Rio Vista, City of

NPDES permit CA0083771 · Major POTW · effective, expires 2030-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 30 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 32 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (48)

OutfallParameterStatisticLimitMonths
EFF1Temperature, water deg. fahrenheitINST MAX report only all year
EFF1Specific conductanceDAILY MX report only all year
EFF1Oxygen, dissolved [DO]INST MIN report only all year
EFF1BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFF1BOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L all year
EFF1pHINST MIN >= 6.5 SU all year
EFF1pHINST MAX <= 8.5 SU all year
EFF1Solids, total suspendedMO AVG <= 10 mg/L all year
EFF1Solids, total suspendedWKLY AVG <= 15 mg/L all year
EFF1Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L all year
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 2.4 mg/L all year
EFF1Nitrogen, nitrite total [as N]DAILY MX report only all year
EFF1Nitrogen, nitrate total [as N]DAILY MX report only all year
EFF1Nitrite + Nitrate total [as N]DAILY MX report only all year
EFF1Hardness, total [as CaCO3]DAILY MX report only all year
EFF1Zinc, total recoverableMO AVG <= 204 ug/L all year
EFF1Zinc, total recoverableDAILY MX <= 409 ug/L all year
EFF1Copper, total recoverableMO AVG <= 19 ug/L all year
EFF1Copper, total recoverableDAILY MX <= 25 ug/L all year
EFF1ChlorpyrifosMO AVG report only all year
EFF1ChlorpyrifosWKLY AVG report only all year
EFF1DiazinonMO AVG report only all year
EFF1DiazinonWKLY AVG report only all year
EFF1Flow, in conduit or thru treatment plantMO AVG report only all year
EFF1Flow, in conduit or thru treatment plantDAILY MX report only all year
EFF1Diazinon + ChlorpyrifosMO AVG <= 1 ug/L all year
EFF1Diazinon + ChlorpyrifosWKLY AVG <= 1 ug/L all year
EFF1Solids, total dissolvedDAILY MX report only all year
EFF1Mercury, total recoverableDAILY MX report only all year
EFF1Mercury, total recoverableANNL TOT <= .52 g/yr all year
EFF1Coliform, total generalINST MAX <= 240 MPN/100mL all year
EFF1Coliform, total general7C <= 2.2 MPN/100mL all year
EFF1Coliform, total general3E <= 23 MPN/100mL all year
EFF1MethylmercuryDAILY MX report only all year
EFF1BOD, 5-day, percent removalMO AV MN >= 85 % all year
EFF1Solids, suspended percent removalMO AV MN >= 85 % all year
EFF1Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaDAILY MX <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaMO MED <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaDAILY MX <= 50 % effect all year
INF1Specific conductanceDAILY MX report only all year
INF1BOD, 5-day, 20 deg. CMO AVG report only all year
INF1BOD, 5-day, 20 deg. CDAILY MX report only all year
INF1pHINST MIN report only all year
INF1pHINST MAX report only all year
INF1Solids, total suspendedMO AVG report only all year
INF1Solids, total suspendedDAILY MX report only all year
INF1Flow, in conduit or thru treatment plantMO AVG report only all year
INF1Flow, in conduit or thru treatment plantDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states