SEYMOUR WPCF, TOWN OF

NPDES permit CT0100501 · Major POTW · expired, expires 2026-03-31 · 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 2026-03-31 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

1values over a limit
2required values missing, on 1 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: E. coli (1).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among CT permits in EPA's filings — check your permit).

Limits in force (67)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 50 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only Jan, Apr, Jul, Oct
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 <= 50 mg/L all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 15 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 22.5 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, nitrite total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, nitrate total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Phosphate, ortho [as PO4]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= 1.09 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]DAILY MX <= 2.18 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]DAILY MX report only Jan, Apr, Jul, Oct
001Cyanide, total [as CN]DAILY MX report only Jan, Apr, Jul, Oct
001Cyanide, free [amenable to chlorination]DAILY MX report only Jan, Apr, Jul, Oct
001Arsenic, total [as As]DAILY MX report only Jan, Apr, Jul, Oct
001Beryllium, total [as Be]DAILY MX report only Jan, Apr, Jul, Oct
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Cadmium, total [as Cd]DAILY MX report only Jan, Apr, Jul, Oct
001Chromium, hexavalent [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
001Chromium, total [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
001Copper, total [as Cu]DAILY MX report only Jan, Apr, Jul, Oct
001Iron, total [as Fe]DAILY MX report only Jan, Apr, Jul, Oct
001Lead, total [as Pb]DAILY MX report only Jan, Apr, Jul, Oct
001Thallium, total [as Tl]DAILY MX report only Jan, Apr, Jul, Oct
001Nickel, total [as Ni]DAILY MX report only Jan, Apr, Jul, Oct
001Silver, total [as Ag]DAILY MX report only Jan, Apr, Jul, Oct
001Zinc, total [as Zn]DAILY MX report only Jan, Apr, Jul, Oct
001Antimony, total [as Sb]DAILY MX report only Jan, Apr, Jul, Oct
001Aluminum, total [as Al]DAILY MX report only Jan, Apr, Jul, Oct
001Selenium, total [as Se]DAILY MX report only Jan, Apr, Jul, Oct
001Polychlorinated biphenyls [PCBs]INST MAX report only Jan, Apr, Jul, Oct
001PhenolsDAILY MX report only Jan, Apr, Jul, Oct
001Chlorine, total residualAVERAGE <= .05 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualINST MAX <= .1 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualDAILY MX report only Jan, Apr, Jul, Oct
001E. coli30DA GEO <= 126 #/100mL May, Jun, Jul, Aug, Sep
001E. coliMAXIMUM <= 410 #/100mL May, Jun, Jul, Aug, Sep
001Phosphorus, Total [Avg Seasonal Load Cap]MO AVG <= 7.54 lb/d Oct
001Arsenic, sludge tot. dry wt [as As]INST MAX report only Jan, Apr, Jul, Oct
001Beryllium, sludge, tot. dry wt [as Be]INST MAX report only Jan, Apr, Jul, Oct
001Solids, total, percentINST MIN report only Jan, Apr, Jul, Oct
001Solids, fixed, % of total solidsINST MIN report only Jan, Apr, Jul, Oct
001Solids, volatile % of total solidsINST MIN report only Jan, Apr, Jul, Oct
001Mercury, total [as Hg]DAILY MX report only Jan, Apr, Jul, Oct
001Zinc, sludge, total, dry weight [as Zn]INST MAX report only Jan, Apr, Jul, Oct
001Lead, sludge, total, dry weight [as Pb]INST MAX report only Jan, Apr, Jul, Oct
001Nickel, sludge, total, dry weight [as Ni]INST MAX report only Jan, Apr, Jul, Oct
001Mercury, sludge, total, dry weight [as Hg]INST MAX report only Jan, Apr, Jul, Oct
001Chromium, sludge, total, dry weight [as Cr]INST MAX report only Jan, Apr, Jul, Oct
001Copper, sludge, total, dry weight [as Cu]INST MAX report only Jan, Apr, Jul, Oct
001Cadmium, sludge, total, dry weight [as Cd]INST MAX report only Jan, Apr, Jul, Oct
001Carbonaceous BOD, 5 day, 20 deg C filtrdMO AVG report only all year
001Carbonaceous BOD, 5 day, 20 deg C filtrdDAILY MX report only all year
001BOD, 5-day, percent removalMN % RMV >= 85 % all year
001Solids, suspended percent removalMN % RMV >= 85 % all year
001NOAEL Static 48Hr Acute D. pulexINST MIN >= 90 % survival Jan, Apr, Jul, Oct
001NOAEL Static 48Hr Acute Pimephales promelasINST MIN >= 90 % survival Jan, Apr, Jul, Oct

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