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Aircraft Engines And Engine Parts, Middletown, Town Of, Connecticut. NPDES permit CT0001406, in force until Dec 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | Jan, Apr, Jul, Oct |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Flow rate | monthly average | report only (gal/d) | all year |
| pH | instantaneous minimum | report only (SU) | Jan, Apr, Jul, Oct |
| pH | instantaneous maximum | report only (SU) | Jan, Apr, Jul, Oct |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Oil & Grease | instantaneous maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Oil & Grease | instantaneous maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul, Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul, Oct |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jul, Oct |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jul, Oct |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | May–Oct |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Copper, total [as Cu] | monthly average | ≤ 1.372 kg/d | May–Oct |
| Copper, total [as Cu] | monthly average | ≤ 1.294 kg/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Copper, total [as Cu] | daily maximum | ≤ 2.069 kg/d | May–Oct |
| Copper, total [as Cu] | daily maximum | ≤ 1.942 kg/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jul, Oct |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jul, Oct |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jul, Oct |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jul, Oct |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jul, Oct |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jul, Oct |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jul, Oct |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jul, Oct |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jul, Oct |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jul, Oct |
| Flow, maximum during 24 hr period | daily maximum | ≤ 35000000 gal/d | May–Oct |
| Flow, maximum during 24 hr period | daily maximum | ≤ 30000000 gal/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Jan, Apr, Jul, Oct |
| pH, maximum | instantaneous maximum | ≤ 9 SU | all year |
| pH, minimum | instantaneous minimum | ≥ 6 SU | all year |
| Flow | daily maximum | report only (MGD) | Jan, Apr, Jul, Oct |
| NOAEL Static 48Hr Acute D. pulex | instantaneous minimum | ≥ 90 % | Jul, Oct |
| NOAEL Static 48Hr Acute D. pulex | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Nov, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous minimum | ≥ 90 % | Jul, Oct |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Nov, Dec |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jul, Oct |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Nov, Dec |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jul, Oct |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Nov, Dec |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Nov, Dec |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | instantaneous minimum | report only (%) | Jul, Oct |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Nov, Dec |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | instantaneous minimum | report only (%) | Jul, Oct |
Cited limits by parameter: Connecticut's rules and the federal ones.
Same industry: the 4 Transportation Equipment permits in Connecticut.
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