MASON, TOWN OF

NPDES permit WV0021849 · Minor POTW · effective, expires 2027-07-11 · 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

32values 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: Coliform, fecal general (13), Nitrogen, ammonia total [as N] (8), Solids, total suspended (4).

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (26)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 60 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 62.5 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 125 lb/d all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 60 mg/L all year
001Solids, total suspendedMO AVG <= 62.5 lb/d all year
001Solids, total suspendedDAILY MX <= 125 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 15 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 31.3 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 62.6 lb/d all year
001Zinc, total recoverableMO AVG <= .124 mg/L all year
001Zinc, total recoverableDAILY MX <= .367 mg/L all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Copper, total recoverableMO AVG <= .022 mg/L all year
001Copper, total recoverableDAILY MX <= .041 mg/L 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
001Coliform, fecal generalMO GEOMN <= 200 #/100mL all year
001Coliform, fecal generalDAILY MX <= 400 #/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % 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