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Sewage treatment plant, major discharger, San Luis Obispo, California. NPDES permit CA0049224, in force until Aug 31, 2029. Last 12 months: over a limit 2 times (last January 2026), 4 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | pH, instantaneous maximum | 8.4 SU | ≤ 8.3 SU | — |
| January 2026 | Nitrogen, nitrate total [as N], monthly average | 12 mg/L | ≤ 10 mg/L | 20% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | EFFA |
| Turbidity | monthly average | report only (NTU) | all year | EFFA |
| Turbidity | daily maximum | report only (NTU) | all year | EFFA |
| Color | daily maximum | report only (mg/L) | all year | EFFA |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 4 mg/L | all year | EFFA |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year | EFFA |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | all year | EFFA |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 50 mg/L | all year | EFFA |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 425 lb/d | all year | EFFA |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 2252 lb/d | all year | EFFA |
| pH | instantaneous minimum | ≥ 7 SU | all year | EFFA |
| pH | instantaneous maximum | ≤ 8.3 SU | all year | EFFA |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | EFFA |
| Solids, total suspended | weekly average | ≤ 30 mg/L | all year | EFFA |
| Solids, total suspended | daily maximum | ≤ 75 mg/L | all year | EFFA |
| Solids, total suspended | monthly average | ≤ 425 lb/d | all year | EFFA |
| Solids, total suspended | daily maximum | ≤ 3378 lb/d | all year | EFFA |
| Solids, settleable | monthly average | ≤ .1 mL/L | all year | EFFA |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | EFFA |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Nitrogen, ammonia, tot unionized [as N] | monthly average | ≤ .025 mg/L | all year | EFFA |
| Nitrogen, nitrite total [as N] | monthly average | ≤ 1 mg/L | all year | EFFA |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Nitrogen, nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | EFFA |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | EFFA |
| Phosphate, ortho, dissolved [as P] | daily maximum | report only (mg/L) | all year | EFFA |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | EFFA |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFFA |
| Sodium, total recoverable | annual average | ≤ 50 mg/L | all year | EFFA |
| Sodium, total recoverable | annual average | ≤ 196 mg/L | all year | EFFA |
| Chloride [as Cl] | annual average | ≤ 100 mg/L | all year | EFFA |
| Chloride [as Cl] | annual average | ≤ 196 mg/L | all year | EFFA |
| Asbestos | daily maximum | report only (ct/L) | all year | EFFA |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | EFFA |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Cobalt, total recoverable | daily maximum | report only (mg/L) | all year | EFFA |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | EFFA |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | EFFA |
| Boron, total recoverable | daily maximum | report only (mg/L) | all year | EFFA |
| Barium, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | EFFA |
| Chromium, trivalent [as Cr] | daily maximum | report only (ug/L) | all year | EFFA |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Vanadium, total recoverable | daily maximum | report only (mg/L) | all year | EFFA |
| Molybdenum, total recoverable | monthly average | ≤ .01 mg/L | all year | EFFA |
| Molybdenum, total recoverable | monthly average | ≤ .024 mg/L | all year | EFFA |
| Lithium, total [as Li] | daily maximum | report only (mg/L) | all year | EFFA |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Oil and grease | monthly average | ≤ 5 mg/L | all year | EFFA |
| Oil and grease | daily maximum | ≤ 10 mg/L | all year | EFFA |
| 2-Methyl-4,6-dinitrophenol | daily maximum | report only (ug/L) | all year | EFFA |
| Dichloromethane | daily maximum | report only (ug/L) | all year | EFFA |
| Diquat | daily maximum | report only (ug/L) | all year | EFFA |
| Manganese, total recoverable | daily maximum | report only (mg/L) | all year | EFFA |
| Methyl tert-butyl ether [MTBE] | daily maximum | report only (ug/L) | all year | EFFA |
| Dinoseb | daily maximum | report only (ug/L) | all year | EFFA |
| Dichlorobromomethane | monthly average | ≤ .56 ug/L | all year | EFFA |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year | EFFA |
| Dichlorobromomethane | daily maximum | ≤ .96 ug/L | all year | EFFA |
| Carbon tetrachloride | daily maximum | report only (ug/L) | all year | EFFA |
| 1,2-Dichloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| Bromoform | daily maximum | report only (ug/L) | all year | EFFA |
| Dibromochloromethane | monthly average | ≤ .4 ug/L | all year | EFFA |
| Dibromochloromethane | daily maximum | report only (ug/L) | all year | EFFA |
| Dibromochloromethane | daily maximum | ≤ .81 ug/L | all year | EFFA |
| Chloroform | monthly average | ≤ 60 ug/L | all year | EFFA |
| Chloroform | daily maximum | report only (ug/L) | all year | EFFA |
| Chloroform | daily maximum | ≤ 120.6 ug/L | all year | EFFA |
| Toluene | daily maximum | report only (ug/L) | all year | EFFA |
| Benzene | daily maximum | report only (ug/L) | all year | EFFA |
| Monochlorobenzenes | daily maximum | report only (ug/L) | all year | EFFA |
| .delta.-BHC | daily maximum | report only (ug/L) | all year | EFFA |
| Acenaphthylene | daily maximum | report only (ug/L) | all year | EFFA |
| Acenaphthene | daily maximum | report only (ug/L) | all year | EFFA |
| Acrolein | daily maximum | report only (ug/L) | all year | EFFA |
| Acrylonitrile | daily maximum | report only (ug/L) | all year | EFFA |
| Anthracene | daily maximum | report only (ug/L) | all year | EFFA |
| Benzo[b]fluoranthene | daily maximum | report only (ug/L) | all year | EFFA |
| Benzo[k]fluoranthene | daily maximum | report only (ug/L) | all year | EFFA |
| Benzo[a]pyrene | daily maximum | report only (ug/L) | all year | EFFA |
| Bis[2-chloroethyl] ether | daily maximum | report only (ug/L) | all year | EFFA |
| Bis[2-chloroethoxy]methane | daily maximum | report only (ug/L) | all year | EFFA |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (ug/L) | all year | EFFA |
| Butyl benzyl phthalate | daily maximum | report only (ug/L) | all year | EFFA |
| Chlorobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| Chrysene | daily maximum | report only (ug/L) | all year | EFFA |
| Diethyl phthalate | daily maximum | report only (ug/L) | all year | EFFA |
| Dimethyl phthalate | daily maximum | report only (ug/L) | all year | EFFA |
| 1,2-Diphenylhydrazine | daily maximum | report only (ug/L) | all year | EFFA |
| Endosulfan sulfate | daily maximum | report only (ug/L) | all year | EFFA |
| .beta.-Endosulfan | daily maximum | report only (ug/L) | all year | EFFA |
| .alpha.-Endosulfan | daily maximum | report only (ug/L) | all year | EFFA |
| Endrin aldehyde | daily maximum | report only (ug/L) | all year | EFFA |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | EFFA |
| Fluoranthene | daily maximum | report only (ug/L) | all year | EFFA |
| Fluorene | daily maximum | report only (ug/L) | all year | EFFA |
| Hexachlorocyclopentadiene | daily maximum | report only (ug/L) | all year | EFFA |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year | EFFA |
| Hexachloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| Indeno[1,2,3-cd]pyrene | daily maximum | report only (ug/L) | all year | EFFA |
| Isophorone | daily maximum | report only (ug/L) | all year | EFFA |
| Methyl bromide [Bromomethane] | daily maximum | report only (ug/L) | all year | EFFA |
| Methyl chloride [Chloromethane] | daily maximum | report only (ug/L) | all year | EFFA |
| Methylene chloride | monthly average | ≤ 4.7 ug/L | all year | EFFA |
| Methylene chloride | daily maximum | report only (ug/L) | all year | EFFA |
| Methylene chloride | daily maximum | ≤ 9.45 ug/L | all year | EFFA |
| N-Nitrosodi-N-propylamine | daily maximum | report only (ug/L) | all year | EFFA |
| N-Nitrosodiphenylamine | daily maximum | report only (ug/L) | all year | EFFA |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | EFFA |
| Nitrobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| Phenanthrene | daily maximum | report only (ug/L) | all year | EFFA |
| Pyrene | daily maximum | report only (ug/L) | all year | EFFA |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | EFFA |
| Trichlorofluoromethane | daily maximum | report only (ug/L) | all year | EFFA |
| 1,1-Dichloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| 1,1-Dichloroethylene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,1,1-Trichloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| 1,1,2-Trichloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| Benzo[ghi]perylene | daily maximum | report only (ug/L) | all year | EFFA |
| Benzo[a]anthracene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,2-Dichlorobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,2-Dichloropropane | daily maximum | report only (ug/L) | all year | EFFA |
| trans-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,2,4-Trichlorobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| Dibenz[a,h]anthracene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,3-Dichlorobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,4-Dichlorobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| 2-Chloroethyl vinyl ether, [mixed] | daily maximum | report only (ug/L) | all year | EFFA |
| 2-Chloronaphthalene | daily maximum | report only (ug/L) | all year | EFFA |
| 2-Chlorophenol | daily maximum | report only (ug/L) | all year | EFFA |
| 2-Nitrophenol | daily maximum | report only (ug/L) | all year | EFFA |
| Di-n-octyl phthalate | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4-Dichlorophenol | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4-Dimethylphenol | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4-Dinitrotoluene | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4-Dinitrophenol | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4,6-Trichlorophenol | daily maximum | report only (ug/L) | all year | EFFA |
| 2,6-Dinitrotoluene | daily maximum | report only (ug/L) | all year | EFFA |
| 3,3'-Dichlorobenzidine | daily maximum | report only (ug/L) | all year | EFFA |
| 4-Bromophenyl phenyl ether | daily maximum | report only (ug/L) | all year | EFFA |
| 4-Chlorophenyl phenyl ether | daily maximum | report only (ug/L) | all year | EFFA |
| 4-Nitrophenol | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1016 | daily maximum | report only (ug/L) | all year | EFFA |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | daily maximum | report only (ug/L) | all year | EFFA |
| Phenol | daily maximum | report only (ug/L) | all year | EFFA |
| Naphthalene | daily maximum | report only (ug/L) | all year | EFFA |
| Bolero | daily maximum | report only (ug/L) | all year | EFFA |
| Surfactants [MBAS] | monthly average | ≤ .2 mg/L | all year | EFFA |
| Dalapon | daily maximum | report only (ug/L) | all year | EFFA |
| Bentazon, total | daily maximum | report only (ug/L) | all year | EFFA |
| Oxamyl | daily maximum | report only (ug/L) | all year | EFFA |
| Pentachlorophenol | monthly average | ≤ .28 ug/L | all year | EFFA |
| Pentachlorophenol | daily maximum | report only (ug/L) | all year | EFFA |
| Pentachlorophenol | daily maximum | ≤ .56 ug/L | all year | EFFA |
| Atrazine | daily maximum | report only (ug/L) | all year | EFFA |
| Simazine | daily maximum | report only (ug/L) | all year | EFFA |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | EFFA |
| Di-n-butyl phthalate | daily maximum | report only (ug/L) | all year | EFFA |
| Benzidine | daily maximum | report only (ug/L) | all year | EFFA |
| Alachlor | daily maximum | report only (ug/L) | all year | EFFA |
| Vinyl chloride | daily maximum | report only (ug/L) | all year | EFFA |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | EFFA |
| 4,4'-DDT | daily maximum | report only (ug/L) | all year | EFFA |
| 4,4'-DDD | daily maximum | report only (ug/L) | all year | EFFA |
| 4,4'-DDE | daily maximum | report only (ug/L) | all year | EFFA |
| Aldrin | daily maximum | report only (ug/L) | all year | EFFA |
| .alpha.-BHC | daily maximum | report only (ug/L) | all year | EFFA |
| .beta.-BHC | daily maximum | report only (ug/L) | all year | EFFA |
| .gamma.-BHC | daily maximum | report only (ug/L) | all year | EFFA |
| Chlordane [tech mix. and metabolites] | daily maximum | report only (ug/L) | all year | EFFA |
| Dieldrin | daily maximum | report only (ug/L) | all year | EFFA |
| Endrin | daily maximum | report only (ug/L) | all year | EFFA |
| Toxaphene | daily maximum | report only (ug/L) | all year | EFFA |
| Heptachlor | daily maximum | report only (ug/L) | all year | EFFA |
| Heptachlor epoxide | daily maximum | report only (ug/L) | all year | EFFA |
| Methoxychlor | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1221 | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1232 | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1242 | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1248 | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1254 | daily maximum | report only (ug/L) | all year | EFFA |
| PCB-1260 | daily maximum | report only (ug/L) | all year | EFFA |
| Hexachlorobenzene | daily maximum | report only (ug/L) | all year | EFFA |
| Picloram | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4-Dichlorophenoxyacetic acid | daily maximum | report only (ug/L) | all year | EFFA |
| Molinate | daily maximum | report only (ug/L) | all year | EFFA |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | EFFA |
| Flow, in conduit or thru treatment plant | instantaneous maximum | report only (MGD) | all year | EFFA |
| Flow, in conduit or thru treatment plant | mean | report only (MGD) | all year | EFFA |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | EFFA |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | EFFA |
| Di[2-ethylhexyl] adipate | daily maximum | report only (ug/L) | all year | EFFA |
| Endothall | daily maximum | report only (ug/L) | all year | EFFA |
| Perchlorate [ClO4] | daily maximum | report only (ug/L) | all year | EFFA |
| 4-Chloro-3-methylphenol | daily maximum | report only (ug/L) | all year | EFFA |
| Solids, total dissolved | annual average | ≤ 650 mg/L | all year | EFFA |
| Solids, total dissolved | annual average | ≤ 988 mg/L | all year | EFFA |
| Phosphate, total, color method [as P] | daily maximum | report only (mg/L) | all year | EFFA |
| Mercury, total recoverable | monthly average | ≤ .012 ug/L | all year | EFFA |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | EFFA |
| Mercury, total recoverable | daily maximum | ≤ .024 ug/L | all year | EFFA |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | all year | EFFA |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | all year | EFFA |
| Coliform, total general | 30-day maximum | ≤ 23 MPN/100mL | all year | EFFA |
| cis-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,3-Dichloropropene | daily maximum | report only (ug/L) | all year | EFFA |
| 1,2,3-Trichloropropane | daily maximum | report only (ug/L) | all year | EFFA |
| Ethylene dibromide | daily maximum | report only (ug/L) | all year | EFFA |
| 1,1,2-Trichloro-1,2,2-trifluoroethane | daily maximum | report only (ug/L) | all year | EFFA |
| 2,4,5-TP | daily maximum | report only (ug/L) | all year | EFFA |
| Glyphosate, total | daily maximum | report only (ug/L) | all year | EFFA |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | EFFA |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | EFFA |
| Sulfate | annual average | ≤ 100 mg/L | all year | EFFA |
| Sulfate | annual average | ≤ 157 mg/L | all year | EFFA |
| Chlorine usage | monthly average | report only (lb/d) | all year | EFFA |
| Chlorine usage | daily maximum | report only (lb/d) | all year | EFFA |
| Carbofuran | daily maximum | report only (ug/L) | all year | EFFA |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | EFFA |
| Styrene | daily maximum | report only (ug/L) | all year | EFFA |
| Dibromochloropropane | daily maximum | report only (ug/L) | all year | EFFA |
| Chloroethane | daily maximum | report only (ug/L) | all year | EFFA |
| Acute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFFA |
| Acute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | EFFA |
| Acute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr P promelas | daily maximum | ≤ 50 % effect | all year | EFFA |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFFA |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | EFFA |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | EFFA |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFFB |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | monthly median | ≤ 0 pass=0;fail=1 | all year | EFFB |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | daily maximum | ≤ 50 % effect | all year | EFFB |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF1 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF1 |
Cited limits by parameter: California's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/CA0049224 · MCP: https://passage-data.com/mcp