Palo Alto, City of

NPDES permit CA0037834 · Major POTW · effective, expires 2030-03-31 · 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 26 forms filed late

Last period with anything received: 2026-07-31.

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 (231)

OutfallParameterStatisticLimitMonths
EFF1Temperature, water deg. centigradeINST MAX report only all year
EFF1TurbidityINST MAX <= 10 NTU all year
EFF1BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFF1BOD, 5-day, 20 deg. CDAILY MX <= 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 suspendedDAILY MX <= 20 mg/L all year
EFF1Nitrogen, ammonia total [as N]MO AVG <= 2.7 mg/L all year
EFF1Nitrogen, ammonia total [as N]DAILY MX <= 9.5 mg/L 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 May, Jun, Jul, Aug, Sep
EFF1Nitrogen, inorganic totalMO AVG report only Jan, Feb, Mar, Apr, Oct, Nov, Dec
EFF1Nitrogen, inorganic totalDAILY MX report only May, Jun, Jul, Aug, Sep
EFF1Nitrogen, inorganic totalDAILY MX report only Jan, Feb, Mar, Apr, Oct, Nov, Dec
EFF1Nitrogen, inorganic totalMO AVG <= 2900 kg/d May, Jun, Jul, Aug, Sep
EFF1Nitrogen, inorganic totalMO AVG report only Jan, Feb, Mar, Apr, Oct, Nov, Dec
EFF1Nitrogen, inorganic totalDAILY MX report only May, Jun, Jul, Aug, Sep
EFF1Nitrogen, inorganic totalDAILY MX report only Jan, Feb, Mar, Apr, Oct, Nov, Dec
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]MO AVG <= 6.2 ug/L all year
EFF1Cyanide, total [as CN]DAILY MX <= 11 ug/L all year
EFF1AsbestosDAILY 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 recoverableMO AVG <= 25 ug/L all year
EFF1Nickel, total recoverableDAILY MX <= 31 ug/L 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 recoverableMO AVG <= 21 ug/L all year
EFF1Copper, total recoverableDAILY MX <= 30 ug/L all year
EFF1Copper, total recoverableDAILY MX report only all year
EFF1Antimony, total recoverableDAILY MX report only all year
EFF1DioxinMO AVG <= .000014 ng/L all year
EFF1DioxinDAILY MX <= .000028 ng/L all year
EFF12-Methyl-4,6-dinitrophenolDAILY 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
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
EFF12,3,7,8-TetrachlorodibenzofuranDAILY 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
EFF1Flow, totalMO TOTAL report only all year
EFF1Polychlorinated biphenyls [PCBs], sum of AroclorsMO AVG <= .00039 ug/L all year
EFF1Polychlorinated biphenyls [PCBs], sum of AroclorsDAILY MX <= .00049 ug/L all year
EFF1Octachlorodibenzo-p-dioxinDAILY MX report only all year
EFF1OctachlorodibenzofuranDAILY MX report only all year
EFF1EnterococciWK GEOMN <= 30 CFU/100mL all year
EFF1Enterococci90TH % <= 110 CFU/100mL all year
EFF14-Chloro-3-methylphenolDAILY MX report only all year
EFF1Mercury, total recoverableMO AVG <= .025 ug/L all year
EFF1Mercury, total recoverableWKLY AVG <= .027 ug/L all year
EFF1Coliform, fecal generalMO MED <= 98 MPN/100mL all year
EFF1Coliform, fecal general90TH % <= 300 MPN/100mL 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
EFF1Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
EFF1Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
EFF2Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF2Flow, totalMO TOTAL report only all year
EFF2Polychlorinated biphenyls [PCBs], sum of AroclorsMO AVG <= .00039 ug/L all year
EFF2Polychlorinated biphenyls [PCBs], sum of AroclorsDAILY MX <= .00049 ug/L all year
EFF2Mercury, total recoverableMO AVG <= .025 ug/L all year
EFF2Mercury, total recoverableWKLY AVG <= .027 ug/L all year
EFF3Flow, in conduit or thru treatment plantDAILY AV report only all year
EFF3Flow, 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
INF1Nitrogen, ammonia total [as N]DAILY MX report only all year
INF1Nitrogen, ammonia total [as N]MO AVG report only all year
INF1Nitrogen, ammonia total [as N]DAILY MX report only all year
INF1Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
INF1Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
INF1Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
INF1Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
INF1Nitrite + Nitrate total [as N]MO AVG report only all year
INF1Nitrite + Nitrate total [as N]DAILY MX report only all year
INF1Nitrite + Nitrate total [as N]MO AVG report only all year
INF1Nitrite + Nitrate total [as N]DAILY MX report only all year
INF1Phosphorus, total [as P]MO AVG report only all year
INF1Phosphorus, total [as P]DAILY MX report only all year
INF1Phosphorus, total [as P]MO AVG report only all year
INF1Phosphorus, total [as P]DAILY 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
INF1Mercury, total recoverableMO MED report only all year
INF1Mercury, total recoverable7C report only all year
SUMMercury, total recoverableANNL AVG <= .31 kg/yr all year

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