Vacaville, City of

NPDES permit CA0077691 · Major POTW · effective, expires 2029-07-31 · 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

9values over a limit
0required values missing, on 0 form(s)
0of 16 forms filed late

Last period with anything received: 2026-07-31. Most often over: Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia (6), Cyanide, total [as CN] (3).

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (57)

OutfallParameterStatisticLimitMonths
EFF1Temperature, water deg. fahrenheitINST MAX report only all year
EFF1TurbidityMO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
EFF1TurbidityDAILY AV report only May, Jun, Jul, Aug, Sep, Oct
EFF1TurbidityDAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
EFF1TurbidityMAXIMUM report only May, Jun, Jul, Aug, Sep, Oct
EFF1Specific conductanceDAILY MX report only all year
EFF1BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1BOD, 5-day, 20 deg. CWKLY AVG <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1BOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1pHINST MIN >= 6.5 SU all year
EFF1pHINST MAX <= 8.5 SU all year
EFF1Solids, total suspendedMO AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1Solids, total suspendedWKLY AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L all year
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 3.9 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]MO AVG <= 13 mg/L all year
EFF1Nitrite + Nitrate total [as N]WKLY AVG <= 15 mg/L all year
EFF1Carbon, dissolved organic [as C]DAILY MX report only all year
EFF1Cyanide, total [as CN]MO AVG <= 4.3 ug/L all year
EFF1Cyanide, total [as CN]DAILY MX <= 8.5 ug/L all year
EFF1Hardness, total [as CaCO3]DAILY MX report only all year
EFF1DichlorobromomethaneMO AVG <= 46 ug/L all year
EFF1DichlorobromomethaneDAILY MX <= 79 ug/L all year
EFF1Carbon tetrachlorideDAILY MX report only all year
EFF1BromoformDAILY MX report only all year
EFF1DibromochloromethaneMO AVG <= 18 ug/L all year
EFF1DibromochloromethaneDAILY MX <= 45 ug/L all year
EFF1ChloroformDAILY MX 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
EFF1Chlorine, total residual4A <= .011 mg/L all year
EFF1Chlorine, total residual1I <= .019 mg/L all year
EFF1Solids, total dissolvedDAILY MX report only May, Jun, Jul, Aug, Sep, Oct
EFF1Coliform, total general7C <= 23 MPN/100mL Jan, Feb, Mar, Apr, Nov, Dec
EFF1Coliform, total generalINST MAX <= 240 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
EFF1Coliform, total general3E <= 240 MPN/100mL Jan, Feb, Mar, Apr, Nov, Dec
EFF1Coliform, total general7C <= 2.2 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
EFF1Coliform, total general3E <= 23 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
EFF1BOD, 5-day, percent removalMO MIN >= 85 % all year
EFF1Solids, suspended percent removalMO MIN >= 85 % all year
EFF1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 0 pass=0;fail=1 all year
EFF1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia 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