Mountain House Community Services District

NPDES permit CA0084271 · Major POTW · effective, expires 2028-07-31 · 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

3values over a limit
0required values missing, on 0 form(s)
3of 32 forms filed late

Last period with anything received: 2026-07-31. Most often over: Temp. diff. between samp. & upstrm deg. F (2), Mercury, total recoverable (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 (59)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitINST MAX report only all year
001Temp. diff. between samp. & upstrm deg. FMAXIMUM <= 20 deg F all year
001Specific conductanceANNL AVG report only all year
001Specific conductanceDAILY MX report only all year
001Oxygen, dissolved [DO]INST MIN report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 10 mg/L all year
001Solids, total suspendedWKLY AVG <= 15 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= .9 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 1.9 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]WKLY AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG <= 10 mg/L all year
001Nitrite + Nitrate total [as N]WKLY AVG <= 16 mg/L all year
001Carbon, dissolved organic [as C]DAILY MX report only all year
001Carbon, dissolved organic [as C]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001DichlorobromomethaneMO AVG <= 1.7 ug/L all year
001DichlorobromomethaneDAILY MX <= 4.4 ug/L all year
001DibromochloromethaneMO AVG <= 2.1 ug/L all year
001DibromochloromethaneDAILY MX <= 5.3 ug/L all year
001DiazinonDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Diazinon + ChlorpyrifosMO AVG <= 1 Ratio all year
001Diazinon + ChlorpyrifosWKLY AVG <= 1 Ratio all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total recoverableDAILY MX report only all year
001Mercury, total recoverableDAILY MX report only all year
001Mercury, total recoverableANNL TOT <= 4.7 g/yr all year
001Mercury, total recoverableANNL TOT <= .37 g/yr all year
001Coliform, total general7C <= 2.2 MPN/100mL all year
001Coliform, total general3E <= 23 MPN/100mL all year
001Coliform, total generalMW <= 240 MPN/100mL all year
001MethylmercuryDAILY MX report only all year
001MethylmercuryDAILY MX report only all year
001MethylmercuryANNL TOT report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001ChlorpyrifosDAILY MX report only all year
001Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaVALUE <= 0 pass=0;fail=1 all year
001Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaVALUE <= 0 pass=0;fail=1 all year
001Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaMAXIMUM report only all year
001Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaMAXIMUM report only all year
INFSpecific conductanceMO AVG report only all year
INFSpecific conductanceDAILY MX report only all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFBOD, 5-day, 20 deg. CDAILY MX report only all year
INFpHMINIMUM report only all year
INFpHMAXIMUM report only all year
INFSolids, total suspendedMO AVG report only all year
INFSolids, total suspendedDAILY MX report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY MX report only all year
INFSolids, total dissolvedMO AVG report only all year
INFSolids, total dissolvedDAILY 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