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Waterbury WPCF

Sewage treatment plant, major discharger, Waterbury, Connecticut. NPDES permit CT0100625 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 9 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form 1 monthly (31 values), outfall 002 form 1 monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 5 required values missing, 2 of 24 reports late

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

Period endingParameterReportedLimitOver by
March 2026Zinc, total [as Zn], daily maximum10.614 kg/d≤ 8.92 kg/d19%
March 2026Zinc, total [as Zn], monthly average7.417 kg/d≤ 5.946 kg/d25%
July 2026Nickel, total [as Ni], monthly average4.95 kg/d≤ 3.25 kg/d52%
July 2026Ultraviolet light dosage, instantaneous minimum0 mW-sec/cm2≥ 30 mW-sec/cm2100%
August 2026Nickel, total [as Ni], monthly average4.32 kg/d≤ 3.25 kg/d33%
August 2026Ultraviolet light dosage, instantaneous minimum0 mW-sec/cm2≥ 30 mW-sec/cm2100%
August 2026Zinc, total [as Zn], daily maximum9.271 kg/d≤ 8.92 kg/d4%
September 2026Nickel, total [as Ni], daily maximum7.72 kg/d≤ 6.52 kg/d18%
September 2026Nickel, total [as Ni], monthly average4.32 kg/d≤ 3.25 kg/d33%

Limits in force (85)

ParameterStatisticLimitMonthsOutfall
Flow ratemonthly averagereport only (MGD)all year001
Flow ratedaily maximumreport only (MGD)all year001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cdaily maximum≤ 25 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Feb, May, Aug, Nov001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 18 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)Feb, May, Aug, Nov001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Phosphorus, total [as P]monthly averagereport only (mg/L)Apr–Oct001
Phosphorus, total [as P]monthly average≤ .28 mg/LApr–Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Feb, Mar, Nov, Dec001
Phosphorus, total [as P]daily maximum≤ .62 mg/LApr–Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Feb, Mar, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Cyanide, total [as CN]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Cyanide, free [amenable to chlorination]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Arsenic, total [as As]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Beryllium, total [as Be]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Cadmium, total [as Cd]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Chromium, hexavalent [as Cr]instantaneous maximumreport only (mg/L)Feb, May, Aug, Nov001
Chromium, total [as Cr]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Iron, total [as Fe]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Lead, total [as Pb]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Thallium, total [as Tl]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]monthly average≤ 3.25 kg/dall year001
Nickel, total [as Ni]daily maximum≤ 6.52 kg/dall year001
Nickel, total [as Ni]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Silver, total [as Ag]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]monthly average≤ 5.946 kg/dall year001
Zinc, total [as Zn]daily maximum≤ 8.92 kg/dall year001
Zinc, total [as Zn]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Antimony, total [as Sb]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Aluminum, total [as Al]monthly average≤ 9.471 kg/dall year001
Aluminum, total [as Al]daily maximum≤ 20.416 kg/dall year001
Aluminum, total [as Al]monthly averagereport only (kg/d)all year001
Aluminum, total [as Al]daily maximumreport only (kg/d)all year001
Aluminum, total [as Al]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Selenium, total [as Se]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Polychlorinated biphenyls [PCBs]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Phenolsdaily maximumreport only (mg/L)Feb, May, Aug, Nov001
Chlorine, total residualdaily maximumreport only (mg/L)Feb, May, Aug, Nov001
E. coli30-day geometric mean≤ 126 #/100mLMay–Sep001
E. colimaximum≤ 410 #/100mLMay–Sep001
Phosphorus, Total [Avg Seasonal Load Cap]monthly average≤ 34.26 lb/dOct001
Arsenic, sludge tot. dry wt [as As]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Beryllium, sludge, tot. dry wt [as Be]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Ultraviolet light dosageinstantaneous minimum≥ 30 mW-sec/cm2May–Sep001
Solids, fixed, % of total solidsminimumreport only (%)Feb, Apr, Jun, Aug, Oct, Dec001
Solids, volatile % of total solidsminimumreport only (%)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, total [as Hg]daily maximumreport only (mg/L)Feb, May, Aug, Nov001
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Lead, sludge, total, dry weight [as Pb]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Chromium, sludge, total, dry weight [as Cr]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)Feb, Apr, Jun, Aug, Oct, Dec001
Solids, sludge, total, dry weightminimumreport only (%)Feb, Apr, Jun, Aug, Oct, Dec001
BOD, 5-day, percent removalminimum % removal≥ 85 %all year001
Solids, suspended percent removalminimum % removal≥ 85 %all year001
NOAEL Static 48Hr Acute D. pulexminimum≥ 90 % survivalFeb, May, Aug, Nov001
NOAEL Static 48Hr Acute Pimephales promelasminimum≥ 90 % survivalFeb, May, Aug, Nov001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Flow, maximum during 24 hr perioddaily maximumreport only (MGD)all year002
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year002
E. coliinstantaneous maximumreport only (#/100mL)all year002
Duration of dischargedaily maximumreport only (d)all year002

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CT0100625 · MCP: https://passage-data.com/mcp