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Sewage treatment plant, major discharger, Uncasville, Connecticut. NPDES permit CT0100935 expired Oct 31, 2024; its limits still apply. Last 12 months: over a limit 28 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Enterococci, 30-day geometric mean | 40 #/100mL | ≤ 35 #/100mL | 14% |
| December 2025 | BOD, 5-day, 20 deg. C, daily maximum | 84 mg/L | ≤ 45 mg/L | 87% |
| December 2025 | BOD, 5-day, 20 deg. C, monthly average | 35 mg/L | ≤ 30 mg/L | 17% |
| December 2025 | Solids, total suspended, daily maximum | 134 mg/L | ≤ 45 mg/L | 198% |
| December 2025 | Solids, total suspended, monthly average | 62 mg/L | ≤ 30 mg/L | 107% |
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 31 mg/L | ≤ 30 mg/L | 3% |
| January 2026 | Solids, suspended percent removal, minimum % removal | 65 % | ≥ 85 % | 133% |
| January 2026 | Solids, total suspended, daily maximum | 186 mg/L | ≤ 45 mg/L | 313% |
| January 2026 | Solids, total suspended, monthly average | 135 mg/L | ≤ 30 mg/L | 350% |
| February 2026 | BOD, 5-day, 20 deg. C, daily maximum | 100 mg/L | ≤ 45 mg/L | 122% |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 51 mg/L | ≤ 30 mg/L | 70% |
| February 2026 | Solids, suspended percent removal, minimum % removal | 60 % | ≥ 85 % | 167% |
| February 2026 | Solids, total suspended, daily maximum | 214 mg/L | ≤ 45 mg/L | 376% |
| February 2026 | Solids, total suspended, monthly average | 158 mg/L | ≤ 30 mg/L | 427% |
| March 2026 | BOD, 5-day, 20 deg. C, daily maximum | 53 mg/L | ≤ 45 mg/L | 18% |
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 32 mg/L | ≤ 30 mg/L | 7% |
| March 2026 | Solids, suspended percent removal, minimum % removal | 81 % | ≥ 85 % | 27% |
| March 2026 | Solids, total suspended, daily maximum | 86 mg/L | ≤ 45 mg/L | 91% |
| March 2026 | Solids, total suspended, monthly average | 61 mg/L | ≤ 30 mg/L | 103% |
| April 2026 | BOD, 5-day, 20 deg. C, daily maximum | 91 mg/L | ≤ 45 mg/L | 102% |
| April 2026 | BOD, 5-day, 20 deg. C, monthly average | 48 mg/L | ≤ 30 mg/L | 60% |
| April 2026 | Solids, suspended percent removal, minimum % removal | 79 % | ≥ 85 % | 40% |
| April 2026 | Solids, total suspended, daily maximum | 138 mg/L | ≤ 45 mg/L | 207% |
| April 2026 | Solids, total suspended, monthly average | 86 mg/L | ≤ 30 mg/L | 187% |
| May 2026 | Enterococci, 30-day geometric mean | 50 #/100mL | ≤ 35 #/100mL | 43% |
| May 2026 | Solids, total suspended, daily maximum | 46 mg/L | ≤ 45 mg/L | 2% |
| June 2026 | Solids, total suspended, daily maximum | 67 mg/L | ≤ 45 mg/L | 49% |
| June 2026 | Solids, total suspended, monthly average | 37 mg/L | ≤ 30 mg/L | 23% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30000 lb/d | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 38500 lb/d | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| 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 | ≤ 45 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 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| 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 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| 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 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Coliform, fecal - % samples exceeding limit | instantaneous maximum | ≤ 10 % | May–Oct |
| Polychlorinated biphenyls [PCBs] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Phenols | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chlorine, total residual | instantaneous minimum | ≥ .2 mg/L | May–Oct |
| Chlorine, total residual | instantaneous maximum | ≤ 1.5 mg/L | May–Oct |
| Chlorine, total residual | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Enterococci | 30-day geometric mean | ≤ 35 #/100mL | May–Oct |
| Enterococci | maximum | ≤ 500 #/100mL | May–Oct |
| Arsenic, sludge tot. dry wt [as As] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Beryllium, sludge, tot. dry wt [as Be] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Solids, total, percent | instantaneous minimum | report only (%) | Mar, Jun, Sep, Dec |
| Solids, fixed, % of total solids | instantaneous minimum | report only (%) | Mar, Jun, Sep, Dec |
| Solids, volatile % of total solids | instantaneous minimum | report only (%) | Mar, Jun, Sep, Dec |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| Coliform, fecal general | 30-day geometric mean | ≤ 88 #/100mL | May–Oct |
| Zinc, sludge, total, dry weight [as Zn] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Lead, sludge, total, dry weight [as Pb] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Nickel, sludge, total, dry weight [as Ni] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Mercury, sludge, total, dry weight [as Hg] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Chromium, sludge, total, dry weight [as Cr] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Copper, sludge, total, dry weight [as Cu] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| Cadmium, sludge, total, dry weight [as Cd] | instantaneous maximum | report only (mg/kg) | Mar, Jun, Sep, Dec |
| 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) | Mar, Jun, Sep, Dec |
| NOAEL Static 48Hr Acute D. pulex | minimum | report only (% survival) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
| NOAEL Static 48Hr Acute Pimephales promelas | minimum | report only (% survival) | Mar, Jun, Sep, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | minimum | report only (% survival) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov |
Cited limits by parameter: Connecticut's rules and the federal ones.
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