WALTHALL POTW

NPDES permit MS0042501 · Minor POTW · expired, expires 2025-07-31 · 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.

This permit expired on 2025-07-31 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
229required values missing, on 11 form(s)
0of 11 forms filed late

Last period with anything received: none.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MS permits in EPA's filings — check your permit).

Limits in force (31)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMO TOTAL report only all year
001BOD, 5-day, 20 deg. CANNL AVG <= 7.3 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO TOTAL report only all year
001BOD, 5-day, 20 deg. CANNL AVG report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 90 mg/L all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedANNL AVG <= 21.7 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedANNL AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 10 mg/L all year
001Nitrogen, ammonia total [as N]ANNL AVG <= 2.4 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO TOTAL report only all year
001Nitrogen, ammonia total [as N]ANNL AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Flow, in conduit or thru treatment plantMO TOTAL report only all year
001Flow, in conduit or thru treatment plantANNL AVG <= .029 MGD all year
001Flow, in conduit or thru treatment plantMO TOTAL report only all year
001Chlorine, total residualMO AVG <= .011 mg/L all year
001E. coliMO AVG <= 126 #/100mL all year
001BOD, 5-day, percent removalMINIMUM >= 65 % all year
001Solids, suspended percent removalMINIMUM >= 65 % 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