 25 forms filed late

Last period with anything received: 2026-06-30. Most often over: TCDD equivalents (1).

Reporting

Reports are due about 60 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (141)

OutfallParameterStatisticLimitMonths
001TurbidityMO AVG <= 75 NTU all year
001TurbidityWKLY AVG <= 100 NTU all year
001TurbidityINST MAX <= 225 NTU all year
001RadioactivityDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, settleableMO AVG <= 1 mL/L all year
001Solids, settleableWKLY AVG <= 1.5 mL/L all year
001Solids, settleableINST MAX <= 3 mL/L all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Cyanide, total [as CN]DAILY MX report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Selenium, total recoverableDAILY MX report only all year
001Thallium, total recoverableDAILY MX report only all year
001Beryllium, total recoverable [as Be]DAILY MX report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Chromium, trivalent [as Cr]DAILY MX report only all year
001Nickel, total recoverableDAILY MX report only all year
001Silver total recoverableDAILY MX report only all year
001Zinc, total recoverableDAILY MX report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverableDAILY MX report only all year
001Copper, total recoverableDAILY MX report only all year
001Antimony, total recoverableDAILY MX report only all year
001Oil and greaseMO AVG <= 25 mg/L all year
001Oil and greaseWKLY AVG <= 40 mg/L all year
001Oil and greaseINST MAX <= 75 mg/L all year
0012-Methyl-4,6-dinitrophenolDAILY MX report only all year
0011,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxinDAILY MX report only all year
001TributyltinDAILY MX report only all year
001Polynuclear Aromatic Hydrocarbons [PAHs]DAILY MX report only all year
0011,2,3,7,8-Pentachlorodibenzo-p-dioxinDAILY MX report only all year
0011,2,3,4,7,8-Hexachlorodibenzo-p-dioxinDAILY MX report only all year
0011,2,3,6,7,8-Hexachlorodibenzo-p-dioxinDAILY MX report only all year
0011,2,3,7,8,9-Hexachlorodibenzo-p-dioxinDAILY MX report only all year
0011,2,3,7,8-PentachlorodibenzofuranDAILY MX report only all year
0012,3,4,7,8-PentachlorodibenzofuranDAILY MX report only all year
0011,2,3,4,7,8-HexachlorodibenzofuranDAILY MX report only all year
0011,2,3,6,7,8-HexachlorodibenzofuranDAILY MX report only all year
0011,2,3,7,8,9-HexachlorodibenzofuranDAILY MX report only all year
0012,3,4,6,7,8-HexachlorodibenzofuranDAILY MX report only all year
0011,2,3,4,6,7,8-HeptachlorodibenzofuranDAILY MX report only all year
0011,2,3,4,7,8,9-HeptachlorodibenzofuranDAILY MX report only all year
0011,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxinDAILY MX report only all year
001DichlorobromomethaneDAILY MX report only all year
001Carbon tetrachlorideDAILY MX report only all year
0011,2-DichloroethaneDAILY MX report only all year
001DibromochloromethaneDAILY MX report only all year
001ChloroformDAILY MX report only all year
001TolueneDAILY MX report only all year
001BenzeneDAILY MX report only all year
001AcroleinDAILY MX report only all year
001AcrylonitrileDAILY MX report only all year
001Bis[2-chloroethyl] etherDAILY MX report only all year
001Bis[2-chloroethoxy]methaneDAILY MX report only all year
001Bis[2-chloroisopropyl] etherDAILY MX report only all year
001ChlorobenzeneDAILY MX report only all year
001Diethyl phthalateDAILY MX report only all year
001Dimethyl phthalateDAILY MX report only all year
0011,2-DiphenylhydrazineDAILY MX report only all year
001EthylbenzeneDAILY MX report only all year
001FluorantheneDAILY MX report only all year
001HexachlorocyclopentadieneDAILY MX report only all year
001HexachlorobutadieneDAILY MX report only all year
001HexachloroethaneDAILY MX report only all year
001IsophoroneDAILY MX report only all year
001Methylene chlorideDAILY MX report only all year
001N-Nitrosodi-N-propylamineDAILY MX report only all year
001N-NitrosodiphenylamineDAILY MX report only all year
001N-Nitrosodimethylamine [NDMA]DAILY MX report only all year
001NitrobenzeneDAILY MX report only all year
001TetrachloroethyleneDAILY MX report only all year
0011,1-DichloroethyleneDAILY MX report only all year
0011,1,1-TrichloroethaneDAILY MX report only all year
0011,1,2-TrichloroethaneDAILY MX report only all year
0011,1,2,2-TetrachloroethaneDAILY MX report only all year
0011,4-DichlorobenzeneDAILY MX report only all year
0012,4-DinitrotolueneDAILY MX report only all year
0012,4-DinitrophenolDAILY MX report only all year
0012,4,6-TrichlorophenolDAILY MX report only all year
0013,3'-DichlorobenzidineDAILY MX report only all year
0012,3,7,8-Tetrachlorodibenzo-p-dioxinDAILY MX report only all year
0012,3,7,8-TetrachlorodibenzofuranDAILY MX report only all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX report only all year
001Di-n-butyl phthalateDAILY MX report only all year
001BenzidineDAILY MX report only all year
001Vinyl chlorideDAILY MX report only all year
001TrichloroethyleneDAILY MX report only all year
001AldrinDAILY MX report only all year
001Chlordane [tech mix. and metabolites]DAILY MX report only all year
001DDT/DDD/DDE, sum of p,p' & o,p' isomersDAILY MX report only all year
001DieldrinDAILY MX report only all year
001Endosulfan, totalDAILY MX report only all year
001EndrinDAILY MX report only all year
001ToxapheneDAILY MX report only all year
001HeptachlorDAILY MX report only all year
001Heptachlor epoxideDAILY MX report only all year
001HexachlorobenzeneDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual6A <= .2 mg/L all year
001Chlorine, total residualDAILY MX <= .81 mg/L all year
001Chlorine, total residualINST MAX <= 6.06 mg/L all year
001Chlorine, total residualDAILY MX report only all year
0011,2,3,4,6,7,8,9-OctachlorodibenzofuranDAILY MX report only all year
001Polychlorinated biphenyls [PCBs], sum of AroclorsDAILY MX report only all year
001Mercury, total recoverableDAILY MX report only all year
001Phenols, chlorinatedDAILY MX report only all year
001Coliform, total generalMO MED <= 70 MPN/100mL all year
001Coliform, total generalINST MAX <= 230 MPN/100mL all year
0011,3-DichloropropeneDAILY MX report only all year
001Hexachlorocyclohexane, totalDAILY MX report only all year
001Phenolic compounds, unchlorinatedDAILY MX report only all year
001HalomethanesDAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001DichlorobenzeneDAILY MX report only all year
001TCDD equivalentsMO AVG <= .000394 ng/L all year
001Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinisVALUE report only all year
001Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinisMAXIMUM report only all year
001Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensVALUE report only all year
001Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescensMAXIMUM report only all year
001Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr Mytilus sppVALUE report only all year
001Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr Mytilus sppMAXIMUM report only all year
001Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusVALUE report only all year
001Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratusMAXIMUM report only all year
001Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusVALUE report only all year
001Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricusMAXIMUM report only all year
001Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaVALUE report only all year
001Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaMAXIMUM report only all year
001Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaVALUE report only all year
001Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyriferaMAXIMUM report only all year
INFBOD, 5-day, 20 deg. CDAILY MX report only all year
INFSolids, total suspendedDAILY MX report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY MX report only all year

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