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Imperial, City of

Sewage treatment plant, major discharger, Imperial, California. NPDES permit CA0104400 expired Sep 30, 2020; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: outfall 001 form A monthly (26 values), outfall 001 form Q quarterly (8 values), outfall INF form A monthly (8 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 29 reports late

Limits in force (304)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year001
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 601 lb/dall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 901 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedhighest weekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 601 lb/dall year001
Solids, total suspendedhighest weekly average≤ 901 lb/dall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Arsenic, total recoverabledaily maximumreport only (ug/L)all year001
Arsenic, total recoverabledaily maximumreport only (ug/L)all year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Thallium, total recoverabledaily maximumreport only (ug/L)all year001
Thallium, total recoverabledaily maximumreport only (ug/L)all year001
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year001
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year001
Chromium, trivalent [as Cr]daily maximumreport only (ug/L)all year001
Chromium, trivalent [as Cr]daily maximumreport only (ug/L)all year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Silver total recoverabledaily maximumreport only (ug/L)all year001
Silver total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverablemonthly average≤ 9.8 ug/Lall year001
Copper, total recoverabledaily maximum≤ 30.4 ug/Lall year001
Copper, total recoverablemonthly average≤ .19 lb/dall year001
Copper, total recoverabledaily maximum≤ .61 lb/dall year001
Antimony, total recoverabledaily maximumreport only (ug/L)all year001
Antimony, total recoverabledaily maximumreport only (ug/L)all year001
Oil and greasedaily maximum≤ 25 mg/Lall year001
Oil and greasedaily maximum≤ 500 lb/dall year001
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all year001
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all year001
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year001
Coliform, fecal - % samples exceeding limittotal≤ 10 %all year001
Dichlorobromomethanedaily maximumreport only (ug/L)all year001
Dichlorobromomethanedaily maximumreport only (ug/L)all year001
Carbon tetrachloridedaily maximumreport only (ug/L)all year001
Carbon tetrachloridedaily maximumreport only (ug/L)all year001
1,2-Dichloroethanedaily maximumreport only (ug/L)all year001
1,2-Dichloroethanedaily maximumreport only (ug/L)all year001
Bromoformdaily maximumreport only (ug/L)all year001
Bromoformdaily maximumreport only (ug/L)all year001
Dibromochloromethanedaily maximumreport only (ug/L)all year001
Dibromochloromethanedaily maximumreport only (ug/L)all year001
Chloroformdaily maximumreport only (ug/L)all year001
Chloroformdaily maximumreport only (ug/L)all year001
Toluenedaily maximumreport only (ug/L)all year001
Toluenedaily maximumreport only (ug/L)all year001
Benzenedaily maximumreport only (ug/L)all year001
Benzenedaily maximumreport only (ug/L)all year001
.delta.-BHCdaily maximumreport only (ug/L)all year001
.delta.-BHCdaily maximumreport only (ug/L)all year001
Acenaphthylenedaily maximumreport only (ug/L)all year001
Acenaphthylenedaily maximumreport only (ug/L)all year001
Acenaphthenedaily maximumreport only (ug/L)all year001
Acenaphthenedaily maximumreport only (ug/L)all year001
Acroleindaily maximumreport only (ug/L)all year001
Acroleindaily maximumreport only (ug/L)all year001
Acrylonitriledaily maximumreport only (ug/L)all year001
Acrylonitriledaily maximumreport only (ug/L)all year001
Anthracenedaily maximumreport only (ug/L)all year001
Anthracenedaily maximumreport only (ug/L)all year001
Benzo[b]fluoranthenedaily maximumreport only (ug/L)all year001
Benzo[b]fluoranthenedaily maximumreport only (ug/L)all year001
Benzo[k]fluoranthenedaily maximumreport only (ug/L)all year001
Benzo[k]fluoranthenedaily maximumreport only (ug/L)all year001
Benzo[a]pyrenedaily maximumreport only (ug/L)all year001
Benzo[a]pyrenedaily maximumreport only (ug/L)all year001
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all year001
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all year001
Bis[2-chloroethoxy]methanedaily maximumreport only (ug/L)all year001
Bis[2-chloroethoxy]methanedaily maximumreport only (ug/L)all year001
Bis[2-chloroisopropyl] etherdaily maximumreport only (ug/L)all year001
Bis[2-chloroisopropyl] etherdaily maximumreport only (ug/L)all year001
Butyl benzyl phthalatedaily maximumreport only (ug/L)all year001
Butyl benzyl phthalatedaily maximumreport only (ug/L)all year001
Chlorobenzenedaily maximumreport only (ug/L)all year001
Chlorobenzenedaily maximumreport only (ug/L)all year001
Chrysenedaily maximumreport only (ug/L)all year001
Chrysenedaily maximumreport only (ug/L)all year001
Diethyl phthalatedaily maximumreport only (ug/L)all year001
Diethyl phthalatedaily maximumreport only (ug/L)all year001
Dimethyl phthalatedaily maximumreport only (ug/L)all year001
Dimethyl phthalatedaily maximumreport only (ug/L)all year001
1,2-Diphenylhydrazinedaily maximumreport only (ug/L)all year001
1,2-Diphenylhydrazinedaily maximumreport only (ug/L)all year001
Endosulfan sulfatedaily maximumreport only (ug/L)all year001
Endosulfan sulfatedaily maximumreport only (ug/L)all year001
.beta.-Endosulfandaily maximumreport only (ug/L)all year001
.beta.-Endosulfandaily maximumreport only (ug/L)all year001
.alpha.-Endosulfandaily maximumreport only (ug/L)all year001
.alpha.-Endosulfandaily maximumreport only (ug/L)all year001
Endrin aldehydedaily maximumreport only (ug/L)all year001
Endrin aldehydedaily maximumreport only (ug/L)all year001
Ethylbenzenedaily maximumreport only (ug/L)all year001
Ethylbenzenedaily maximumreport only (ug/L)all year001
Fluoranthenedaily maximumreport only (ug/L)all year001
Fluoranthenedaily maximumreport only (ug/L)all year001
Fluorenedaily maximumreport only (ug/L)all year001
Fluorenedaily maximumreport only (ug/L)all year001
Hexachlorocyclopentadienedaily maximumreport only (ug/L)all year001
Hexachlorocyclopentadienedaily maximumreport only (ug/L)all year001
Hexachlorobutadienedaily maximumreport only (ug/L)all year001
Hexachlorobutadienedaily maximumreport only (ug/L)all year001
Hexachloroethanedaily maximumreport only (ug/L)all year001
Hexachloroethanedaily maximumreport only (ug/L)all year001
Indeno[1,2,3-cd]pyrenedaily maximumreport only (ug/L)all year001
Indeno[1,2,3-cd]pyrenedaily maximumreport only (ug/L)all year001
Isophoronedaily maximumreport only (ug/L)all year001
Isophoronedaily maximumreport only (ug/L)all year001
Methyl bromide [Bromomethane]daily maximumreport only (ug/L)all year001
Methyl bromide [Bromomethane]daily maximumreport only (ug/L)all year001
Methyl chloride [Chloromethane]daily maximumreport only (ug/L)all year001
Methyl chloride [Chloromethane]daily maximumreport only (ug/L)all year001
Methylene chloridedaily maximumreport only (ug/L)all year001
Methylene chloridedaily maximumreport only (ug/L)all year001
N-Nitrosodi-N-propylaminedaily maximumreport only (ug/L)all year001
N-Nitrosodi-N-propylaminedaily maximumreport only (ug/L)all year001
N-Nitrosodiphenylaminedaily maximumreport only (ug/L)all year001
N-Nitrosodiphenylaminedaily maximumreport only (ug/L)all year001
N-Nitrosodimethylamine [NDMA]daily maximumreport only (ug/L)all year001
N-Nitrosodimethylamine [NDMA]daily maximumreport only (ug/L)all year001
Nitrobenzenedaily maximumreport only (ug/L)all year001
Nitrobenzenedaily maximumreport only (ug/L)all year001
Phenanthrenedaily maximumreport only (ug/L)all year001
Phenanthrenedaily maximumreport only (ug/L)all year001
Pyrenedaily maximumreport only (ug/L)all year001
Pyrenedaily maximumreport only (ug/L)all year001
Tetrachloroethylenedaily maximumreport only (ug/L)all year001
Tetrachloroethylenedaily maximumreport only (ug/L)all year001
1,1-Dichloroethanedaily maximumreport only (ug/L)all year001
1,1-Dichloroethanedaily maximumreport only (ug/L)all year001
1,1-Dichloroethylenedaily maximumreport only (ug/L)all year001
1,1-Dichloroethylenedaily maximumreport only (ug/L)all year001
1,1,1-Trichloroethanedaily maximumreport only (ug/L)all year001
1,1,1-Trichloroethanedaily maximumreport only (ug/L)all year001
1,1,2-Trichloroethanedaily maximumreport only (ug/L)all year001
1,1,2-Trichloroethanedaily maximumreport only (ug/L)all year001
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)all year001
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)all year001
Benzo[ghi]perylenedaily maximumreport only (ug/L)all year001
Benzo[ghi]perylenedaily maximumreport only (ug/L)all year001
Benzo[a]anthracenedaily maximumreport only (ug/L)all year001
Benzo[a]anthracenedaily maximumreport only (ug/L)all year001
1,2-Dichlorobenzenedaily maximumreport only (ug/L)all year001
1,2-Dichlorobenzenedaily maximumreport only (ug/L)all year001
1,2-Dichloropropanedaily maximumreport only (ug/L)all year001
1,2-Dichloropropanedaily maximumreport only (ug/L)all year001
trans-1,2-Dichloroethylenedaily maximumreport only (ug/L)all year001
trans-1,2-Dichloroethylenedaily maximumreport only (ug/L)all year001
1,2,4-Trichlorobenzenedaily maximumreport only (ug/L)all year001
1,2,4-Trichlorobenzenedaily maximumreport only (ug/L)all year001
Dibenz[a,h]anthracenedaily maximumreport only (ug/L)all year001
Dibenz[a,h]anthracenedaily maximumreport only (ug/L)all year001
1,3-Dichlorobenzenedaily maximumreport only (ug/L)all year001
1,3-Dichlorobenzenedaily maximumreport only (ug/L)all year001
1,4-Dichlorobenzenedaily maximumreport only (ug/L)all year001
1,4-Dichlorobenzenedaily maximumreport only (ug/L)all year001
2-Chloroethyl vinyl ether, [mixed]daily maximumreport only (ug/L)all year001
2-Chloroethyl vinyl ether, [mixed]daily maximumreport only (ug/L)all year001
2-Chloronaphthalenedaily maximumreport only (ug/L)all year001
2-Chloronaphthalenedaily maximumreport only (ug/L)all year001
2-Chlorophenoldaily maximumreport only (ug/L)all year001
2-Chlorophenoldaily maximumreport only (ug/L)all year001
2-Nitrophenoldaily maximumreport only (ug/L)all year001
2-Nitrophenoldaily maximumreport only (ug/L)all year001
Di-n-octyl phthalatedaily maximumreport only (ug/L)all year001
Di-n-octyl phthalatedaily maximumreport only (ug/L)all year001
2,4-Dichlorophenoldaily maximumreport only (ug/L)all year001
2,4-Dichlorophenoldaily maximumreport only (ug/L)all year001
2,4-Dimethylphenoldaily maximumreport only (ug/L)all year001
2,4-Dimethylphenoldaily maximumreport only (ug/L)all year001
2,4-Dinitrotoluenedaily maximumreport only (ug/L)all year001
2,4-Dinitrotoluenedaily maximumreport only (ug/L)all year001
2,4-Dinitrophenoldaily maximumreport only (ug/L)all year001
2,4-Dinitrophenoldaily maximumreport only (ug/L)all year001
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all year001
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all year001
2,6-Dinitrotoluenedaily maximumreport only (ug/L)all year001
2,6-Dinitrotoluenedaily maximumreport only (ug/L)all year001
3,3'-Dichlorobenzidinedaily maximumreport only (ug/L)all year001
3,3'-Dichlorobenzidinedaily maximumreport only (ug/L)all year001
4-Bromophenyl phenyl etherdaily maximumreport only (ug/L)all year001
4-Bromophenyl phenyl etherdaily maximumreport only (ug/L)all year001
4-Chlorophenyl phenyl etherdaily maximumreport only (ug/L)all year001
4-Chlorophenyl phenyl etherdaily maximumreport only (ug/L)all year001
4-Nitrophenoldaily maximumreport only (ug/L)all year001
4-Nitrophenoldaily maximumreport only (ug/L)all year001
PCB-1016daily maximumreport only (ug/L)all year001
PCB-1016daily maximumreport only (ug/L)all year001
2,3,7,8-Tetrachlorodibenzo-p-dioxindaily maximumreport only (ug/L)all year001
2,3,7,8-Tetrachlorodibenzo-p-dioxindaily maximumreport only (ug/L)all year001
Phenoldaily maximumreport only (ug/L)all year001
Phenoldaily maximumreport only (ug/L)all year001
Naphthalenedaily maximumreport only (ug/L)all year001
Naphthalenedaily maximumreport only (ug/L)all year001
Pentachlorophenoldaily maximumreport only (ug/L)all year001
Pentachlorophenoldaily maximumreport only (ug/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all year001
Di-n-butyl phthalatedaily maximumreport only (ug/L)all year001
Di-n-butyl phthalatedaily maximumreport only (ug/L)all year001
Benzidinedaily maximumreport only (ug/L)all year001
Benzidinedaily maximumreport only (ug/L)all year001
Vinyl chloridedaily maximumreport only (ug/L)all year001
Vinyl chloridedaily maximumreport only (ug/L)all year001
Trichloroethylenedaily maximumreport only (ug/L)all year001
Trichloroethylenedaily maximumreport only (ug/L)all year001
4,4'-DDTdaily maximumreport only (ug/L)all year001
4,4'-DDTdaily maximumreport only (ug/L)all year001
4,4'-DDDdaily maximumreport only (ug/L)all year001
4,4'-DDDdaily maximumreport only (ug/L)all year001
4,4'-DDEdaily maximumreport only (ug/L)all year001
4,4'-DDEdaily maximumreport only (ug/L)all year001
Aldrindaily maximumreport only (ug/L)all year001
Aldrindaily maximumreport only (ug/L)all year001
.alpha.-BHCdaily maximumreport only (ug/L)all year001
.alpha.-BHCdaily maximumreport only (ug/L)all year001
.beta.-BHCdaily maximumreport only (ug/L)all year001
.beta.-BHCdaily maximumreport only (ug/L)all year001
.gamma.-BHCdaily maximumreport only (ug/L)all year001
.gamma.-BHCdaily maximumreport only (ug/L)all year001
Chlordane [tech mix. and metabolites]daily maximumreport only (ug/L)all year001
Chlordane [tech mix. and metabolites]daily maximumreport only (ug/L)all year001
Dieldrindaily maximumreport only (ug/L)all year001
Dieldrindaily maximumreport only (ug/L)all year001
Endrindaily maximumreport only (ug/L)all year001
Endrindaily maximumreport only (ug/L)all year001
Toxaphenedaily maximumreport only (ug/L)all year001
Toxaphenedaily maximumreport only (ug/L)all year001
Heptachlordaily maximumreport only (ug/L)all year001
Heptachlordaily maximumreport only (ug/L)all year001
Heptachlor epoxidedaily maximumreport only (ug/L)all year001
Heptachlor epoxidedaily maximumreport only (ug/L)all year001
PCB-1221daily maximumreport only (ug/L)all year001
PCB-1221daily maximumreport only (ug/L)all year001
PCB-1232daily maximumreport only (ug/L)all year001
PCB-1232daily maximumreport only (ug/L)all year001
PCB-1242daily maximumreport only (ug/L)all year001
PCB-1242daily maximumreport only (ug/L)all year001
PCB-1248daily maximumreport only (ug/L)all year001
PCB-1248daily maximumreport only (ug/L)all year001
PCB-1254daily maximumreport only (ug/L)all year001
PCB-1254daily maximumreport only (ug/L)all year001
PCB-1260daily maximumreport only (ug/L)all year001
PCB-1260daily maximumreport only (ug/L)all year001
Hexachlorobenzenedaily maximumreport only (ug/L)all year001
Hexachlorobenzenedaily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. coli30-day geometric mean≤ 126 MPN/100mLall year001
E. coliinstantaneous maximum≤ 400 MPN/100mLall year001
4-Chloro-3-methylphenoldaily maximumreport only (ug/L)all year001
4-Chloro-3-methylphenoldaily maximumreport only (ug/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Phosphate, total, color method [as P]daily maximumreport only (mg/L)all year001
Mercury, total recoverabledaily maximumreport only (ug/L)all year001
Mercury, total recoverabledaily maximumreport only (ug/L)all year001
Coliform, fecal general30-day geometric mean≤ 200 MPN/100mLall year001
1,3-Dichloropropenedaily maximumreport only (ug/L)all year001
1,3-Dichloropropenedaily maximumreport only (ug/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Chloroethanedaily maximumreport only (ug/L)all year001
Chloroethanedaily maximumreport only (ug/L)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)averagereport only (tox chronic)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)averagereport only (tox chronic)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (lb/d)all yearINF
Solids, total suspendeddaily maximumreport only (lb/d)all yearINF

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CA0104400 · MCP: https://passage-data.com/mcp