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Sewage treatment plant, Rio Vista, California. NPDES permit CA0079588, in force until Nov 30, 2029. Last 12 months: over a limit once (last October 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Flow, in conduit or thru treatment plant, daily maximum | .683 MGD | ≤ .65 MGD | 5% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temp. diff. between samp. & upstrm deg. F | instantaneous maximum | ≤ 20 deg F | all year | EFF1 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | EFF1 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | EFF1 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | EFF1 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | EFF1 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | EFF1 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | EFF1 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | EFF1 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | May–Oct | EFF1 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 24 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | EFF1 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 24 mg/L | May–Oct | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 210 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 60 lb/d | May–Oct | EFF1 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 460 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | EFF1 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 130 lb/d | May–Oct | EFF1 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFF1 |
| Arsenic, total recoverable | monthly average | ≤ 29 ug/L | all year | EFF1 |
| Arsenic, total recoverable | daily maximum | ≤ 45 ug/L | all year | EFF1 |
| Lead, total [as Pb] | monthly average | ≤ 9 ug/L | all year | EFF1 |
| Lead, total [as Pb] | daily maximum | ≤ 18 ug/L | all year | EFF1 |
| Copper, total recoverable | monthly average | ≤ 21 ug/L | all year | EFF1 |
| Copper, total recoverable | daily maximum | ≤ 44 ug/L | all year | EFF1 |
| Dichlorobromomethane | monthly average | ≤ 65 ug/L | all year | EFF1 |
| Dichlorobromomethane | daily maximum | ≤ 110 ug/L | all year | EFF1 |
| Chlorodibromomethane | monthly average | ≤ 53 ug/L | all year | EFF1 |
| Chlorodibromomethane | daily maximum | ≤ 95 ug/L | all year | EFF1 |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | EFF1 |
| Diazinon | daily maximum | report only (ug/L) | all year | EFF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec | EFF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | May–Oct | EFF1 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 2.3 MGD | Jan, Feb, Mar, Apr, Nov, Dec | EFF1 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .65 MGD | May–Oct | EFF1 |
| Chlorine, total residual | 4-day average | ≤ .011 mg/L | all year | EFF1 |
| Chlorine, total residual | 1-hour average | ≤ .019 mg/L | all year | EFF1 |
| Diazinon + Chlorpyrifos | monthly average | ≤ 1 ug/L | all year | EFF1 |
| Diazinon + Chlorpyrifos | weekly average | ≤ 1 ug/L | all year | EFF1 |
| Mercury, total [as Hg] | annual mass load | ≤ 4.2 g/yr | all year | EFF1 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | EFF1 |
| Coliform, total general | 7-day median | ≤ 23 MPN/100mL | all year | EFF1 |
| Coliform, total general | 30-day maximum | ≤ 240 MPN/100mL | all year | EFF1 |
| Methylmercury | daily maximum | report only (ng/L) | all year | EFF1 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | EFF1 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | EFF1 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 50 % effect | all year | EFF1 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | INF1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF1 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF1 |
| pH | instantaneous minimum | report only (SU) | all year | INF1 |
| pH | instantaneous maximum | report only (SU) | all year | INF1 |
| Solids, total suspended | monthly average | 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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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CA0079588 · MCP: https://passage-data.com/mcp