NORWALK WPCF

NPDES permit CT0101249 · 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

4values over a limit
0required values missing, on 0 form(s)
0of 24 forms filed late

Last period with anything received: 2026-08-31. Most often over: Solids, total suspended (2), Enterococci (1), BOD, 5-day, 20 deg. C (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 (97)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 40 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only Mar, Jun, Sep, Dec
001BOD, 5-day, 20 deg. CDAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 40 mg/L all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only Mar, Jun, Sep, Dec
001Nitrogen, total [as N]ROLL AVG <= 1105 lb/d all year
001Nitrogen, total [as N]MO MAX report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only Mar, Jun, Sep, Dec
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Nitrogen, nitrite total [as N]DAILY MX report only Mar, Jun, Sep, Dec
001Nitrogen, nitrite total [as N]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Nitrogen, nitrate total [as N]DAILY MX report only Mar, Jun, Sep, Dec
001Nitrogen, nitrate total [as N]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only Mar, Jun, Sep, Dec
001Phosphorus, total [as P]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Cyanide, total [as CN]DAILY MX report only Mar, Jun, Sep, Dec
001Cyanide, total [as CN]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Cyanide, free [amenable to chlorination]DAILY MX report only Mar, Jun, Sep, Dec
001Cyanide, free [amenable to chlorination]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Arsenic, total [as As]DAILY MX report only Mar, Jun, Sep, Dec
001Arsenic, total [as As]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Barium, total [as Ba]DAILY MX report only Mar, Jun, Sep, Dec
001Barium, total [as Ba]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Beryllium, total [as Be]DAILY MX report only Mar, Jun, Sep, Dec
001Beryllium, total [as Be]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Cadmium, total [as Cd]DAILY MX report only Mar, Jun, Sep, Dec
001Cadmium, total [as Cd]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Chromium, hexavalent [as Cr]DAILY MX report only Mar, Jun, Sep, Dec
001Chromium, hexavalent [as Cr]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Chromium, total [as Cr]DAILY MX report only Mar, Jun, Sep, Dec
001Chromium, total [as Cr]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Copper, total [as Cu]DAILY MX report only Mar, Jun, Sep, Dec
001Copper, total [as Cu]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Iron, total [as Fe]DAILY MX report only Mar, Jun, Sep, Dec
001Iron, total [as Fe]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Lead, total [as Pb]DAILY MX report only Mar, Jun, Sep, Dec
001Lead, total [as Pb]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Thallium, total [as Tl]DAILY MX report only Mar, Jun, Sep, Dec
001Thallium, total [as Tl]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Nickel, total [as Ni]DAILY MX report only Mar, Jun, Sep, Dec
001Nickel, total [as Ni]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Silver, total [as Ag]DAILY MX report only Mar, Jun, Sep, Dec
001Silver, total [as Ag]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Zinc, total [as Zn]DAILY MX report only Mar, Jun, Sep, Dec
001Zinc, total [as Zn]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Aluminum, total [as Al]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Aluminum, total [as Al]DAILY MX report only Mar, Jun, Sep, Dec
001Selenium, total [as Se]DAILY MX report only Mar, Jun, Sep, Dec
001Selenium, total [as Se]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Coliform, fecal - % samples exceeding limitDAILY MX <= 10 % all year
001Polychlorinated biphenyls [PCBs]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001PhenolsDAILY MX report only Mar, Jun, Sep, Dec
001PhenolsDAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Chlorine, total residualDAILY MX <= .07 mg/L all year
001Chlorine, total residualDAILY MX report only Mar, Jun, Sep, Dec
001Chlorine, total residualDAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Enterococci30DA GEO <= 35 #/100mL all year
001EnterococciMAXIMUM <= 500 #/100mL all year
001Arsenic, sludge tot. dry wt [as As]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Beryllium, sludge, tot. dry wt [as Be]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Solids, total, percentINST MIN report only Jan, Mar, May, Jul, Sep, Nov
001Solids, fixed, % of total solidsINST MIN report only Jan, Mar, May, Jul, Sep, Nov
001Solids, volatile % of total solidsINST MIN report only Jan, Mar, May, Jul, Sep, Nov
001Mercury, total [as Hg]DAILY MX report only Mar, Jun, Sep, Dec
001Mercury, total [as Hg]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001Coliform, fecal general30DA GEO <= 88 #/100mL all year
001Zinc, sludge, total, dry weight [as Zn]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Lead, sludge, total, dry weight [as Pb]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Nickel, sludge, total, dry weight [as Ni]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Mercury, sludge, total, dry weight [as Hg]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Chromium, sludge, total, dry weight [as Cr]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Copper, sludge, total, dry weight [as Cu]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
001Cadmium, sludge, total, dry weight [as Cd]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
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 Mar, Jun, Sep, Dec
001NOAEL Static 48Hr Acute D. pulexINST MIN report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
001NOAEL Static 48Hr Acute Pimephales promelasINST MIN >= 90 % survival Mar, Jun, Sep, Dec
001NOAEL Static 48Hr Acute Pimephales promelasINST MIN report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
002Flow rateMO AVG report only all year
002BOD, 5-day, 20 deg. CDAILY MX report only all year
002Solids, total suspendedDAILY MX report only all year
002DurationDAILY MX report only all year
002Chlorine, total residualDAILY MX report only all year
002EnterococciDAILY MX report only all year
002Coliform, fecal generalINST MAX 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