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Sewage treatment plant, Somers, Connecticut. NPDES permit CT0101605 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 41 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Solids, total suspended, daily maximum | 40 mg/L | ≤ 30 mg/L | 33% |
| October 2025 | Solids, total suspended, monthly average | 31 mg/L | ≤ 20 mg/L | 55% |
| November 2025 | BOD, 5-day, 20 deg. C, daily maximum | 34 mg/L | ≤ 30 mg/L | 13% |
| November 2025 | BOD, 5-day, 20 deg. C, monthly average | 33.5 mg/L | ≤ 20 mg/L | 68% |
| November 2025 | BOD, 5-day, percent removal, minimum % removal | 83 % | ≥ 90 % | 70% |
| November 2025 | Solids, suspended percent removal, minimum % removal | 85 % | ≥ 90 % | 50% |
| November 2025 | Solids, total suspended, daily maximum | 37 mg/L | ≤ 30 mg/L | 23% |
| November 2025 | Solids, total suspended, monthly average | 33 mg/L | ≤ 20 mg/L | 65% |
| December 2025 | BOD, 5-day, 20 deg. C, daily maximum | 80 mg/L | ≤ 30 mg/L | 167% |
| December 2025 | BOD, 5-day, 20 deg. C, monthly average | 57 mg/L | ≤ 20 mg/L | 185% |
| December 2025 | BOD, 5-day, percent removal, minimum % removal | 81 % | ≥ 90 % | 90% |
| December 2025 | NOAEL Static 48Hr Acute Pimephales promelas, daily minimum | 0 % survival | ≥ 90 % survival | 100% |
| December 2025 | Solids, suspended percent removal, minimum % removal | 86 % | ≥ 90 % | 40% |
| December 2025 | Solids, total suspended, daily maximum | 39 mg/L | ≤ 30 mg/L | 30% |
| December 2025 | Solids, total suspended, monthly average | 35 mg/L | ≤ 20 mg/L | 75% |
| January 2026 | BOD, 5-day, 20 deg. C, daily maximum | 98 mg/L | ≤ 30 mg/L | 227% |
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 97 mg/L | ≤ 20 mg/L | 385% |
| January 2026 | BOD, 5-day, percent removal, minimum % removal | 73 % | ≥ 90 % | 170% |
| January 2026 | Solids, suspended percent removal, minimum % removal | 84 % | ≥ 90 % | 60% |
| January 2026 | Solids, total suspended, daily maximum | 41 mg/L | ≤ 30 mg/L | 37% |
| January 2026 | Solids, total suspended, monthly average | 39 mg/L | ≤ 20 mg/L | 95% |
| February 2026 | BOD, 5-day, 20 deg. C, daily maximum | 66 mg/L | ≤ 30 mg/L | 120% |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 54 mg/L | ≤ 20 mg/L | 170% |
| February 2026 | BOD, 5-day, percent removal, minimum % removal | 83 % | ≥ 90 % | 70% |
| February 2026 | Solids, suspended percent removal, minimum % removal | 79 % | ≥ 90 % | 110% |
| February 2026 | Solids, total suspended, daily maximum | 44 mg/L | ≤ 30 mg/L | 47% |
| February 2026 | Solids, total suspended, monthly average | 35 mg/L | ≤ 20 mg/L | 75% |
| March 2026 | BOD, 5-day, percent removal, minimum % removal | 84 % | ≥ 90 % | 60% |
| March 2026 | Solids, suspended percent removal, minimum % removal | 67 % | ≥ 90 % | 230% |
| April 2026 | Solids, suspended percent removal, minimum % removal | 85 % | ≥ 90 % | 50% |
| April 2026 | Solids, total suspended, monthly average | 25 mg/L | ≤ 20 mg/L | 25% |
| May 2026 | E. coli, 30-day geometric mean | 985.92 #/100mL | ≤ 126 #/100mL | 682% |
| May 2026 | E. coli, maximum | 1990 #/100mL | ≤ 410 #/100mL | 385% |
| June 2026 | E. coli, 30-day geometric mean | 665.48 #/100mL | ≤ 126 #/100mL | 428% |
| June 2026 | E. coli, maximum | 2420 #/100mL | ≤ 410 #/100mL | 490% |
| June 2026 | NOAEL Static 48Hr Acute Pimephales promelas, daily minimum | 44 % survival | ≥ 90 % survival | 51% |
| June 2026 | Solids, suspended percent removal, minimum % removal | 84 % | ≥ 90 % | 60% |
| June 2026 | Solids, total suspended, daily maximum | 33 mg/L | ≤ 30 mg/L | 10% |
| June 2026 | Solids, total suspended, monthly average | 28.5 mg/L | ≤ 20 mg/L | 43% |
| July 2026 | E. coli, 30-day geometric mean | 792.7 #/100mL | ≤ 126 #/100mL | 529% |
| July 2026 | E. coli, maximum | 816 #/100mL | ≤ 410 #/100mL | 99% |
| 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 | ≤ 20 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 30 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) | Jun, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | Jun, Dec |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jun, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jun, Dec |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jun, Dec |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jun, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Jun, Dec |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Jun, Dec |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Jun, Dec |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Jun, Dec |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jun, Dec |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Jun, Dec |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jun, Dec |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jun, Dec |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jun, Dec |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jun, Dec |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Jun, Dec |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jun, Dec |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Jun, Dec |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jun, Dec |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Jun, Dec |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jun, Dec |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Jun, Dec |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Polychlorinated biphenyls [PCBs] | instantaneous maximum | report only (mg/kg) | Jun |
| Phenols | daily maximum | report only (mg/L) | Jun, Dec |
| Phenols | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Chlorine, total residual | monthly average | ≤ .05 mg/L | May–Sep |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | May–Sep |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jun, Dec |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | May–Sep |
| E. coli | maximum | ≤ 410 #/100mL | May–Sep |
| Arsenic, sludge tot. dry wt [as As] | instantaneous maximum | report only (mg/kg) | Jun |
| Beryllium, sludge, tot. dry wt [as Be] | instantaneous maximum | report only (mg/kg) | Jun |
| Ultraviolet light dosage | minimum | report only (mW-sec/cm2) | May–Sep |
| Solids, total, percent | instantaneous minimum | report only (%) | Jun |
| Solids, fixed, % of total solids | instantaneous minimum | report only (%) | Jun |
| Solids, volatile % of total solids | instantaneous minimum | report only (%) | Jun |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Jun, Dec |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| Zinc, sludge, total, dry weight [as Zn] | instantaneous maximum | report only (mg/kg) | Jun |
| Lead, sludge, total, dry weight [as Pb] | instantaneous maximum | report only (mg/kg) | Jun |
| Nickel, sludge, total, dry weight [as Ni] | instantaneous maximum | report only (mg/kg) | Jun |
| Mercury, sludge, total, dry weight [as Hg] | instantaneous maximum | report only (mg/kg) | Jun |
| Chromium, sludge, total, dry weight [as Cr] | instantaneous maximum | report only (mg/kg) | Jun |
| Copper, sludge, total, dry weight [as Cu] | instantaneous maximum | report only (mg/kg) | Jun |
| Cadmium, sludge, total, dry weight [as Cd] | instantaneous maximum | report only (mg/kg) | Jun |
| BOD, 5-day, percent removal | minimum % removal | ≥ 90 % | all year |
| Solids, suspended percent removal | minimum % removal | ≥ 90 % | all year |
| NOAEL Static 48Hr Acute D. pulex | daily minimum | ≥ 90 % survival | Jun, Dec |
| NOAEL Static 48Hr Acute D. pulex | daily minimum | report only (% survival) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
| NOAEL Static 48Hr Acute Pimephales promelas | daily minimum | ≥ 90 % survival | Jun, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | daily minimum | report only (% survival) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov |
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/CT0101605 · MCP: https://passage-data.com/mcp