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Sewage treatment plant, Mendocino, California. NPDES permit CA0022870, in force until Sep 30, 2027. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| December 2025 | TCDD equivalents, monthly average | 12.1 ng/L | ≤ .000394 ng/L |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Turbidity | monthly average | ≤ 75 NTU | all year | 001 |
| Turbidity | weekly average | ≤ 100 NTU | all year | 001 |
| Turbidity | instantaneous maximum | ≤ 225 NTU | all year | 001 |
| Radioactivity | daily maximum | report only (pCi/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, settleable | monthly average | ≤ 1 mL/L | all year | 001 |
| Solids, settleable | weekly average | ≤ 1.5 mL/L | all year | 001 |
| Solids, settleable | instantaneous maximum | ≤ 3 mL/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, trivalent [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Oil and grease | monthly average | ≤ 25 mg/L | all year | 001 |
| Oil and grease | weekly average | ≤ 40 mg/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 75 mg/L | all year | 001 |
| 2-Methyl-4,6-dinitrophenol | daily maximum | report only (ug/L) | all year | 001 |
| 1,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| Tributyltin | daily maximum | report only (ug/L) | all year | 001 |
| Polynuclear Aromatic Hydrocarbons [PAHs] | daily maximum | report only (ug/L) | all year | 001 |
| 1,2,3,7,8-Pentachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,7,8-Pentachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 2,3,4,7,8-Pentachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,4,7,8-Hexachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,6,7,8-Hexachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,7,8,9-Hexachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 2,3,4,6,7,8-Hexachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,4,6,7,8-Heptachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,4,7,8,9-Heptachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| 1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year | 001 |
| Carbon tetrachloride | daily maximum | report only (ug/L) | all year | 001 |
| 1,2-Dichloroethane | daily maximum | report only (ug/L) | all year | 001 |
| Dibromochloromethane | daily maximum | report only (ug/L) | all year | 001 |
| Chloroform | daily maximum | report only (ug/L) | all year | 001 |
| Toluene | daily maximum | report only (ug/L) | all year | 001 |
| Benzene | daily maximum | report only (ug/L) | all year | 001 |
| Acrolein | daily maximum | report only (ug/L) | all year | 001 |
| Acrylonitrile | daily maximum | report only (ug/L) | all year | 001 |
| Bis[2-chloroethyl] ether | daily maximum | report only (ug/L) | all year | 001 |
| Bis[2-chloroethoxy]methane | daily maximum | report only (ug/L) | all year | 001 |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (ug/L) | all year | 001 |
| Chlorobenzene | daily maximum | report only (ug/L) | all year | 001 |
| Diethyl phthalate | daily maximum | report only (ug/L) | all year | 001 |
| Dimethyl phthalate | daily maximum | report only (ug/L) | all year | 001 |
| 1,2-Diphenylhydrazine | daily maximum | report only (ug/L) | all year | 001 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 001 |
| Fluoranthene | daily maximum | report only (ug/L) | all year | 001 |
| Hexachlorocyclopentadiene | daily maximum | report only (ug/L) | all year | 001 |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year | 001 |
| Hexachloroethane | daily maximum | report only (ug/L) | all year | 001 |
| Isophorone | daily maximum | report only (ug/L) | all year | 001 |
| Methylene chloride | daily maximum | report only (ug/L) | all year | 001 |
| N-Nitrosodi-N-propylamine | daily maximum | report only (ug/L) | all year | 001 |
| N-Nitrosodiphenylamine | daily maximum | report only (ug/L) | all year | 001 |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | 001 |
| Nitrobenzene | daily maximum | report only (ug/L) | all year | 001 |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | 001 |
| 1,1-Dichloroethylene | daily maximum | report only (ug/L) | all year | 001 |
| 1,1,1-Trichloroethane | daily maximum | report only (ug/L) | all year | 001 |
| 1,1,2-Trichloroethane | daily maximum | report only (ug/L) | all year | 001 |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (ug/L) | all year | 001 |
| 1,4-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 001 |
| 2,4-Dinitrotoluene | daily maximum | report only (ug/L) | all year | 001 |
| 2,4-Dinitrophenol | daily maximum | report only (ug/L) | all year | 001 |
| 2,4,6-Trichlorophenol | daily maximum | report only (ug/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | daily maximum | report only (ug/L) | all year | 001 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | daily maximum | report only (ng/L) | all year | 001 |
| 2,3,7,8-Tetrachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | 001 |
| Di-n-butyl phthalate | daily maximum | report only (ug/L) | all year | 001 |
| Benzidine | daily maximum | report only (ug/L) | all year | 001 |
| Vinyl chloride | daily maximum | report only (ug/L) | all year | 001 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 001 |
| Aldrin | daily maximum | report only (ug/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | daily maximum | report only (ug/L) | all year | 001 |
| DDT/DDD/DDE, sum of p,p' & o,p' isomers | daily maximum | report only (ug/L) | all year | 001 |
| Dieldrin | daily maximum | report only (ug/L) | all year | 001 |
| Endosulfan, total | daily maximum | report only (ug/L) | all year | 001 |
| Endrin | daily maximum | report only (ug/L) | all year | 001 |
| Toxaphene | daily maximum | report only (ug/L) | all year | 001 |
| Heptachlor | daily maximum | report only (ug/L) | all year | 001 |
| Heptachlor epoxide | daily maximum | report only (ug/L) | all year | 001 |
| Hexachlorobenzene | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | 6-month median | ≤ .2 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .81 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ 6.06 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 001 |
| 1,2,3,4,6,7,8,9-Octachlorodibenzofuran | daily maximum | report only (ng/L) | all year | 001 |
| Polychlorinated biphenyls [PCBs], sum of Aroclors | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Phenols, chlorinated | daily maximum | report only (ug/L) | all year | 001 |
| Coliform, total general | monthly median | ≤ 70 MPN/100mL | all year | 001 |
| Coliform, total general | instantaneous maximum | ≤ 230 MPN/100mL | all year | 001 |
| 1,3-Dichloropropene | daily maximum | report only (ug/L) | all year | 001 |
| Hexachlorocyclohexane, total | daily maximum | report only (ug/L) | all year | 001 |
| Phenolic compounds, unchlorinated | daily maximum | report only (ug/L) | all year | 001 |
| Halomethanes | daily maximum | report only (ug/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Dichlorobenzene | daily maximum | report only (ug/L) | all year | 001 |
| TCDD equivalents | monthly average | ≤ .000394 ng/L | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinis | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A affinis | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescens | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr H rufescens | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr Mytilus spp | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Larval Development Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr Mytilus spp | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratus | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min S purpuratus | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricus | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Fertilization Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static40min D excentricus | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyrifera | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Germination Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyrifera | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyrifera | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Germ Tube Length Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static48hr M pyrifera | maximum | report only (% effect) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
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/CA0022870 · MCP: https://passage-data.com/mcp