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Paper Mills, major discharger, Windsor Locks, Connecticut. NPDES permit CT0000434, in force until Jan 31, 2029. Last 12 months: over a limit once (last December 2025), 9 of 91 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | LC50 Static 48Hr Acute Pimephales promelas, instantaneous minimum | 36.8 % | ≥ 42 % | 12% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | ≤ 110 deg F | Apr, May, Jun, Jul, Sep, Oct, Nov | 008 |
| Temperature, water deg. fahrenheit | instantaneous maximum | ≤ 95 deg F | Jan, Feb, Mar, Dec | 008 |
| Temperature, water deg. fahrenheit | instantaneous maximum | ≤ 115 deg F | Aug | 008 |
| Flow rate | monthly average | ≤ 6 MGD | all year | 008 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5 mg/L | all year | 008 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 008 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 008 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 008 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 008 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 008 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 008 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 008 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 008 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 008 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 008 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 008 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 008 |
| Manganese, total [as Mn] | instantaneous maximum | report only (mg/L) | Jun, Dec | 008 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 008 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 008 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 008 |
| Surfactants [MBAS] | monthly average | report only (mg/L) | all year | 008 |
| Surfactants [MBAS] | daily maximum | report only (mg/L) | all year | 008 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 9 MGD | all year | 008 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 008 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 008 |
| pH, maximum | instantaneous maximum | ≤ 9 SU | all year | 008 |
| pH, minimum | instantaneous minimum | ≥ 6 SU | all year | 008 |
| Bromine, reported as the element | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 008 |
| Flow | daily maximum | ≤ 9 MGD | all year | 008 |
| Epichlorohydrin | daily maximum | report only (mg/L) | all year | 008 |
| LC50 Static 48Hr Acute D. Pulex | instantaneous minimum | report only (%) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov | 008 |
| LC50 Static 48Hr Acute D. Pulex | instantaneous minimum | ≥ 42 % | Mar, Jun, Sep, Dec | 008 |
| LC50 Static 48Hr Acute Pimephales promelas | instantaneous minimum | report only (%) | Jan, Feb, Apr, May, Jul, Aug, Oct, Nov | 008 |
| LC50 Static 48Hr Acute Pimephales promelas | instantaneous minimum | ≥ 42 % | Mar, Jun, Sep, Dec | 008 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jun, Dec | 008 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov | 008 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jun, Dec | 008 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov | 008 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jun, Dec | 008 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov | 008 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jun, Dec | 008 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov | 008 |
| pH | instantaneous minimum | report only (SU) | Jun | 013 |
| pH | instantaneous maximum | report only (SU) | Jun | 013 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Jun | 013 |
| Flow | daily maximum | report only (gal/d) | Jun | 013 |
| pH | instantaneous minimum | report only (SU) | Jun | 014 |
| pH | instantaneous maximum | report only (SU) | Jun | 014 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Jun | 014 |
| Flow | daily maximum | report only (gal/d) | Jun | 014 |
| pH | instantaneous minimum | report only (SU) | Jun | 015 |
| pH | instantaneous maximum | report only (SU) | Jun | 015 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Jun | 015 |
| Flow | daily maximum | report only (gal/d) | Jun | 015 |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 08A |
| Flow rate | daily maximum | report only (gal/d) | all year | 08A |
| Flow rate | monthly average | ≤ 1.472 MGD | all year | 08A |
| pH | instantaneous minimum | report only (SU) | all year | 08A |
| pH | instantaneous maximum | report only (SU) | all year | 08A |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 08A |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jun, Dec | 08A |
| Flow, maximum during 24 hr period | daily maximum | report only (gal/d) | all year | 08A |
| Flow, maximum during 24 hr period | daily maximum | ≤ 3.509 MGD | all year | 08A |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 08A |
| Flow | daily maximum | report only (gal/d) | all year | 08A |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 08B |
| Flow rate | monthly average | report only (gal/d) | all year | 08B |
| pH | instantaneous minimum | report only (SU) | all year | 08B |
| pH | instantaneous maximum | report only (SU) | all year | 08B |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 08B |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jun, Dec | 08B |
| Flow, maximum during 24 hr period | daily maximum | report only (gal/d) | all year | 08B |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 08B |
| Flow | daily maximum | report only (gal/d) | all year | 08B |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 08C |
| Flow rate | monthly average | report only (gal/d) | all year | 08C |
| pH | instantaneous minimum | report only (SU) | all year | 08C |
| pH | instantaneous maximum | report only (SU) | all year | 08C |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 08C |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jun, Dec | 08C |
| Flow, maximum during 24 hr period | daily maximum | report only (gal/d) | all year | 08C |
| Flow | daily maximum | report only (gal/d) | all year | 08C |
| NOAEL Static 48Hr Acute D. pulex | instantaneous minimum | ≥ 90 % | all year | 08C |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous minimum | ≥ 90 % | all year | 08C |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 08D |
| Flow rate | monthly average | report only (gal/d) | all year | 08D |
| pH | instantaneous minimum | report only (SU) | all year | 08D |
| pH | instantaneous maximum | report only (SU) | all year | 08D |
| Solids, total suspended | daily maximum | report only (mg/L) | Jun, Dec | 08D |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jun, Dec | 08D |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jun, Dec | 08D |
| Flow, maximum during 24 hr period | daily maximum | report only (gal/d) | all year | 08D |
| Flow | daily maximum | report only (gal/d) | all year | 08D |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 08E |
| Flow rate | daily maximum | report only (gal/d) | all year | 08E |
| pH | instantaneous minimum | report only (SU) | all year | 08E |
| pH | instantaneous maximum | report only (SU) | all year | 08E |
| Solids, total suspended | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 08E |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 08E |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jun, Dec | 08E |
| Flow, maximum during 24 hr period | daily maximum | report only (gal/d) | all year | 08E |
| Flow | daily maximum | report only (gal/d) | all year | 08E |
| Flow rate | monthly average | ≤ 4.5258 MGD | all year | 08F |
| Solids, total suspended | monthly average | ≤ 28 mg/L | all year | 08F |
| Solids, total suspended | daily maximum | ≤ 60.9 mg/L | all year | 08F |
| Solids, total suspended | monthly average | ≤ 429.8 kg/d | all year | 08F |
| Solids, total suspended | daily maximum | ≤ 933.7 kg/d | all year | 08F |
| Oil & Grease | monthly average | ≤ 2 mg/L | all year | 08F |
| Oil & Grease | daily maximum | ≤ 3.3 mg/L | all year | 08F |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 08F |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 08F |
| Pentachlorophenol | daily maximum | ≤ .008 mg/L | all year | 08F |
| Flow, maximum during 24 hr period | daily maximum | ≤ 5.76 MGD | all year | 08F |
| Chlorine, total residual | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 08F |
| pH, maximum | instantaneous maximum | ≤ 9 SU | all year | 08F |
| pH, minimum | instantaneous minimum | ≥ 5 SU | all year | 08F |
| Flow | daily maximum | ≤ 5.76 MGD | all year | 08F |
| Epichlorohydrin | daily maximum | report only (mg/L) | all year | 08F |
| Trichlorophenol | daily maximum | ≤ .006 mg/L | all year | 08F |
Cited limits by parameter: Connecticut's rules and the federal ones.
Same industry: the 4 Paper and Allied Products permits in Connecticut.
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On EPA ECHO: Facility report · DMR history
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