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Sewage treatment plant, major discharger, Plainville, Connecticut. NPDES permit CT0100455 expired Jun 30, 2026; its limits still apply. Last 12 months: over a limit 3 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Phosphorus, total [as P], daily maximum | 3.44 mg/L | ≤ .62 mg/L | 455% |
| October 2025 | Phosphorus, total [as P], monthly average | 1.23 mg/L | ≤ .31 mg/L | 297% |
| August 2026 | Ultraviolet light intensity, instantaneous minimum | 0 uW/cm2 | ≥ 6.1 uW/cm2 | 100% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Oxygen demand, ultimate | monthly average | ≤ 19.7 mg/L | Jun–Oct |
| Oxygen demand, ultimate | monthly average | ≤ 59.3 mg/L | May, Nov |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 7 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 35 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 | ≤ 20 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 35 mg/L | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8 mg/L | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 mg/L | Apr |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 mg/L | Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 17 mg/L | Jan–Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 49 mg/L | Jan–Mar |
| Nitrogen, ammonia total [as N] | 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, nitrite 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, nitrate 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 |
| Phosphorus, total [as P] | monthly average | ≤ .31 mg/L | Apr–Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | ≤ .62 mg/L | Apr–Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, 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) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| 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] | daily 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) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| 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) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Copper, total [as Cu] | daily maximum | report only (mL/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Iron, total [as Fe] | 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 |
| 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) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| 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) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| 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) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| 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 |
| Ultraviolet light intensity | instantaneous minimum | ≥ 6.1 uW/cm2 | 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 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct |
| E. coli | maximum | ≤ 410 #/100mL | Apr–Oct |
| Phosphorus, Total [Avg Seasonal Load Cap] | monthly average | ≤ 3.49 lb/d | Apr–Oct |
| 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 |
| 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, carbonaceous [5 day, 5 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 5 C] | daily maximum | report only (mg/L) | all year |
| 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 | instantaneous minimum | ≥ 90 % survival | Jan, Apr, Jul, Oct |
| NOAEL Static 48Hr Acute D. pulex | instantaneous minimum | report only (% survival) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous minimum | ≥ 90 % survival | Jan, Apr, Jul, Oct |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous 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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