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Sewage treatment plant, major discharger, Groton, Connecticut. NPDES permit CT0101184 expired Jul 31, 2023; its limits still apply. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 50 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Solids, total suspended | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Beryllium, total [as Be] | instantaneous maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Coliform, fecal - % samples exceeding limit | instantaneous maximum | < 10 % | all year |
| Polychlorinated biphenyls [PCBs] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Phenols | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Phenols | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Chlorine, total residual | instantaneous minimum | ≥ .2 mg/L | all year |
| Chlorine, total residual | instantaneous maximum | ≤ 1.5 mg/L | all year |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Chlorine, total residual | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Enterococci | 30-day geometric mean | ≤ 35 #/100mL | all year |
| Enterococci | maximum | ≤ 500 #/100mL | all year |
| Arsenic, sludge tot. dry wt [as As] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Beryllium, sludge, tot. dry wt [as Be] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Solids, total, percent | instantaneous minimum | report only (%) | Jan, Apr, Jul, Oct |
| Solids, fixed, % of total solids | instantaneous minimum | report only (%) | Jan, Apr, Jul, Oct |
| Solids, volatile % of total solids | instantaneous minimum | report only (%) | Jan, Apr, Jul, Oct |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Coliform, fecal general | 30-day geometric mean | report only (#/100mL) | all year |
| Coliform, fecal general | 7-day geometric mean | ≤ 88 #/100mL | all year |
| Zinc, sludge, total, dry weight [as Zn] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Lead, sludge, total, dry weight [as Pb] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Nickel, sludge, total, dry weight [as Ni] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Mercury, sludge, total, dry weight [as Hg] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Chromium, sludge, total, dry weight [as Cr] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Copper, sludge, total, dry weight [as Cu] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| Cadmium, sludge, total, dry weight [as Cd] | instantaneous maximum | report only (mg/kg) | Jan, Apr, Jul, Oct |
| BOD, 5-day, percent removal | minimum % removal | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum % removal | ≥ 85 % | all year |
| NOAEL Static 48Hr Acute D. pulex | minimum | report only (% survival) | Jan, Apr, Jul, Oct |
| NOAEL Static 48Hr Acute D. pulex | minimum | report only (% survival) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | minimum | report only (% survival) | Jan, Apr, Jul, Oct |
| NOAEL Static 48Hr Acute Pimephales promelas | minimum | report only (% survival) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
Cited limits by parameter: Connecticut's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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