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Rio Vista, City of

Sewage treatment plant, major discharger, Rio Vista, California. NPDES permit CA0083771, in force until May 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: outfall EFF1 form A monthly (18 values), outfall INF1 form A monthly (8 values), outfall EFF1 form Q quarterly, outfall EFF1 form S twice a year, outfall EFF1 form Y yearly, outfall INF1 form Q quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 4 required values missing, 2 of 34 reports late

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all yearEFF1
Specific conductancedaily maximumreport only (umho/cm)all yearEFF1
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all yearEFF1
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall yearEFF1
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall yearEFF1
pHinstantaneous minimum≥ 6.5 SUall yearEFF1
pHinstantaneous maximum≤ 8.5 SUall yearEFF1
Solids, total suspendedmonthly average≤ 10 mg/Lall yearEFF1
Solids, total suspendedweekly average≤ 15 mg/Lall yearEFF1
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/Lall yearEFF1
Nitrogen, ammonia total [as N]weekly average≤ 2.4 mg/Lall yearEFF1
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearEFF1
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all yearEFF1
Zinc, total recoverablemonthly average≤ 204 ug/Lall yearEFF1
Zinc, total recoverabledaily maximum≤ 409 ug/Lall yearEFF1
Copper, total recoverablemonthly average≤ 19 ug/Lall yearEFF1
Copper, total recoverabledaily maximum≤ 25 ug/Lall yearEFF1
Chlorpyrifosmonthly averagereport only (ug/L)all yearEFF1
Chlorpyrifosweekly averagereport only (ug/L)all yearEFF1
Diazinonmonthly averagereport only (ug/L)all yearEFF1
Diazinonweekly averagereport only (ug/L)all yearEFF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearEFF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearEFF1
Diazinon + Chlorpyrifosmonthly average≤ 1 ug/Lall yearEFF1
Diazinon + Chlorpyrifosweekly average≤ 1 ug/Lall yearEFF1
Solids, total dissolveddaily maximumreport only (mg/L)all yearEFF1
Mercury, total recoverabledaily maximumreport only (ng/L)all yearEFF1
Mercury, total recoverableannual total≤ .52 g/yrall yearEFF1
Coliform, total generalinstantaneous maximum≤ 240 MPN/100mLall yearEFF1
Coliform, total general7-day median≤ 2.2 MPN/100mLall yearEFF1
Coliform, total general30-day maximum≤ 23 MPN/100mLall yearEFF1
Methylmercurydaily maximumreport only (ng/L)all yearEFF1
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all yearEFF1
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearEFF1
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly median≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximum≤ 50 % effectall yearEFF1
Specific conductancedaily maximumreport only (umho/cm)all yearINF1
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF1
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF1
pHinstantaneous minimumreport only (SU)all yearINF1
pHinstantaneous maximumreport only (SU)all yearINF1
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1

How strict are these limits?

Cited limits by parameter: California's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CA0083771 · MCP: https://passage-data.com/mcp