NORWICH WPCF

NPDES permit CT0100412 · Major POTW · effective, expires 2030-04-30 · 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

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: Enterococci (2), Chlorine, total residual (1), pH (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (183)

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 Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
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 Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Solids, total suspendedDAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, nitrite total [as N]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
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
001Nitrogen, nitrate total [as N]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only Jan, Apr, Jul, Oct
001Phosphorus, total [as P]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Cyanide, total [as CN]DAILY MX report only Jan, Apr, Jul, Oct
001Cyanide, total [as CN]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Cyanide, free [amenable to chlorination]DAILY MX report only Jan, Apr, Jul, Oct
001Cyanide, free [amenable to chlorination]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Arsenic, total [as As]DAILY MX report only Jan, Apr, Jul, Oct
001Arsenic, total [as As]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Beryllium, total [as Be]DAILY MX report only Jan, Apr, Jul, Oct
001Beryllium, total [as Be]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Cadmium, total [as Cd]DAILY MX report only Jan, Apr, Jul, Oct
001Cadmium, total [as Cd]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Chromium, hexavalent [as Cr]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Chromium, hexavalent [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
001Chromium, total [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
001Chromium, total [as Cr]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Copper, total [as Cu]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Copper, total [as Cu]DAILY MX report only Jan, Apr, Jul, Oct
001Iron, total [as Fe]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Iron, total [as Fe]DAILY MX report only Jan, Apr, Jul, Oct
001Lead, total [as Pb]DAILY MX report only Jan, Apr, Jul, Oct
001Lead, total [as Pb]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Thallium, total [as Tl]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Thallium, total [as Tl]DAILY MX report only Jan, Apr, Jul, Oct
001Nickel, total [as Ni]DAILY MX report only Jan, Apr, Jul, Oct
001Nickel, total [as Ni]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Silver, total [as Ag]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Silver, total [as Ag]DAILY MX report only Jan, Apr, Jul, Oct
001Zinc, total [as Zn]DAILY MX report only Jan, Apr, Jul, Oct
001Zinc, total [as Zn]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Antimony, total [as Sb]DAILY MX report only Jan, Apr, Jul, Oct
001Antimony, total [as Sb]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Aluminum, total [as Al]DAILY MX report only Jan, Apr, Jul, Oct
001Aluminum, total [as Al]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Selenium, total [as Se]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Selenium, total [as Se]DAILY MX report only Jan, Apr, Jul, Oct
001Coliform, fecal - % samples exceeding limitMAXIMUM <= 10 % May, Jun, Jul, Aug, Sep, Oct
001Polychlorinated biphenyls [PCBs]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001PhenolsDAILY MX report only Jan, Apr, Jul, Oct
001PhenolsDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Chlorine, total residualINST MIN >= .05 mg/L May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualINST MAX <= 1.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualDAILY MX report only Jan, Apr, Jul, Oct
001Chlorine, total residualDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Enterococci30DA GEO <= 35 #/100mL May, Jun, Jul, Aug, Sep, Oct
001EnterococciMAXIMUM <= 500 #/100mL May, Jun, Jul, Aug, Sep, Oct
001Arsenic, sludge tot. dry wt [as As]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Beryllium, sludge, tot. dry wt [as Be]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Ultraviolet light dosageINST MIN >= 30 mW-sec/cm2 May, Jun, Jul, Aug, Sep, Oct
001Solids, total, percentMINIMUM report only Jan, Mar, May, Jul, Sep, Nov
001Solids, fixed, % of total solidsMINIMUM report only Jan, Mar, May, Jul, Sep, Nov
001Solids, volatile % of total solidsMINIMUM report only Jan, Mar, May, Jul, Sep, Nov
001Mercury, total [as Hg]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001Mercury, total [as Hg]DAILY MX report only Jan, Apr, Jul, Oct
001Coliform, fecal general30DA GEO <= 88 #/100L May, Jun, Jul, Aug, Sep, Oct
001Zinc, sludge, total, dry weight [as Zn]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Lead, sludge, total, dry weight [as Pb]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Nickel, sludge, total, dry weight [as Ni]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Mercury, sludge, total, dry weight [as Hg]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Chromium, sludge, total, dry weight [as Cr]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Copper, sludge, total, dry weight [as Cu]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001Cadmium, sludge, total, dry weight [as Cd]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
001BOD, carbonaceous [5 day, 5 C]DAILY 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. pulexDAILY MN report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001NOAEL Static 48Hr Acute D. pulexDAILY MN >= 90 % survival Jan, Apr, Jul, Oct
001NOAEL Static 48Hr Acute Pimephales promelasDAILY MN report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
001NOAEL Static 48Hr Acute Pimephales promelasDAILY MN >= 90 % survival Jan, Apr, Jul, Oct
002Flow rateMO AVG report only all year
002Flow rateDAILY MX report only all year
002BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CDAILY MX <= 50 mg/L all year
002BOD, 5-day, 20 deg. CMO AVG report only all year
002BOD, 5-day, 20 deg. CDAILY MX report only Jan, Apr, Jul, Oct
002BOD, 5-day, 20 deg. CDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002pHINST MIN >= 6 SU all year
002pHINST MAX <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 50 mg/L all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedDAILY MX report only Jan, Apr, Jul, Oct
002Solids, total suspendedDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Nitrogen, total [as N]DAILY MX report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only Jan, Apr, Jul, Oct
002Nitrogen, ammonia total [as N]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Nitrogen, nitrite total [as N]DAILY MX report only Jan, Apr, Jul, Oct
002Nitrogen, nitrite total [as N]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Nitrogen, nitrate total [as N]DAILY MX report only Jan, Apr, Jul, Oct
002Nitrogen, nitrate total [as N]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Phosphorus, total [as P]DAILY MX report only all year
002Phosphorus, total [as P]DAILY MX report only Jan, Apr, Jul, Oct
002Phosphorus, total [as P]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Cyanide, total [as CN]DAILY MX report only Jan, Apr, Jul, Oct
002Cyanide, total [as CN]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Cyanide, free [amenable to chlorination]DAILY MX report only Jan, Apr, Jul, Oct
002Cyanide, free [amenable to chlorination]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Arsenic, total [as As]DAILY MX report only Jan, Apr, Jul, Oct
002Arsenic, total [as As]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Beryllium, total [as Be]DAILY MX report only Jan, Apr, Jul, Oct
002Beryllium, total [as Be]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Cadmium, total [as Cd]DAILY MX report only Jan, Apr, Jul, Oct
002Cadmium, total [as Cd]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Chromium, hexavalent [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
002Chromium, hexavalent [as Cr]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Chromium, total [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
002Chromium, total [as Cr]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Copper, total [as Cu]DAILY MX report only Jan, Apr, Jul, Oct
002Copper, total [as Cu]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Iron, total [as Fe]DAILY MX report only Jan, Apr, Jul, Oct
002Iron, total [as Fe]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Lead, total [as Pb]DAILY MX report only Jan, Apr, Jul, Oct
002Lead, total [as Pb]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Thallium, total [as Tl]DAILY MX report only Jan, Apr, Jul, Oct
002Thallium, total [as Tl]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Nickel, total [as Ni]DAILY MX report only Jan, Apr, Jul, Oct
002Nickel, total [as Ni]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Silver, total [as Ag]DAILY MX report only Jan, Apr, Jul, Oct
002Silver, total [as Ag]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Zinc, total [as Zn]DAILY MX report only Jan, Apr, Jul, Oct
002Zinc, total [as Zn]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Antimony, total [as Sb]DAILY MX report only Jan, Apr, Jul, Oct
002Antimony, total [as Sb]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Aluminum, total [as Al]DAILY MX report only Jan, Apr, Jul, Oct
002Aluminum, total [as Al]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Selenium, total [as Se]DAILY MX report only Jan, Apr, Jul, Oct
002Selenium, total [as Se]DAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Coliform, fecal - % samples exceeding limitMAXIMUM <= 10 % May, Jun, Jul, Aug, Sep, Oct
002Polychlorinated biphenyls [PCBs]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002PhenolsDAILY MX report only Jan, Apr, Jul, Oct
002PhenolsDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Chlorine, total residualMO AVG <= .05 ug/L May, Jun, Jul, Aug, Sep, Oct
002Chlorine, total residualINST MAX <= 1.5 ug/L May, Jun, Jul, Aug, Sep, Oct
002Chlorine, total residualDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002Chlorine, free availableDAILY MX report only Jan, Apr, Jul, Oct
002Enterococci30DA GEO <= 35 #/100mL May, Jun, Jul, Aug, Sep, Oct
002EnterococciMAXIMUM <= 500 #/100mL May, Jun, Jul, Aug, Sep, Oct
002Arsenic, sludge tot. dry wt [as As]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Beryllium, sludge, tot. dry wt [as Be]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Ultraviolet light dosageINST MIN >= 30 mW-sec/cm2 May, Jun, Jul, Aug, Sep, Oct
002Solids, total, percentMINIMUM report only Jan, Mar, May, Jul, Sep, Nov
002Solids, fixed, % of total solidsMINIMUM report only Jan, Mar, May, Jul, Sep, Nov
002Solids, volatile % of total solidsMINIMUM report only Jan, Mar, May, Jul, Sep, Nov
002Mercury, total [as Hg]DAILY MX report only Jan, Feb, Apr, May, Jul, Aug, Oct, Nov
002Mercury, total [as Hg]DAILY MX report only Mar, Jun, Sep, Dec
002Coliform, fecal general30DA GEO <= 88 #/100mL May, Jun, Jul, Aug, Sep, Oct
002Zinc, sludge, total, dry weight [as Zn]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Lead, sludge, total, dry weight [as Pb]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Nickel, sludge, total, dry weight [as Ni]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Mercury, sludge, total, dry weight [as Hg]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Chromium, sludge, total, dry weight [as Cr]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Copper, sludge, total, dry weight [as Cu]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002Cadmium, sludge, total, dry weight [as Cd]INST MAX report only Jan, Mar, May, Jul, Sep, Nov
002BOD, carbonaceous [5 day, 5 C]MO AVG report only all year
002BOD, carbonaceous [5 day, 5 C]DAILY MX report only all year
002BOD, 5-day, percent removalINST MIN >= 85 % all year
002Solids, suspended percent removalINST MIN >= 85 % all year
002NOAEL Static 48Hr Acute D. pulexINST MIN >= 90 % survival Jan, Apr, Jul, Oct
002NOAEL Static 48Hr Acute D. pulexDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec
002NOAEL Static 48Hr Acute Pimephales promelasINST MIN >= 90 % survival Jan, Apr, Jul, Oct
002NOAEL Static 48Hr Acute Pimephales promelasDAILY MX report only Feb, Mar, May, Jun, Aug, Sep, Nov, Dec

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