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Sewage treatment plant, major discharger, Groton, Connecticut. NPDES permit CT0100242 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 20 times (last September 2026), 4 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Solids, total suspended, daily maximum | 114 mg/L | ≤ 50 mg/L | 128% |
| January 2026 | Solids, total suspended, daily maximum | 53 mg/L | ≤ 50 mg/L | 6% |
| February 2026 | Solids, total suspended, daily maximum | 78 mg/L | ≤ 50 mg/L | 56% |
| March 2026 | Enterococci, maximum | 770.1 #/100mL | ≤ 500 #/100mL | 54% |
| March 2026 | Solids, suspended percent removal, minimum | 59 % | ≥ 85 % | 173% |
| March 2026 | Solids, total suspended, daily maximum | 178 mg/L | ≤ 50 mg/L | 256% |
| March 2026 | Solids, total suspended, monthly average | 59 mg/L | ≤ 30 mg/L | 97% |
| April 2026 | BOD, 5-day, 20 deg. C, daily maximum | 110 mg/L | ≤ 50 mg/L | 120% |
| April 2026 | Enterococci, maximum | 686 #/100mL | ≤ 500 #/100mL | 37% |
| April 2026 | Solids, total suspended, daily maximum | 111 mg/L | ≤ 50 mg/L | 122% |
| April 2026 | Solids, total suspended, monthly average | 33 mg/L | ≤ 30 mg/L | 10% |
| May 2026 | Coliform, fecal - % samples exceeding limit, instantaneous maximum | 12 % | ≤ 10 % | 20% |
| May 2026 | Enterococci, maximum | 2419 #/100mL | ≤ 500 #/100mL | 384% |
| May 2026 | Solids, suspended percent removal, minimum | 80 % | ≥ 85 % | 33% |
| May 2026 | Solids, total suspended, daily maximum | 257 mg/L | ≤ 50 mg/L | 414% |
| May 2026 | Solids, total suspended, monthly average | 35 mg/L | ≤ 30 mg/L | 17% |
| June 2026 | Solids, total suspended, daily maximum | 131 mg/L | ≤ 50 mg/L | 162% |
| September 2026 | Chlorine, total residual, instantaneous maximum | 1.6 mg/L | ≤ 1.5 mg/L | 7% |
| September 2026 | Solids, total suspended, daily maximum | 431 mg/L | ≤ 50 mg/L | 762% |
| September 2026 | Solids, total suspended, monthly average | 31 mg/L | ≤ 30 mg/L | 3% |
| 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) | Mar, Jun, Sep, 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) | Mar, Jun, Sep, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Coliform, fecal - % samples exceeding limit | instantaneous maximum | ≤ 10 % | all year |
| Polychlorinated biphenyls [PCBs] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Phenols | daily maximum | report only (mg/L) | Mar, Jun, Sep, 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) | Mar, Jun, Sep, 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) | Feb, Apr, Jun, Aug, Oct, Dec |
| Beryllium, sludge, tot. dry wt [as Be] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Solids, total, percent | instantaneous minimum | report only (%) | Feb, Apr, Jun, Aug, Oct, Dec |
| Solids, fixed, % of total solids | instantaneous minimum | report only (%) | Feb, Apr, Jun, Aug, Oct, Dec |
| Solids, volatile % of total solids | instantaneous minimum | report only (%) | Feb, Apr, Jun, Aug, Oct, Dec |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Coliform, fecal general | 30-day geometric mean | ≤ 88 #/100mL | all year |
| Coliform, fecal general | maximum | report only (#/100mL) | all year |
| Zinc, sludge, total, dry weight [as Zn] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Lead, sludge, total, dry weight [as Pb] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Nickel, sludge, total, dry weight [as Ni] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Mercury, sludge, total, dry weight [as Hg] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Chromium, sludge, total, dry weight [as Cr] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Copper, sludge, total, dry weight [as Cu] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| Cadmium, sludge, total, dry weight [as Cd] | instantaneous maximum | report only (mg/kg) | Feb, Apr, Jun, Aug, Oct, Dec |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| NOAEL Static 48Hr Acute D. pulex | minimum | report only (% survival) | Mar, Jun, Sep, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | minimum | report only (% survival) | Mar, Jun, Sep, Dec |
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/CT0100242 · MCP: https://passage-data.com/mcp