MONTGOMERY COUNTY UD NO. 3 AND MONTGOMERY COUNTY UD NO.4

NPDES permit TX0069469 · Major POTW · effective, expires 2029-02-02 · 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)
1of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (3).

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (23)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 6 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY AV <= 15 mg/L all year
001Solids, total suspendedDAILY MX <= 40 mg/L all year
001Solids, total suspendedDAILY AV <= 119 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 2 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L all year
001Nitrogen, ammonia total [as N]DAILY AV <= 16 lb/d all year
001Phosphorus, total [as P]DAILY AV <= 1 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 4 mg/L all year
001Phosphorus, total [as P]DAILY AV <= 7.9 lb/d all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plant2P <= 1979 gal/min all year
001Flow, in conduit or thru treatment plantANNL AVG <= .95 MGD all year
001Chlorine, total residualMO MIN >= 1 mg/L all year
001Chlorine, total residualMO MAX <= 4 mg/L all year
001E. coliDAILY AV <= 126 MPN/100mL all year
001E. coliDAILY MX <= 399 MPN/100mL all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 7 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 17 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 56 lb/d 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