Sonoma Valley County Sanitation District

NPDES permit CA0037800 · Major POTW · effective, expires 2030-01-31 · 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

6values over a limit
0required values missing, on 0 form(s)
0of 42 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (3), Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia (2), Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia (1).

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (196)

OutfallParameterStatisticLimitMonths
EFF1BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFF1BOD, 5-day, 20 deg. CWKLY AVG <= 20 mg/L all year
EFF1pHINST MIN >= 6.5 SU all year
EFF1pHINST MAX <= 8.5 SU all year
EFF1Solids, total suspendedMO AVG <= 10 mg/L all year
EFF1Solids, total suspendedWKLY AVG <= 20 mg/L all year
EFF1Nitrogen, ammonia total [as N]MO AVG <= 1.8 mg/L all year
EFF1Nitrogen, ammonia total [as N]DAILY MX report only all year
EFF1Nitrogen, ammonia total [as N]MO AVG report only all year
EFF1Nitrogen, ammonia total [as N]DAILY MX report only all year
EFF1Nitrite + Nitrate total [as N]MO AVG report only all year
EFF1Nitrite + Nitrate total [as N]DAILY MX report only all year
EFF1Nitrite + Nitrate total [as N]MO AVG report only all year
EFF1Nitrite + Nitrate total [as N]DAILY MX report only all year
EFF1Nitrogen, inorganic totalMO AVG report only all year
EFF1Nitrogen, inorganic totalDAILY MX report only all year
EFF1Nitrogen, inorganic totalMO AVG report only all year
EFF1Nitrogen, inorganic totalDAILY MX report only all year
EFF1Phosphorus, total [as P]MO AVG report only all year
EFF1Phosphorus, total [as P]DAILY MX report only all year
EFF1Phosphorus, total [as P]MO AVG report only all year
EFF1Phosphorus, total [as P]DAILY MX report only all year
EFF1Cyanide, total [as CN]DAILY MX report only all year
EFF1AsbestosDAILY MX report only all year
EFF1Arsenic, total recoverableDAILY MX report only all year
EFF1Selenium, 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
EFF1Nickel, total recoverableMO AVG <= 6.8 ug/L all year
EFF1Nickel, total recoverableDAILY MX report only all year
EFF1Nickel, total recoverableDAILY MX <= 10 ug/L all year
EFF1Silver total recoverableDAILY MX report only all year
EFF1Zinc, 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
EFF1Chromium, total recoverableDAILY MX report only all year
EFF1Copper, total recoverableMO AVG <= 5.5 ug/L all year
EFF1Copper, total recoverableDAILY MX report only all year
EFF1Copper, total recoverableDAILY MX <= 11 ug/L all year
EFF1Antimony, total recoverableDAILY MX report only all year
EFF1Oil and greaseMO AVG <= 10 mg/L all year
EFF1Oil and greaseDAILY MX <= 20 mg/L all year
EFF12-Methyl-4,6-dinitrophenolDAILY 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
EFF1BromoformDAILY 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
EFF1.delta.-BHCDAILY MX report only all year
EFF1AcenaphthyleneDAILY MX report only all year
EFF1AcenaphtheneDAILY MX report only all year
EFF1AcroleinDAILY MX report only all year
EFF1AcrylonitrileDAILY MX report only all year
EFF1AnthraceneDAILY MX report only all year
EFF1Benzo[b]fluorantheneDAILY MX report only all year
EFF1Benzo[k]fluorantheneDAILY MX report only all year
EFF1Benzo[a]pyreneDAILY 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
EFF1Butyl benzyl phthalateDAILY MX report only all year
EFF1ChlorobenzeneDAILY MX report only all year
EFF1ChryseneDAILY 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
EFF1Endosulfan sulfateDAILY MX report only all year
EFF1.beta.-EndosulfanDAILY MX report only all year
EFF1.alpha.-EndosulfanDAILY MX report only all year
EFF1Endrin aldehydeDAILY MX report only all year
EFF1EthylbenzeneDAILY MX report only all year
EFF1FluorantheneDAILY MX report only all year
EFF1FluoreneDAILY MX report only all year
EFF1HexachlorocyclopentadieneDAILY MX report only all year
EFF1HexachlorobutadieneDAILY MX report only all year
EFF1HexachloroethaneDAILY MX report only all year
EFF1Indeno[1,2,3-cd]pyreneDAILY MX report only all year
EFF1IsophoroneDAILY MX report only all year
EFF1Methyl bromide [Bromomethane]DAILY MX report only all year
EFF1Methyl chloride [Chloromethane]DAILY 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
EFF1PhenanthreneDAILY MX report only all year
EFF1PyreneDAILY MX report only all year
EFF1TetrachloroethyleneDAILY MX report only all year
EFF11,1-DichloroethaneDAILY 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
EFF1Benzo[ghi]peryleneDAILY MX report only all year
EFF1Benzo[a]anthraceneDAILY MX report only all year
EFF11,2-DichlorobenzeneDAILY MX report only all year
EFF11,2-DichloropropaneDAILY MX report only all year
EFF1trans-1,2-DichloroethyleneDAILY MX report only all year
EFF11,2,4-TrichlorobenzeneDAILY MX report only all year
EFF1Dibenz[a,h]anthraceneDAILY MX report only all year
EFF11,3-DichlorobenzeneDAILY MX report only all year
EFF11,4-DichlorobenzeneDAILY MX report only all year
EFF12-Chloroethyl vinyl ether, [mixed]DAILY MX report only all year
EFF12-ChloronaphthaleneDAILY MX report only all year
EFF12-ChlorophenolDAILY MX report only all year
EFF12-NitrophenolDAILY MX report only all year
EFF1Di-n-octyl phthalateDAILY MX report only all year
EFF12,4-DichlorophenolDAILY MX report only all year
EFF12,4-DimethylphenolDAILY 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
EFF12,6-DinitrotolueneDAILY MX report only all year
EFF13,3'-DichlorobenzidineDAILY MX report only all year
EFF14-Bromophenyl phenyl etherDAILY MX report only all year
EFF14-Chlorophenyl phenyl etherDAILY MX report only all year
EFF14-NitrophenolDAILY MX report only all year
EFF1PCB-1016DAILY MX report only all year
EFF12,3,7,8-Tetrachlorodibenzo-p-dioxinDAILY MX report only all year
EFF1PhenolDAILY MX report only all year
EFF1NaphthaleneDAILY MX report only all year
EFF1PentachlorophenolDAILY MX report only all year
EFF1Di[2-ethylhexyl] phthalate [DEHP]DAILY 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
EFF14,4'-DDTDAILY MX report only all year
EFF14,4'-DDDDAILY MX report only all year
EFF14,4'-DDEDAILY MX report only all year
EFF1AldrinDAILY MX report only all year
EFF1.alpha.-BHCDAILY MX report only all year
EFF1.beta.-BHCDAILY MX report only all year
EFF1.gamma.-BHCDAILY MX report only all year
EFF1Chlordane [tech mix. and metabolites]DAILY MX report only all year
EFF1DieldrinDAILY 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
EFF1PCB-1221DAILY MX report only all year
EFF1PCB-1232DAILY MX report only all year
EFF1PCB-1242DAILY MX report only all year
EFF1PCB-1248DAILY MX report only all year
EFF1PCB-1254DAILY MX report only all year
EFF1PCB-1260DAILY MX report only all year
EFF1HexachlorobenzeneDAILY MX report only all year
EFF1Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF1Chlorine, total residual1I <= .013 mg/L all year
EFF1Flow, totalMO TOTAL report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of congenersMO AVG report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of congenersWKLY AVG report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of AroclorsMO AVG <= .012 ug/L all year
EFF1Polychlorinated biphenyls [PCBs], sum of AroclorsDAILY MX <= .017 ug/L all year
EFF14-Chloro-3-methylphenolDAILY MX report only all year
EFF1Mercury, total recoverableDAILY MX report only all year
EFF1Mercury, total recoverableMO AVG <= .066 ug/L all year
EFF1Mercury, total recoverableWKLY AVG <= .072 ug/L all year
EFF1Mercury, total recoverableANNL AVG <= .041 kg/yr all year
EFF11,3-DichloropropeneDAILY MX report only all year
EFF1BOD, 5-day, percent removalMO AV MN >= 85 % all year
EFF1Solids, suspended percent removalMO AV MN >= 85 % all year
EFF1TCDD equivalentsMO AVG <= .000014 ng/L all year
EFF1TCDD equivalentsDAILY MX <= .000028 ng/L all year
EFF1ChloroethaneDAILY MX report only all year
EFF1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 0 pass=0;fail=1 all year
EFF1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO MED <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaDAILY MX <= 50 % effect all year
EFF2Cyanide, total [as CN]MO AVG <= 4 ug/L all year
EFF2Cyanide, total [as CN]DAILY MX <= 8.1 ug/L all year
EFF2EnterococciGEO MEAN <= 30 CFU/100mL all year
EFF2Enterococci90TH % <= 110 CFU/100mL all year
EFF3Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF3Flow, totalMO TOTAL report only all year
EFF4Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF4Flow, totalMO TOTAL report only all year
EFF5Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF5Flow, totalMO TOTAL report only all year
EFF6Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF6Flow, totalMO TOTAL report only all year
EFF7Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF7Flow, totalMO TOTAL 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
INF1Solids, total suspendedMO AVG report only all year
INF1Solids, total suspendedDAILY MX report only all year
INF1Cyanide, total [as CN]DAILY MX report only all year
INF1Flow, in conduit or thru treatment plantDAILY AV report only all year
INF1Flow, totalMO TOTAL report only all year

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