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Sewage treatment plant, major discharger, San Mateo, California. NPDES permit CA0037541, in force until Nov 30, 2028. Last 12 months: over a limit once (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| August 2026 | Chlorine, total residual, 1-hour average | 1.42 mg/L | ≤ .34 mg/L | 318% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year | EFF1 |
| pH | instantaneous maximum | ≤ 9 SU | all year | EFF1 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Sep | EFF1 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EFF1 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | May–Sep | EFF1 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | EFF1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | all year | EFF1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (kg/d) | all year | EFF1 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | EFF1 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | EFF1 |
| Nitrite + Nitrate total [as N] | monthly average | report only (kg/d) | all year | EFF1 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (kg/d) | all year | EFF1 |
| Nitrogen, inorganic total | monthly average | report only (mg/L) | all year | EFF1 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | EFF1 |
| Nitrogen, inorganic total | monthly average | report only (kg/d) | all year | EFF1 |
| Nitrogen, inorganic total | daily maximum | report only (kg/d) | all year | EFF1 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | EFF1 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | EFF1 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | EFF1 |
| Phosphorus, total [as P] | daily maximum | report only (kg/d) | all year | EFF1 |
| Cyanide, total [as CN] | monthly average | ≤ 19 ug/L | all year | EFF1 |
| Cyanide, total [as CN] | daily maximum | ≤ 38 ug/L | all year | EFF1 |
| Nickel, total [as Ni] | monthly average | ≤ 30 ug/L | all year | EFF1 |
| Nickel, total [as Ni] | daily maximum | ≤ 71 ug/L | all year | EFF1 |
| Copper, total recoverable | monthly average | ≤ 51 ug/L | all year | EFF1 |
| Copper, total recoverable | daily maximum | ≤ 72 ug/L | all year | EFF1 |
| Dioxin | monthly average | ≤ .000014 ng/L | all year | EFF1 |
| Dioxin | daily maximum | ≤ .000028 ng/L | all year | EFF1 |
| Chlorine, total residual | 1-hour average | ≤ .34 mg/L | all year | EFF1 |
| Nitrogen, Ammonia Total | monthly average | ≤ 66 mg/L | all year | EFF1 |
| Nitrogen, Ammonia Total | daily maximum | ≤ 120 mg/L | all year | EFF1 |
| Polychlorinated biphenyls [PCBs], sum of congeners | monthly average | report only (ug/L) | all year | EFF1 |
| Polychlorinated biphenyls [PCBs], sum of congeners | daily maximum | report only (ug/L) | all year | EFF1 |
| Polychlorinated biphenyls [PCBs], sum of Aroclors | monthly average | report only (ug/L) | all year | EFF1 |
| Polychlorinated biphenyls [PCBs], sum of Aroclors | daily maximum | report only (ug/L) | all year | EFF1 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | EFF1 |
| Mercury, total recoverable | weekly average | report only (ug/L) | all year | EFF1 |
| Flow | daily average | report only (MGD) | all year | EFF1 |
| Flow | monthly total | report only (MGD) | all year | EFF1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | May–Sep | EFF1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EFF1 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | May–Sep | EFF1 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | EFF1 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | EFF1 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | EFF1 |
| Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | ≤ 1 pass=0;fail=1 | all year | EFF1 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahia | value | ≤ 1 pass=0;fail=1 | all year | EFF1 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahia | total | < 50 % effect | all year | EFF1 |
| Enterococci | geometric mean | ≤ 270 CFU/100mL | all year | EFFD |
| Enterococci | 90% of samples | ≤ 1100 CFU/100mL | all year | EFFD |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF1 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | INF1 |
| Flow | daily average | report only (MGD) | all year | INF1 |
| Flow | monthly total | report only (MGD) | all year | INF1 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | INF1 |
| Mercury, total recoverable | annual average | report only (kg/yr) | all year | SUM |
| Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | SUR1 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahia | value | report only (pass=0;fail=1) | all year | SUR1 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d A bahia | total | report only (% effect) | all year | SUR1 |
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/CA0037541 · MCP: https://passage-data.com/mcp