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Sewerage Systems, San Lorenzo, California. NPDES permit CA0037559, in force until May 31, 2029. No reports in EPA's file for the last 12 months. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Nitrogen, ammonia, percent removal | minimum annual average | ≥ 75 % | all year | EF2C |
| pH | instantaneous minimum | report only (SU) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | EF2C |
| pH | instantaneous maximum | report only (SU) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | EF2C |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Solids, total suspended | weekly average | ≤ 30 mg/L | May–Sep | EF2C |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Sep | EF2C |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | May–Sep | EF2C |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | May–Sep | EF2C |
| Cyanide, total [as CN] | monthly average | ≤ 6.3 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Cyanide, total [as CN] | daily maximum | ≤ 12 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | EF2C |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | EF2C |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | EF2C |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Copper, total recoverable | monthly average | ≤ 13 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| 2-Methyl-4,6-dinitrophenol | daily maximum | report only (ug/L) | all year | EF2C |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year | EF2C |
| Carbon tetrachloride | daily maximum | report only (ug/L) | all year | EF2C |
| 1,2-Dichloroethane | daily maximum | report only (ug/L) | all year | EF2C |
| Bromoform | daily maximum | report only (ug/L) | all year | EF2C |
| Dibromochloromethane | daily maximum | report only (ug/L) | all year | EF2C |
| Toluene | daily maximum | report only (ug/L) | all year | EF2C |
| Benzene | daily maximum | report only (ug/L) | all year | EF2C |
| Acenaphthene | daily maximum | report only (ug/L) | all year | EF2C |
| Acrolein | daily maximum | report only (ug/L) | all year | EF2C |
| Acrylonitrile | daily maximum | report only (ug/L) | all year | EF2C |
| Anthracene | daily maximum | report only (ug/L) | all year | EF2C |
| Benzo[b]fluoranthene | daily maximum | report only (ug/L) | all year | EF2C |
| Benzo[k]fluoranthene | daily maximum | report only (ug/L) | all year | EF2C |
| Benzo[a]pyrene | daily maximum | report only (ug/L) | all year | EF2C |
| Bis[2-chloroethyl] ether | daily maximum | report only (ug/L) | all year | EF2C |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (ug/L) | all year | EF2C |
| Butyl benzyl phthalate | daily maximum | report only (ug/L) | all year | EF2C |
| Chlorobenzene | daily maximum | report only (ug/L) | all year | EF2C |
| Chrysene | daily maximum | report only (ug/L) | all year | EF2C |
| Diethyl phthalate | daily maximum | report only (ug/L) | all year | EF2C |
| Dimethyl phthalate | daily maximum | report only (ug/L) | all year | EF2C |
| 1,2-Diphenylhydrazine | daily maximum | report only (ug/L) | all year | EF2C |
| Endosulfan sulfate | daily maximum | report only (ug/L) | all year | EF2C |
| .beta.-Endosulfan | daily maximum | report only (ug/L) | all year | EF2C |
| .alpha.-Endosulfan | daily maximum | report only (ug/L) | all year | EF2C |
| Endrin aldehyde | daily maximum | report only (ug/L) | all year | EF2C |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | EF2C |
| Fluoranthene | daily maximum | report only (ug/L) | all year | EF2C |
| Fluorene | daily maximum | report only (ug/L) | all year | EF2C |
| Hexachlorocyclopentadiene | daily maximum | report only (ug/L) | all year | EF2C |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year | EF2C |
| Hexachloroethane | daily maximum | report only (ug/L) | all year | EF2C |
| Indeno[1,2,3-cd]pyrene | daily maximum | report only (ug/L) | all year | EF2C |
| Isophorone | daily maximum | report only (ug/L) | all year | EF2C |
| Methyl bromide [Bromomethane] | daily maximum | report only (ug/L) | all year | EF2C |
| Methylene chloride | daily maximum | report only (ug/L) | all year | EF2C |
| N-Nitrosodi-N-propylamine | daily maximum | report only (ug/L) | all year | EF2C |
| N-Nitrosodiphenylamine | daily maximum | report only (ug/L) | all year | EF2C |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | EF2C |
| Nitrobenzene | daily maximum | report only (ug/L) | all year | EF2C |
| Pyrene | daily maximum | report only (ug/L) | all year | EF2C |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | EF2C |
| 1,1-Dichloroethylene | daily maximum | report only (ug/L) | all year | EF2C |
| 1,1,2-Trichloroethane | daily maximum | report only (ug/L) | all year | EF2C |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (ug/L) | all year | EF2C |
| Benzo[a]anthracene | daily maximum | report only (ug/L) | all year | EF2C |
| 1,2-Dichlorobenzene | daily maximum | report only (ug/L) | all year | EF2C |
| 1,2-Dichloropropane | daily maximum | report only (ug/L) | all year | EF2C |
| trans-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year | EF2C |
| Dibenz[a,h]anthracene | daily maximum | report only (ug/L) | all year | EF2C |
| 1,3-Dichlorobenzene | daily maximum | report only (ug/L) | all year | EF2C |
| 1,4-Dichlorobenzene | daily maximum | report only (ug/L) | all year | EF2C |
| 2-Chloronaphthalene | daily maximum | report only (ug/L) | all year | EF2C |
| 2-Chlorophenol | daily maximum | report only (ug/L) | all year | EF2C |
| 2,4-Dichlorophenol | daily maximum | report only (ug/L) | all year | EF2C |
| 2,4-Dimethylphenol | daily maximum | report only (ug/L) | all year | EF2C |
| 2,4-Dinitrotoluene | daily maximum | report only (ug/L) | all year | EF2C |
| 2,4-Dinitrophenol | daily maximum | report only (ug/L) | all year | EF2C |
| 2,4,6-Trichlorophenol | daily maximum | report only (ug/L) | all year | EF2C |
| 3,3'-Dichlorobenzidine | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1016 | daily maximum | report only (ug/L) | all year | EF2C |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | daily maximum | report only (ug/L) | all year | EF2C |
| Phenol | daily maximum | report only (ug/L) | all year | EF2C |
| Pentachlorophenol | daily maximum | report only (ug/L) | all year | EF2C |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | EF2C |
| Di-n-butyl phthalate | daily maximum | report only (ug/L) | all year | EF2C |
| Benzidine | daily maximum | report only (ug/L) | all year | EF2C |
| Vinyl chloride | daily maximum | report only (ug/L) | all year | EF2C |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | EF2C |
| 4,4'-DDT | daily maximum | report only (ug/L) | all year | EF2C |
| 4,4'-DDD | daily maximum | report only (ug/L) | all year | EF2C |
| 4,4'-DDE | daily maximum | report only (ug/L) | all year | EF2C |
| Aldrin | daily maximum | report only (ug/L) | all year | EF2C |
| .alpha.-BHC | daily maximum | report only (ug/L) | all year | EF2C |
| .beta.-BHC | daily maximum | report only (ug/L) | all year | EF2C |
| .gamma.-BHC | daily maximum | report only (ug/L) | all year | EF2C |
| Chlordane [tech mix. and metabolites] | daily maximum | report only (ug/L) | all year | EF2C |
| Dieldrin | daily maximum | report only (ug/L) | all year | EF2C |
| Endrin | daily maximum | report only (ug/L) | all year | EF2C |
| Toxaphene | daily maximum | report only (ug/L) | all year | EF2C |
| Heptachlor | daily maximum | report only (ug/L) | all year | EF2C |
| Heptachlor epoxide | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1221 | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1232 | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1242 | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1248 | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1254 | daily maximum | report only (ug/L) | all year | EF2C |
| PCB-1260 | daily maximum | report only (ug/L) | all year | EF2C |
| Hexachlorobenzene | daily maximum | report only (ug/L) | all year | EF2C |
| Enterococci | instantaneous maximum | ≤ 110 MPN/100mL | all year | EF2C |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | EF2C |
| 1,3-Dichloropropene | daily maximum | report only (ug/L) | all year | EF2C |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EF2C |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 30 mg/L | May–Sep | EF2C |
| Duration | daily maximum | report only (min) | all year | EFWW |
| Flow, in conduit or thru treatment plant | average | report only (MGD) | all year | EFWW |
| Chlorine, total residual | 1-hour average | ≤ .013 mg/L | all year | EFWW |
| Volume, total | daily maximum | report only (gal) | all year | EFWW |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May–Sep | IN2C |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Sep | IN2C |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | May–Sep | IN2C |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | May–Sep | IN2C |
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/CA0037559 · MCP: https://passage-data.com/mcp