San Luis Obispo, City of

NPDES permit CA0049224 · Major POTW · effective, expires 2029-08-31 · 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
3required values missing, on 1 form(s)
4of 23 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (3), pH (2), Nitrogen, nitrate total [as N] (1).

Reporting

Reports are due about 30 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (246)

OutfallParameterStatisticLimitMonths
EFFATemperature, water deg. centigradeINST MAX report only all year
EFFATurbidityMO AVG report only all year
EFFATurbidityDAILY MX report only all year
EFFAColorDAILY MX report only all year
EFFAOxygen, dissolved [DO]INST MIN >= 4 mg/L all year
EFFABOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFFABOD, 5-day, 20 deg. CWKLY AVG <= 30 mg/L all year
EFFABOD, 5-day, 20 deg. CDAILY MX <= 50 mg/L all year
EFFABOD, 5-day, 20 deg. CMO AVG <= 425 lb/d all year
EFFABOD, 5-day, 20 deg. CDAILY MX <= 2252 lb/d all year
EFFApHINST MIN >= 7 SU all year
EFFApHINST MAX <= 8.3 SU all year
EFFASolids, total suspendedMO AVG <= 10 mg/L all year
EFFASolids, total suspendedWKLY AVG <= 30 mg/L all year
EFFASolids, total suspendedDAILY MX <= 75 mg/L all year
EFFASolids, total suspendedMO AVG <= 425 lb/d all year
EFFASolids, total suspendedDAILY MX <= 3378 lb/d all year
EFFASolids, settleableMO AVG <= .1 mL/L all year
EFFANitrogen, ammonia total [as N]MO AVG report only all year
EFFANitrogen, ammonia total [as N]DAILY MX report only all year
EFFANitrogen, ammonia, tot unionized [as N]MO AVG <= .025 mg/L all year
EFFANitrogen, nitrite total [as N]MO AVG <= 1 mg/L all year
EFFANitrogen, nitrite total [as N]DAILY MX report only all year
EFFANitrogen, nitrate total [as N]MO AVG <= 10 mg/L all year
EFFANitrogen, nitrate total [as N]DAILY MX report only all year
EFFANitrogen, Kjeldahl, total [as N]DAILY MX report only all year
EFFANitrite + Nitrate total [as N]DAILY MX report only all year
EFFAPhosphate, ortho, dissolved [as P]DAILY MX report only all year
EFFACyanide, total [as CN]DAILY MX report only all year
EFFAHardness, total [as CaCO3]DAILY MX report only all year
EFFASodium, total recoverableANNL AVG <= 50 mg/L all year
EFFASodium, total recoverableANNL AVG <= 196 mg/L all year
EFFAChloride [as Cl]ANNL AVG <= 100 mg/L all year
EFFAChloride [as Cl]ANNL AVG <= 196 mg/L all year
EFFAAsbestosDAILY MX report only all year
EFFAFluoride, total [as F]DAILY MX report only all year
EFFAArsenic, total recoverableDAILY MX report only all year
EFFACobalt, total recoverableDAILY MX report only all year
EFFAIron, total recoverableDAILY MX report only all year
EFFASelenium, total recoverableDAILY MX report only all year
EFFAThallium, total recoverableDAILY MX report only all year
EFFABeryllium, total recoverable [as Be]DAILY MX report only all year
EFFABoron, total recoverableDAILY MX report only all year
EFFABarium, total recoverableDAILY MX report only all year
EFFAChromium, hexavalent [as Cr]DAILY MX report only all year
EFFAChromium, trivalent [as Cr]DAILY MX report only all year
EFFANickel, total recoverableDAILY MX report only all year
EFFASilver total recoverableDAILY MX report only all year
EFFAZinc, total recoverableDAILY MX report only all year
EFFAAluminum, total recoverableDAILY MX report only all year
EFFACadmium, total recoverableDAILY MX report only all year
EFFALead, total recoverableDAILY MX report only all year
EFFACopper, total recoverableDAILY MX report only all year
EFFAVanadium, total recoverableDAILY MX report only all year
EFFAMolybdenum, total recoverableMO AVG <= .01 mg/L all year
EFFAMolybdenum, total recoverableMO AVG <= .024 mg/L all year
EFFALithium, total [as Li]DAILY MX report only all year
EFFAAntimony, total recoverableDAILY MX report only all year
EFFAOil and greaseMO AVG <= 5 mg/L all year
EFFAOil and greaseDAILY MX <= 10 mg/L all year
EFFA2-Methyl-4,6-dinitrophenolDAILY MX report only all year
EFFADichloromethaneDAILY MX report only all year
EFFADiquatDAILY MX report only all year
EFFAManganese, total recoverableDAILY MX report only all year
EFFAMethyl tert-butyl ether [MTBE]DAILY MX report only all year
EFFADinosebDAILY MX report only all year
EFFADichlorobromomethaneMO AVG <= .56 ug/L all year
EFFADichlorobromomethaneDAILY MX report only all year
EFFADichlorobromomethaneDAILY MX <= .96 ug/L all year
EFFACarbon tetrachlorideDAILY MX report only all year
EFFA1,2-DichloroethaneDAILY MX report only all year
EFFABromoformDAILY MX report only all year
EFFADibromochloromethaneMO AVG <= .4 ug/L all year
EFFADibromochloromethaneDAILY MX report only all year
EFFADibromochloromethaneDAILY MX <= .81 ug/L all year
EFFAChloroformMO AVG <= 60 ug/L all year
EFFAChloroformDAILY MX report only all year
EFFAChloroformDAILY MX <= 120.6 ug/L all year
EFFATolueneDAILY MX report only all year
EFFABenzeneDAILY MX report only all year
EFFAMonochlorobenzenesDAILY MX report only all year
EFFA.delta.-BHCDAILY MX report only all year
EFFAAcenaphthyleneDAILY MX report only all year
EFFAAcenaphtheneDAILY MX report only all year
EFFAAcroleinDAILY MX report only all year
EFFAAcrylonitrileDAILY MX report only all year
EFFAAnthraceneDAILY MX report only all year
EFFABenzo[b]fluorantheneDAILY MX report only all year
EFFABenzo[k]fluorantheneDAILY MX report only all year
EFFABenzo[a]pyreneDAILY MX report only all year
EFFABis[2-chloroethyl] etherDAILY MX report only all year
EFFABis[2-chloroethoxy]methaneDAILY MX report only all year
EFFABis[2-chloroisopropyl] etherDAILY MX report only all year
EFFAButyl benzyl phthalateDAILY MX report only all year
EFFAChlorobenzeneDAILY MX report only all year
EFFAChryseneDAILY MX report only all year
EFFADiethyl phthalateDAILY MX report only all year
EFFADimethyl phthalateDAILY MX report only all year
EFFA1,2-DiphenylhydrazineDAILY MX report only all year
EFFAEndosulfan sulfateDAILY MX report only all year
EFFA.beta.-EndosulfanDAILY MX report only all year
EFFA.alpha.-EndosulfanDAILY MX report only all year
EFFAEndrin aldehydeDAILY MX report only all year
EFFAEthylbenzeneDAILY MX report only all year
EFFAFluorantheneDAILY MX report only all year
EFFAFluoreneDAILY MX report only all year
EFFAHexachlorocyclopentadieneDAILY MX report only all year
EFFAHexachlorobutadieneDAILY MX report only all year
EFFAHexachloroethaneDAILY MX report only all year
EFFAIndeno[1,2,3-cd]pyreneDAILY MX report only all year
EFFAIsophoroneDAILY MX report only all year
EFFAMethyl bromide [Bromomethane]DAILY MX report only all year
EFFAMethyl chloride [Chloromethane]DAILY MX report only all year
EFFAMethylene chlorideMO AVG <= 4.7 ug/L all year
EFFAMethylene chlorideDAILY MX report only all year
EFFAMethylene chlorideDAILY MX <= 9.45 ug/L all year
EFFAN-Nitrosodi-N-propylamineDAILY MX report only all year
EFFAN-NitrosodiphenylamineDAILY MX report only all year
EFFAN-Nitrosodimethylamine [NDMA]DAILY MX report only all year
EFFANitrobenzeneDAILY MX report only all year
EFFAPhenanthreneDAILY MX report only all year
EFFAPyreneDAILY MX report only all year
EFFATetrachloroethyleneDAILY MX report only all year
EFFATrichlorofluoromethaneDAILY MX report only all year
EFFA1,1-DichloroethaneDAILY MX report only all year
EFFA1,1-DichloroethyleneDAILY MX report only all year
EFFA1,1,1-TrichloroethaneDAILY MX report only all year
EFFA1,1,2-TrichloroethaneDAILY MX report only all year
EFFA1,1,2,2-TetrachloroethaneDAILY MX report only all year
EFFABenzo[ghi]peryleneDAILY MX report only all year
EFFABenzo[a]anthraceneDAILY MX report only all year
EFFA1,2-DichlorobenzeneDAILY MX report only all year
EFFA1,2-DichloropropaneDAILY MX report only all year
EFFAtrans-1,2-DichloroethyleneDAILY MX report only all year
EFFA1,2,4-TrichlorobenzeneDAILY MX report only all year
EFFADibenz[a,h]anthraceneDAILY MX report only all year
EFFA1,3-DichlorobenzeneDAILY MX report only all year
EFFA1,4-DichlorobenzeneDAILY MX report only all year
EFFA2-Chloroethyl vinyl ether, [mixed]DAILY MX report only all year
EFFA2-ChloronaphthaleneDAILY MX report only all year
EFFA2-ChlorophenolDAILY MX report only all year
EFFA2-NitrophenolDAILY MX report only all year
EFFADi-n-octyl phthalateDAILY MX report only all year
EFFA2,4-DichlorophenolDAILY MX report only all year
EFFA2,4-DimethylphenolDAILY MX report only all year
EFFA2,4-DinitrotolueneDAILY MX report only all year
EFFA2,4-DinitrophenolDAILY MX report only all year
EFFA2,4,6-TrichlorophenolDAILY MX report only all year
EFFA2,6-DinitrotolueneDAILY MX report only all year
EFFA3,3'-DichlorobenzidineDAILY MX report only all year
EFFA4-Bromophenyl phenyl etherDAILY MX report only all year
EFFA4-Chlorophenyl phenyl etherDAILY MX report only all year
EFFA4-NitrophenolDAILY MX report only all year
EFFAPCB-1016DAILY MX report only all year
EFFA2,3,7,8-Tetrachlorodibenzo-p-dioxinDAILY MX report only all year
EFFAPhenolDAILY MX report only all year
EFFANaphthaleneDAILY MX report only all year
EFFABoleroDAILY MX report only all year
EFFASurfactants [MBAS]MO AVG <= .2 mg/L all year
EFFADalaponDAILY MX report only all year
EFFABentazon, totalDAILY MX report only all year
EFFAOxamylDAILY MX report only all year
EFFAPentachlorophenolMO AVG <= .28 ug/L all year
EFFAPentachlorophenolDAILY MX report only all year
EFFAPentachlorophenolDAILY MX <= .56 ug/L all year
EFFAAtrazineDAILY MX report only all year
EFFASimazineDAILY MX report only all year
EFFADi[2-ethylhexyl] phthalate [DEHP]DAILY MX report only all year
EFFADi-n-butyl phthalateDAILY MX report only all year
EFFABenzidineDAILY MX report only all year
EFFAAlachlorDAILY MX report only all year
EFFAVinyl chlorideDAILY MX report only all year
EFFATrichloroethyleneDAILY MX report only all year
EFFA4,4'-DDTDAILY MX report only all year
EFFA4,4'-DDDDAILY MX report only all year
EFFA4,4'-DDEDAILY MX report only all year
EFFAAldrinDAILY MX report only all year
EFFA.alpha.-BHCDAILY MX report only all year
EFFA.beta.-BHCDAILY MX report only all year
EFFA.gamma.-BHCDAILY MX report only all year
EFFAChlordane [tech mix. and metabolites]DAILY MX report only all year
EFFADieldrinDAILY MX report only all year
EFFAEndrinDAILY MX report only all year
EFFAToxapheneDAILY MX report only all year
EFFAHeptachlorDAILY MX report only all year
EFFAHeptachlor epoxideDAILY MX report only all year
EFFAMethoxychlorDAILY MX report only all year
EFFAPCB-1221DAILY MX report only all year
EFFAPCB-1232DAILY MX report only all year
EFFAPCB-1242DAILY MX report only all year
EFFAPCB-1248DAILY MX report only all year
EFFAPCB-1254DAILY MX report only all year
EFFAPCB-1260DAILY MX report only all year
EFFAHexachlorobenzeneDAILY MX report only all year
EFFAPicloramDAILY MX report only all year
EFFA2,4-Dichlorophenoxyacetic acidDAILY MX report only all year
EFFAMolinateDAILY MX report only all year
EFFAFlow, in conduit or thru treatment plantDAILY MX report only all year
EFFAFlow, in conduit or thru treatment plantINST MAX report only all year
EFFAFlow, in conduit or thru treatment plantMC report only all year
EFFAFlow, in conduit or thru treatment plantDAILY AV report only all year
EFFAChlorine, total residualDAILY MX <= .1 mg/L all year
EFFADi[2-ethylhexyl] adipateDAILY MX report only all year
EFFAEndothallDAILY MX report only all year
EFFAPerchlorate [ClO4]DAILY MX report only all year
EFFA4-Chloro-3-methylphenolDAILY MX report only all year
EFFASolids, total dissolvedANNL AVG <= 650 mg/L all year
EFFASolids, total dissolvedANNL AVG <= 988 mg/L all year
EFFAPhosphate, total, color method [as P]DAILY MX report only all year
EFFAMercury, total recoverableMO AVG <= .012 ug/L all year
EFFAMercury, total recoverableDAILY MX report only all year
EFFAMercury, total recoverableDAILY MX <= .024 ug/L all year
EFFAColiform, total generalINST MAX <= 240 MPN/100mL all year
EFFAColiform, total general7C <= 2.2 MPN/100mL all year
EFFAColiform, total general3E <= 23 MPN/100mL all year
EFFAcis-1,2-DichloroethyleneDAILY MX report only all year
EFFA1,3-DichloropropeneDAILY MX report only all year
EFFA1,2,3-TrichloropropaneDAILY MX report only all year
EFFAEthylene dibromideDAILY MX report only all year
EFFA1,1,2-Trichloro-1,2,2-trifluoroethaneDAILY MX report only all year
EFFA2,4,5-TPDAILY MX report only all year
EFFAGlyphosate, totalDAILY MX report only all year
EFFABOD, 5-day, percent removalMO AV MN >= 85 % all year
EFFASolids, suspended percent removalMO AV MN >= 85 % all year
EFFASulfateANNL AVG <= 100 mg/L all year
EFFASulfateANNL AVG <= 157 mg/L all year
EFFAChlorine usageMO AVG report only all year
EFFAChlorine usageDAILY MX report only all year
EFFACarbofuranDAILY MX report only all year
EFFAXylene [mix of m+o+p]DAILY MX report only all year
EFFAStyreneDAILY MX report only all year
EFFADibromochloropropaneDAILY MX report only all year
EFFAChloroethaneDAILY MX report only all year
EFFAAcute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFFAAcute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr P promelasMO MED <= 0 pass=0;fail=1 all year
EFFAAcute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr P promelasDAILY MX <= 50 % effect all year
EFFAChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFFAChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFFAChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
EFFBChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFFBChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFFBChronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
INF1BOD, 5-day, 20 deg. CDAILY MX report only all year
INF1Solids, total suspendedDAILY MX report only all year
INF1Flow, in conduit or thru treatment plantMO AVG report only all year
INF1Flow, in conduit or thru treatment plantDAILY MX report only all year

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