WILLIAMSON, CITY OF

NPDES permit WV0026271 · Major POTW · effective, expires 2028-04-24 · EPA's file as of 2026-09-19

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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

15values over a limit
0required values missing, on 0 form(s)
0of 34 forms filed late

Last period with anything received: 2026-07-31. Most often over: Bromodichloromethane, effluent (8), Cyanide, weak acid, dissociable (4), Coliform, fecal general (2).

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among WV permits in EPA's filings — check your permit).

Limits in force (127)

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 <= 260 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 519 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 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 <= 260 lb/d all year
001Solids, total suspendedDAILY MX <= 519 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 11 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 22 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 95 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 190 lb/d all year
001Cyanide, weak acid, dissociableMO AVG <= .004 mg/L all year
001Cyanide, weak acid, dissociableDAILY MX <= .0058 mg/L all year
001Arsenic, total [as As]MO AVG report only all year
001Arsenic, total [as As]DAILY MX report only all year
001Chromium, hexavalent [as Cr]MO AVG report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Nickel, total recoverableMO AVG report only all year
001Nickel, total recoverableDAILY MX report only all year
001Silver total recoverableMO AVG report only all year
001Silver total recoverableDAILY MX report only all year
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Cadmium, total recoverableMO AVG report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX report only all year
001Bromodichloromethane, effluentMO AVG <= .001 mg/L all year
001Bromodichloromethane, effluentDAILY MX <= .0016 mg/L all year
001Flow, in conduit or thru treatment plantMINIMUM 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
001Chlorine, total residualMO AVG <= .028 mg/L all year
001Chlorine, total residualDAILY MX <= .057 mg/L all year
001Toxicity [chronic], Ceriodaphnia dubiaMO AVG report only all year
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MO AVG report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]DAILY 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
IU01Flow rateMO AVG report only all year
IU01Flow rateDAILY MX <= 50000 gal/d all year
IU01BOD, 5-day, 20 deg. CMO AVG report only all year
IU01BOD, 5-day, 20 deg. CDAILY MX report only all year
IU01BOD, 5-day, 20 deg. CMO AVG report only all year
IU01BOD, 5-day, 20 deg. CDAILY MX <= 50 lb/d all year
IU01pHINST MIN >= 5 SU all year
IU01pHINST MAX <= 10 SU all year
IU01Solids, total suspendedMO AVG report only all year
IU01Solids, total suspendedDAILY MX report only all year
IU01Solids, total suspendedMO AVG report only all year
IU01Solids, total suspendedDAILY MX <= 50 lb/d all year
IU01Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
IU01Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
IU01Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
IU01Nitrogen, Kjeldahl, total [as N]DAILY MX <= 10 lb/d all year
IU01Cyanide, total [as CN]MO AVG report only all year
IU01Cyanide, total [as CN]DAILY MX report only all year
IU01Cyanide, total [as CN]MO AVG report only all year
IU01Cyanide, total [as CN]DAILY MX <= .009 lb/d all year
IU01Arsenic, total [as As]MO AVG report only all year
IU01Arsenic, total [as As]DAILY MX report only all year
IU01Arsenic, total [as As]MO AVG report only all year
IU01Arsenic, total [as As]DAILY MX <= .006 lb/d all year
IU01Cadmium, total [as Cd]MO AVG report only all year
IU01Cadmium, total [as Cd]DAILY MX report only all year
IU01Cadmium, total [as Cd]MO AVG report only all year
IU01Cadmium, total [as Cd]DAILY MX <= .0016 lb/d all year
IU01Chromium, total [as Cr]MO AVG report only all year
IU01Chromium, total [as Cr]DAILY MX report only all year
IU01Chromium, total [as Cr]MO AVG report only all year
IU01Chromium, total [as Cr]DAILY MX <= .02 lb/d all year
IU01Copper, total [as Cu]MO AVG report only all year
IU01Copper, total [as Cu]DAILY MX report only all year
IU01Copper, total [as Cu]MO AVG report only all year
IU01Copper, total [as Cu]DAILY MX <= .07 lb/d all year
IU01Lead, total [as Pb]MO AVG report only all year
IU01Lead, total [as Pb]DAILY MX report only all year
IU01Lead, total [as Pb]MO AVG report only all year
IU01Lead, total [as Pb]DAILY MX <= .01 lb/d all year
IU01Nickel, total [as Ni]MO AVG report only all year
IU01Nickel, total [as Ni]DAILY MX report only all year
IU01Nickel, total [as Ni]MO AVG report only all year
IU01Nickel, total [as Ni]DAILY MX <= .03 lb/d all year
IU01Silver, total [as Ag]MO AVG report only all year
IU01Silver, total [as Ag]DAILY MX report only all year
IU01Silver, total [as Ag]MO AVG report only all year
IU01Silver, total [as Ag]DAILY MX <= .01 lb/d all year
IU01Zinc, total [as Zn]MO AVG report only all year
IU01Zinc, total [as Zn]DAILY MX report only all year
IU01Zinc, total [as Zn]MO AVG report only all year
IU01Zinc, total [as Zn]DAILY MX <= .07 lb/d all year
IU01Mercury, total recoverableMO AVG report only all year
IU01Mercury, total recoverableDAILY MX report only all year
IU01Mercury, total recoverableMO AVG report only all year
IU01Mercury, total recoverableDAILY MX <= .0001 lb/d all year
IU09Flow rateMO AVG report only all year
IU09Flow rateDAILY MX <= 60000 gal/d all year
IU09Solids, total suspendedMO AVG report only all year
IU09Solids, total suspendedDAILY MX <= 500 mg/L all year
IU09Solids, total suspendedMO AVG report only all year
IU09Solids, total suspendedDAILY MX report only all year
IU09Copper, total [as Cu]MO AVG report only all year
IU09Copper, total [as Cu]DAILY MX < .05 mg/L all year
IU09Copper, total [as Cu]MO AVG report only all year
IU09Copper, total [as Cu]DAILY MX report only all year
IU09Iron, total [as Fe]MO AVG report only all year
IU09Iron, total [as Fe]DAILY MX report only all year
IU09Iron, total [as Fe]MO AVG report only all year
IU09Iron, total [as Fe]DAILY MX report only all year
IU09Zinc, total [as Zn]MO AVG report only all year
IU09Zinc, total [as Zn]DAILY MX report only all year
IU09Zinc, total [as Zn]MO AVG report only all year
IU09Zinc, total [as Zn]DAILY MX report only all year
IU09Aluminum, total [as Al]MO AVG report only all year
IU09Aluminum, total [as Al]DAILY MX report only all year
IU09Aluminum, total [as Al]MO AVG report only all year
IU09Aluminum, total [as Al]DAILY 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