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Norwich WPCF

Sewage treatment plant, major discharger, Norwich, Connecticut. NPDES permit CT0100412, in force until Apr 30, 2030. Last 12 months: over a limit 5 times (last September 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form 1 monthly (63 values), outfall 002 form 1 monthly (63 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 3 required values missing, 3 of 24 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingOutfallParameterReportedLimitOver by
November 2025001pH, instantaneous minimum5.7 SU≥ 6 SU—
July 2026001Enterococci, maximum> 2419.6 #/100mL≤ 500 #/100mL—
July 2026002Chlorine, total residual, monthly average.1 ug/L≤ .05 ug/L100%
July 2026002Enterococci, maximum> 2419.6 #/100mL≤ 500 #/100mL—
September 2026002Chlorine, total residual, monthly average.1 ug/L≤ .05 ug/L100%

Limits in force (181)

ParameterStatisticLimitMonthsOutfall
Flow ratemonthly averagereport only (MGD)all year001
Flow ratedaily maximumreport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Apr, Jul, Oct001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 50 mg/Lall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Apr, Jul, Oct001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct001
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct001
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct001
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Cyanide, total [as CN]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Cyanide, total [as CN]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Arsenic, total [as As]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Arsenic, total [as As]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Beryllium, total [as Be]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Beryllium, total [as Be]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Cadmium, total [as Cd]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Cadmium, total [as Cd]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Chromium, total [as Cr]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Chromium, total [as Cr]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Copper, total [as Cu]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Copper, total [as Cu]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Iron, total [as Fe]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Iron, total [as Fe]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Lead, total [as Pb]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Lead, total [as Pb]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Thallium, total [as Tl]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Thallium, total [as Tl]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Nickel, total [as Ni]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Nickel, total [as Ni]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Silver, total [as Ag]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Silver, total [as Ag]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Zinc, total [as Zn]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Zinc, total [as Zn]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Antimony, total [as Sb]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Antimony, total [as Sb]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Aluminum, total [as Al]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Aluminum, total [as Al]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Selenium, total [as Se]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Selenium, total [as Se]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–Oct001
Polychlorinated biphenyls [PCBs]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Phenolsdaily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Phenolsdaily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Chlorine, total residualinstantaneous minimum≥ .05 mg/LMay–Oct001
Chlorine, total residualinstantaneous maximum≤ 1.5 mg/LMay–Oct001
Chlorine, total residualdaily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Chlorine, total residualdaily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Enterococci30-day geometric mean≤ 35 #/100mLMay–Oct001
Enterococcimaximum≤ 500 #/100mLMay–Oct001
Arsenic, sludge tot. dry wt [as As]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Beryllium, sludge, tot. dry wt [as Be]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Ultraviolet light dosageinstantaneous minimum≥ 30 mW-sec/cm2May–Oct001
Solids, total, percentminimumreport only (%)Jan, Mar, May, Jul, Sep, Nov001
Solids, fixed, % of total solidsminimumreport only (%)Jan, Mar, May, Jul, Sep, Nov001
Solids, volatile % of total solidsminimumreport only (%)Jan, Mar, May, Jul, Sep, Nov001
Mercury, total [as Hg]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
Mercury, total [as Hg]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct001
Coliform, fecal general30-day geometric mean≤ 88 #/100LMay–Oct001
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Lead, sludge, total, dry weight [as Pb]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Chromium, sludge, total, dry weight [as Cr]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov001
BOD, carbonaceous [5 day, 5 C]daily maximumreport only (mg/L)all year001
BOD, 5-day, percent removalminimum % removal≥ 85 %all year001
Solids, suspended percent removalminimum % removal≥ 85 %all year001
NOAEL Static 48Hr Acute D. pulexdaily minimumreport only (% survival)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
NOAEL Static 48Hr Acute D. pulexdaily minimum≥ 90 % survivalJan, Apr, Jul, Oct001
NOAEL Static 48Hr Acute Pimephales promelasdaily minimumreport only (% survival)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec001
NOAEL Static 48Hr Acute Pimephales promelasdaily minimum≥ 90 % survivalJan, Apr, Jul, Oct001
Flow ratemonthly averagereport only (MGD)all year002
Flow ratedaily maximumreport only (MGD)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendeddaily maximum≤ 50 mg/Lall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
Solids, total suspendeddaily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Nitrogen, total [as N]daily maximumreport only (lb/d)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
Phosphorus, total [as P]daily maximumreport only (mg/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Cyanide, total [as CN]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Cyanide, total [as CN]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Arsenic, total [as As]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Arsenic, total [as As]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Beryllium, total [as Be]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Beryllium, total [as Be]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Cadmium, total [as Cd]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Cadmium, total [as Cd]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Chromium, total [as Cr]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Chromium, total [as Cr]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Copper, total [as Cu]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Copper, total [as Cu]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Iron, total [as Fe]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Iron, total [as Fe]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Lead, total [as Pb]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Lead, total [as Pb]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Thallium, total [as Tl]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Thallium, total [as Tl]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Nickel, total [as Ni]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Nickel, total [as Ni]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Silver, total [as Ag]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Silver, total [as Ag]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Zinc, total [as Zn]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Zinc, total [as Zn]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Antimony, total [as Sb]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Antimony, total [as Sb]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Aluminum, total [as Al]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Aluminum, total [as Al]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Selenium, total [as Se]daily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Selenium, total [as Se]daily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–Oct002
Polychlorinated biphenyls [PCBs]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Phenolsdaily maximumreport only (ug/L)Jan, Apr, Jul, Oct002
Chlorine, total residualmonthly average≤ .05 ug/LMay–Oct002
Chlorine, total residualinstantaneous maximum≤ 1.5 ug/LMay–Oct002
Chlorine, total residualdaily maximumreport only (ug/L)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
Chlorine, free availabledaily maximumreport only (mg/L)Jan, Apr, Jul, Oct002
Enterococci30-day geometric mean≤ 35 #/100mLMay–Oct002
Enterococcimaximum≤ 500 #/100mLMay–Oct002
Arsenic, sludge tot. dry wt [as As]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Beryllium, sludge, tot. dry wt [as Be]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Ultraviolet light dosageinstantaneous minimum≥ 30 mW-sec/cm2May–Oct002
Solids, total, percentminimumreport only (%)Jan, Mar, May, Jul, Sep, Nov002
Solids, fixed, % of total solidsminimumreport only (%)Jan, Mar, May, Jul, Sep, Nov002
Solids, volatile % of total solidsminimumreport only (%)Jan, Mar, May, Jul, Sep, Nov002
Mercury, total [as Hg]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec002
Coliform, fecal general30-day geometric mean≤ 88 #/100mLMay–Oct002
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Lead, sludge, total, dry weight [as Pb]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Chromium, sludge, total, dry weight [as Cr]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)Jan, Mar, May, Jul, Sep, Nov002
BOD, carbonaceous [5 day, 5 C]monthly averagereport only (mg/L)all year002
BOD, carbonaceous [5 day, 5 C]daily maximumreport only (mg/L)all year002
BOD, 5-day, percent removalinstantaneous minimum≥ 85 %all year002
Solids, suspended percent removalinstantaneous minimum≥ 85 %all year002
NOAEL Static 48Hr Acute D. pulexinstantaneous minimum≥ 90 % survivalJan, Apr, Jul, Oct002
NOAEL Static 48Hr Acute D. pulexdaily maximumreport only (%)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002
NOAEL Static 48Hr Acute Pimephales promelasinstantaneous minimum≥ 90 % survivalJan, Apr, Jul, Oct002
NOAEL Static 48Hr Acute Pimephales promelasdaily maximumreport only (%)Feb, Mar, May, Jun, Aug, Sep, Nov, Dec002

How strict are these limits?

Cited limits by parameter: Connecticut's rules and the federal ones.

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