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South County Regional Wastewater Authority

Sewage treatment plant, major discharger, Gilroy, California. NPDES permit CA0049964, in force until Jun 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: outfall EFF2 form A monthly (77 values), outfall INF1 form A monthly (8 values), outfall EFF2 form Y yearly, outfall EFF2 form YY yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 25 reports late

Limits in force (251)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all yearEFF2
Turbidityinstantaneous maximum≤ 10 NTUall yearEFF2
Turbiditydaily average≤ 2 NTUall yearEFF2
Color [PT-CO units]daily maximumreport only (col unit (pc))all yearEFF2
Specific conductancedaily maximumreport only (umho/cm)all yearEFF2
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all yearEFF2
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall yearEFF2
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall yearEFF2
BOD, 5-day, 20 deg. Cdaily maximum≤ 20 mg/Lall yearEFF2
pHinstantaneous minimum≥ 7 SUall yearEFF2
pHinstantaneous maximum≤ 8.3 SUall yearEFF2
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all yearEFF2
Carbonate ion- [as CO3]daily maximumreport only (mg/L)all yearEFF2
Solids, total suspendedmonthly average≤ 10 mg/Lall yearEFF2
Solids, total suspendedweekly average≤ 15 mg/Lall yearEFF2
Solids, total suspendeddaily maximum≤ 20 mg/Lall yearEFF2
Solids, settleablemonthly averagereport only (mL/L)all yearEFF2
Solids, settleabledaily maximumreport only (mL/L)all yearEFF2
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearEFF2
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all yearEFF2
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all yearEFF2
Ammonia, unionizedmonthly average≤ .025 mg/Lall yearEFF2
Ammonia, unionizeddaily maximum≤ .05 mg/Lall yearEFF2
Nitrogen, nitrate total [as N]monthly average≤ 5 mg/Lall yearEFF2
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all yearEFF2
Nitrogen, nitrate total [as N]daily maximum≤ 10 mg/Lall yearEFF2
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearEFF2
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearEFF2
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearEFF2
Cyanide, total [as CN]monthly average≤ 5.2 ug/Lall yearEFF2
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearEFF2
Cyanide, total [as CN]daily maximum≤ 10 ug/Lall yearEFF2
Calcium, total recoverabledaily maximumreport only (mg/L)all yearEFF2
Magnesium, total recoverabledaily maximumreport only (mg/L)all yearEFF2
Sodium, total recoverablemonthly average≤ 200 mg/Lall yearEFF2
Potassium, total recoverabledaily maximumreport only (mg/L)all yearEFF2
Chloride [as Cl]monthly average≤ 250 mg/Lall yearEFF2
Sulfate, total [as SO4]monthly average≤ 250 mg/Lall yearEFF2
Asbestosdaily maximumreport only (MF/L)all yearEFF2
Fluoride, total [as F]daily maximumreport only (mg/L)all yearEFF2
Fluoride, total [as F]daily maximumreport only (mg/L)all yearEFF2
Arsenic, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Iron, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Selenium, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Thallium, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all yearEFF2
Boron, total recoverablemonthly average≤ 1 mg/Lall yearEFF2
Barium, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all yearEFF2
Chromium, trivalent [as Cr]daily maximumreport only (ug/L)all yearEFF2
Nickel, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Silver total recoverabledaily maximumreport only (ug/L)all yearEFF2
Zinc, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Zinc, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Aluminum, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Aluminum, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Cadmium, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Lead, total recoverablemonthly average≤ 2.1 ug/Lall yearEFF2
Lead, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Lead, total recoverabledaily maximum≤ 4.2 ug/Lall yearEFF2
Chromium, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Copper, total recoverablemonthly average≤ 20 ug/Lall yearEFF2
Copper, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Copper, total recoverabledaily maximum≤ 42 ug/Lall yearEFF2
Antimony, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Oil and greasedaily maximumreport only (mg/L)all yearEFF2
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all yearEFF2
Dichloromethanedaily maximumreport only (ug/L)all yearEFF2
Phosphate, ortho [as P]daily maximumreport only (mg/L)all yearEFF2
Diquatdaily maximumreport only (ug/L)all yearEFF2
Manganese, total recoverabledaily maximumreport only (mg/L)all yearEFF2
Methyl tert-butyl ether [MTBE]daily maximumreport only (ug/L)all yearEFF2
Dinosebdaily maximumreport only (ug/L)all yearEFF2
Dichlorobromomethanemonthly average≤ .45 ug/Lall yearEFF2
Dichlorobromomethanedaily maximumreport only (ug/L)all yearEFF2
Dichlorobromomethanedaily maximum≤ .9 ug/Lall yearEFF2
Carbon tetrachloridedaily maximumreport only (ug/L)all yearEFF2
1,2-Dichloroethanedaily maximumreport only (ug/L)all yearEFF2
Bromoformdaily maximumreport only (ug/L)all yearEFF2
Dibromochloromethanemonthly average≤ .4 ug/Lall yearEFF2
Dibromochloromethanedaily maximumreport only (ug/L)all yearEFF2
Dibromochloromethanedaily maximum≤ .8 ug/Lall yearEFF2
Chloroformmonthly average≤ 60 ug/Lall yearEFF2
Chloroformdaily maximumreport only (ug/L)all yearEFF2
Chloroformdaily maximum≤ 120 ug/Lall yearEFF2
Toluenedaily maximumreport only (ug/L)all yearEFF2
Benzenedaily maximumreport only (ug/L)all yearEFF2
Monochlorobenzenesdaily maximumreport only (ug/L)all yearEFF2
.delta.-BHCdaily maximumreport only (ug/L)all yearEFF2
Acenaphthylenedaily maximumreport only (ug/L)all yearEFF2
Acenaphthenedaily maximumreport only (ug/L)all yearEFF2
Acroleindaily maximumreport only (ug/L)all yearEFF2
Acrylonitriledaily maximumreport only (ug/L)all yearEFF2
Anthracenedaily maximumreport only (ug/L)all yearEFF2
Benzo[b]fluoranthenedaily maximumreport only (ug/L)all yearEFF2
Benzo[k]fluoranthenedaily maximumreport only (ug/L)all yearEFF2
Benzo[a]pyrenedaily maximumreport only (ug/L)all yearEFF2
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all yearEFF2
Bis[2-chloroethoxy]methanedaily maximumreport only (ug/L)all yearEFF2
Bis[2-chloroisopropyl] etherdaily maximumreport only (ug/L)all yearEFF2
Butyl benzyl phthalatedaily maximumreport only (ug/L)all yearEFF2
Chlorobenzenedaily maximumreport only (ug/L)all yearEFF2
Chrysenedaily maximumreport only (ug/L)all yearEFF2
Diethyl phthalatedaily maximumreport only (ug/L)all yearEFF2
Dimethyl phthalatedaily maximumreport only (ug/L)all yearEFF2
1,2-Diphenylhydrazinedaily maximumreport only (ug/L)all yearEFF2
Endosulfan sulfatedaily maximumreport only (ug/L)all yearEFF2
.beta.-Endosulfandaily maximumreport only (ug/L)all yearEFF2
.alpha.-Endosulfandaily maximumreport only (ug/L)all yearEFF2
Endrin aldehydedaily maximumreport only (ug/L)all yearEFF2
Ethylbenzenedaily maximumreport only (ug/L)all yearEFF2
Fluoranthenedaily maximumreport only (ug/L)all yearEFF2
Fluorenedaily maximumreport only (ug/L)all yearEFF2
Hexachlorocyclopentadienedaily maximumreport only (ug/L)all yearEFF2
Hexachlorobutadienedaily maximumreport only (ug/L)all yearEFF2
Hexachloroethanedaily maximumreport only (ug/L)all yearEFF2
Indeno[1,2,3-cd]pyrenedaily maximumreport only (ug/L)all yearEFF2
Isophoronedaily maximumreport only (ug/L)all yearEFF2
Methyl bromide [Bromomethane]daily maximumreport only (ug/L)all yearEFF2
Methyl chloride [Chloromethane]daily maximumreport only (ug/L)all yearEFF2
Methylene chloridedaily maximumreport only (ug/L)all yearEFF2
N-Nitrosodi-N-propylaminedaily maximumreport only (ug/L)all yearEFF2
N-Nitrosodiphenylaminedaily maximumreport only (ug/L)all yearEFF2
N-Nitrosodimethylamine [NDMA]daily maximumreport only (ug/L)all yearEFF2
Nitrobenzenedaily maximumreport only (ug/L)all yearEFF2
Phenanthrenedaily maximumreport only (ug/L)all yearEFF2
Pyrenedaily maximumreport only (ug/L)all yearEFF2
Tetrachloroethylenedaily maximumreport only (ug/L)all yearEFF2
Trichlorofluoromethanedaily maximumreport only (ug/L)all yearEFF2
1,1-Dichloroethanedaily maximumreport only (ug/L)all yearEFF2
1,1-Dichloroethylenedaily maximumreport only (ug/L)all yearEFF2
1,1,1-Trichloroethanedaily maximumreport only (ug/L)all yearEFF2
1,1,2-Trichloroethanedaily maximumreport only (ug/L)all yearEFF2
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)all yearEFF2
Benzo[ghi]perylenedaily maximumreport only (ug/L)all yearEFF2
Benzo[a]anthracenedaily maximumreport only (ug/L)all yearEFF2
1,2-Dichlorobenzenedaily maximumreport only (ug/L)all yearEFF2
1,2-Dichloropropanedaily maximumreport only (ug/L)all yearEFF2
trans-1,2-Dichloroethylenedaily maximumreport only (ug/L)all yearEFF2
1,2,4-Trichlorobenzenedaily maximumreport only (ug/L)all yearEFF2
Dibenz[a,h]anthracenedaily maximumreport only (ug/L)all yearEFF2
1,3-Dichlorobenzenedaily maximumreport only (ug/L)all yearEFF2
1,4-Dichlorobenzenedaily maximumreport only (ug/L)all yearEFF2
2-Chloroethyl vinyl ether, [mixed]daily maximumreport only (ug/L)all yearEFF2
2-Chloronaphthalenedaily maximumreport only (ug/L)all yearEFF2
2-Chlorophenoldaily maximumreport only (ug/L)all yearEFF2
2-Nitrophenoldaily maximumreport only (ug/L)all yearEFF2
Di-n-octyl phthalatedaily maximumreport only (ug/L)all yearEFF2
2,4-Dichlorophenoldaily maximumreport only (ug/L)all yearEFF2
2,4-Dimethylphenoldaily maximumreport only (ug/L)all yearEFF2
2,4-Dinitrotoluenedaily maximumreport only (ug/L)all yearEFF2
2,4-Dinitrophenoldaily maximumreport only (ug/L)all yearEFF2
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all yearEFF2
2,6-Dinitrotoluenedaily maximumreport only (ug/L)all yearEFF2
3,3'-Dichlorobenzidinedaily maximumreport only (ug/L)all yearEFF2
4-Bromophenyl phenyl etherdaily maximumreport only (ug/L)all yearEFF2
4-Chlorophenyl phenyl etherdaily maximumreport only (ug/L)all yearEFF2
4-Nitrophenoldaily maximumreport only (ug/L)all yearEFF2
PCB-1016daily maximumreport only (ug/L)all yearEFF2
2,3,7,8-Tetrachlorodibenzo-p-dioxindaily maximumreport only (mg/L)all yearEFF2
Phenoldaily maximumreport only (ug/L)all yearEFF2
Naphthalenedaily maximumreport only (ug/L)all yearEFF2
Bolerodaily maximumreport only (ug/L)all yearEFF2
Surfactants [MBAS]daily maximumreport only (ug/L)all yearEFF2
Dalapondaily maximumreport only (ug/L)all yearEFF2
Bentazon, totaldaily maximumreport only (ug/L)all yearEFF2
Oxamyldaily maximumreport only (ug/L)all yearEFF2
Chlorpyrifosdaily maximumreport only (ug/L)all yearEFF2
Pentachlorophenoldaily maximumreport only (ug/L)all yearEFF2
Atrazinedaily maximumreport only (ug/L)all yearEFF2
Simazinedaily maximumreport only (ug/L)all yearEFF2
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all yearEFF2
Di-n-butyl phthalatedaily maximumreport only (ug/L)all yearEFF2
Benzidinedaily maximumreport only (ug/L)all yearEFF2
Alachlordaily maximumreport only (ug/L)all yearEFF2
Vinyl chloridedaily maximumreport only (ug/L)all yearEFF2
Trichloroethylenedaily maximumreport only (ug/L)all yearEFF2
4,4'-DDTdaily maximumreport only (ug/L)all yearEFF2
4,4'-DDDdaily maximumreport only (ug/L)all yearEFF2
4,4'-DDEdaily maximumreport only (ug/L)all yearEFF2
Aldrindaily maximumreport only (ug/L)all yearEFF2
.alpha.-BHCdaily maximumreport only (ug/L)all yearEFF2
.beta.-BHCdaily maximumreport only (ug/L)all yearEFF2
.gamma.-BHCdaily maximumreport only (ug/L)all yearEFF2
Chlordane [tech mix. and metabolites]daily maximumreport only (ug/L)all yearEFF2
Dieldrindaily maximumreport only (ug/L)all yearEFF2
Endrindaily maximumreport only (ug/L)all yearEFF2
Toxaphenedaily maximumreport only (ug/L)all yearEFF2
Heptachlordaily maximumreport only (ug/L)all yearEFF2
Heptachlor epoxidedaily maximumreport only (ug/L)all yearEFF2
Methoxychlordaily maximumreport only (ug/L)all yearEFF2
PCB-1221daily maximumreport only (ug/L)all yearEFF2
PCB-1232daily maximumreport only (ug/L)all yearEFF2
PCB-1242daily maximumreport only (ug/L)all yearEFF2
PCB-1248daily maximumreport only (ug/L)all yearEFF2
PCB-1254daily maximumreport only (ug/L)all yearEFF2
PCB-1260daily maximumreport only (ug/L)all yearEFF2
Diazinondaily maximumreport only (ug/L)all yearEFF2
Hexachlorobenzenedaily maximumreport only (ug/L)all yearEFF2
Picloramdaily maximumreport only (ug/L)all yearEFF2
2,4-Dichlorophenoxyacetic aciddaily maximumreport only (ug/L)all yearEFF2
Molinatedaily maximumreport only (ug/L)all yearEFF2
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (MGD)all yearEFF2
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearEFF2
Flow, in conduit or thru treatment plantmeanreport only (MGD)all yearEFF2
Flow, in conduit or thru treatment planttotalreport only (MGD)all yearEFF2
Chlorine, total residualinstantaneous maximumreport only (mg/L)all yearEFF2
Di[2-ethylhexyl] adipatedaily maximumreport only (ug/L)all yearEFF2
Endothalldaily maximumreport only (ug/L)all yearEFF2
Perchlorate [ClO4]daily maximumreport only (ug/L)all yearEFF2
4-Chloro-3-methylphenoldaily maximumreport only (ug/L)all yearEFF2
Solids, total dissolvedmonthly average≤ 1000 mg/Lall yearEFF2
Mercury, total recoverabledaily maximumreport only (ug/L)all yearEFF2
Coliform, fecal generaldaily maximumreport only (MPN/100mL)all yearEFF2
Coliform, total generalinstantaneous maximum≤ 240 MPN/100mLall yearEFF2
Coliform, total general7-day median≤ 2.2 MPN/100mLall yearEFF2
Coliform, total general30-day maximum≤ 23 MPN/100mLall yearEFF2
cis-1,2-Dichloroethylenedaily maximumreport only (ug/L)all yearEFF2
1,3-Dichloropropenedaily maximumreport only (ug/L)all yearEFF2
1,2,3-Trichloropropanedaily maximumreport only (ug/L)all yearEFF2
Ethylene dibromidedaily maximumreport only (ug/L)all yearEFF2
1,1,2-Trichloro-1,2,2-trifluoroethanedaily maximumreport only (ug/L)all yearEFF2
2,4,5-TPdaily maximumreport only (ug/L)all yearEFF2
Glyphosate, totaldaily maximumreport only (ug/L)all yearEFF2
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all yearEFF2
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearEFF2
Chlorine usagedaily maximumreport only (lb/d)all yearEFF2
Carbofurandaily maximumreport only (ug/L)all yearEFF2
Xylene [mix of m+o+p]daily maximumreport only (ug/L)all yearEFF2
Styrenedaily maximumreport only (ug/L)all yearEFF2
Trihalomethane, tot.monthly average≤ 80 ug/Lall yearEFF2
Trihalomethane, tot.daily maximum≤ 160 ug/Lall yearEFF2
Dibromochloropropanedaily maximumreport only (ug/L)all yearEFF2
Chloroethanedaily maximumreport only (ug/L)all yearEFF2
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximum≤ 0 pass=0;fail=1all yearEFF2
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly median≤ 0 pass=0;fail=1all yearEFF2
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximum≤ 50 % effectall yearEFF2
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximum≤ 0 pass=0;fail=1all yearEFF2
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly median≤ 0 pass=0;fail=1all yearEFF2
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximum≤ 50 % effectall yearEFF2
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximum≤ 0 pass=0;fail=1all yearEFF2
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatamonthly median≤ 0 pass=0;fail=1all yearEFF2
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximum≤ 50 % effectall yearEFF2
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF1
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF1
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (MGD)all yearINF1
Flow, in conduit or thru treatment planttotalreport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantmeanreport only (MGD)all yearINF1

How strict are these limits?

Cited limits by parameter: California's rules and the federal ones.

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