Rio Vista, City of

NPDES permit CA0079588 · Minor POTW · effective, expires 2029-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

1values over a limit
16required values missing, on 1 form(s)
0of 31 forms filed late

Last period with anything received: 2026-07-31. Most often over: Flow, in conduit or thru treatment plant (1).

Reporting

Reports are due about 31 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (57)

OutfallParameterStatisticLimitMonths
EFF1Temp. diff. between samp. & upstrm deg. FINST MAX <= 20 deg F all year
EFF1Specific conductanceDAILY MX report only all year
EFF1BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
EFF1BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
EFF1pHINST MIN >= 6.5 SU all year
EFF1pHINST MAX <= 8.5 SU all year
EFF1Solids, total suspendedMO AVG <= 30 mg/L all year
EFF1Solids, total suspendedWKLY AVG <= 45 mg/L all year
EFF1Solids, settleableDAILY MX report only all year
EFF1Nitrogen, ammonia total [as N]MO AVG <= 11 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]MO AVG <= 11 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 24 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 24 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1Nitrogen, ammonia total [as N]MO AVG <= 210 lb/d Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]MO AVG <= 60 lb/d May, Jun, Jul, Aug, Sep, Oct
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 460 lb/d Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 130 lb/d May, Jun, Jul, Aug, Sep, Oct
EFF1Hardness, total [as CaCO3]DAILY MX report only all year
EFF1Arsenic, total recoverableMO AVG <= 29 ug/L all year
EFF1Arsenic, total recoverableDAILY MX <= 45 ug/L all year
EFF1Lead, total [as Pb]MO AVG <= 9 ug/L all year
EFF1Lead, total [as Pb]DAILY MX <= 18 ug/L all year
EFF1Copper, total recoverableMO AVG <= 21 ug/L all year
EFF1Copper, total recoverableDAILY MX <= 44 ug/L all year
EFF1DichlorobromomethaneMO AVG <= 65 ug/L all year
EFF1DichlorobromomethaneDAILY MX <= 110 ug/L all year
EFF1ChlorodibromomethaneMO AVG <= 53 ug/L all year
EFF1ChlorodibromomethaneDAILY MX <= 95 ug/L all year
EFF1ChlorpyrifosDAILY MX report only all year
EFF1DiazinonDAILY MX report only all year
EFF1Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
EFF1Flow, in conduit or thru treatment plantMO AVG report only May, Jun, Jul, Aug, Sep, Oct
EFF1Flow, in conduit or thru treatment plantDAILY MX <= 2.3 MGD Jan, Feb, Mar, Apr, Nov, Dec
EFF1Flow, in conduit or thru treatment plantDAILY MX <= .65 MGD May, Jun, Jul, Aug, Sep, Oct
EFF1Chlorine, total residual4A <= .011 mg/L all year
EFF1Chlorine, total residual1I <= .019 mg/L all year
EFF1Diazinon + ChlorpyrifosMO AVG <= 1 ug/L all year
EFF1Diazinon + ChlorpyrifosWKLY AVG <= 1 ug/L all year
EFF1Mercury, total [as Hg]AL <= 4.2 g/yr all year
EFF1Mercury, total recoverableDAILY MX report only all year
EFF1Coliform, total general7C <= 23 MPN/100mL all year
EFF1Coliform, total general3E <= 240 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 Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaDAILY MX <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd Sublethal Endpt, %Effect, 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