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Electric Services, major discharger, Middletown, Connecticut. NPDES permit CT0003883 expired Mar 18, 2006; its limits still apply. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Iron, total [as Fe], daily maximum | 1.08 mg/L | ≤ 1 mg/L | 8% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | ≤ 126 deg F | all year | 001 |
| Flow rate | monthly average | report only (gal/d) | all year | 001 |
| Flow rate | daily maximum | report only (gal/min) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 001 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 62591000 gal/d | all year | 001 |
| Flow | monthly average | report only (gal/d) | all year | 001 |
| Flow | daily maximum | ≤ 62591000 gal/d | all year | 001 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | average | report only (pass=0;fail=1) | Jan, Jul | 001 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | average | report only (pass=0;fail=1) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | average | report only (pass=0;fail=1) | Jan, Jul | 001 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | average | report only (pass=0;fail=1) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | instantaneous maximum | ≤ 128 deg F | all year | 002 |
| Flow rate | monthly average | report only (gal/d) | all year | 002 |
| Flow rate | daily maximum | report only (gal/min) | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 002 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 82900000 gal/d | all year | 002 |
| Flow | monthly average | report only (gal/d) | all year | 002 |
| Flow | daily maximum | ≤ 82900000 gal/d | all year | 002 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | average | report only (pass=0;fail=1) | Jan, Jul | 002 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | average | report only (pass=0;fail=1) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 002 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | average | report only (pass=0;fail=1) | Jan, Jul | 002 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | average | report only (pass=0;fail=1) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 002 |
| Temperature, water deg. fahrenheit | instantaneous maximum | ≤ 129 deg F | all year | 003 |
| Flow rate | monthly average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (gal/min) | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 003 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 146.9 MGD | all year | 003 |
| Flow | monthly average | report only (MGD) | all year | 003 |
| Flow | daily maximum | ≤ 146.9 MGD | all year | 003 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | average | report only (pass=0;fail=1) | Jan, Jul | 003 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | average | report only (pass=0;fail=1) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | average | report only (pass=0;fail=1) | Jan, Jul | 003 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | average | report only (pass=0;fail=1) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 005 |
| Flow rate | monthly average | ≤ 525000 gal/d | all year | 005 |
| Flow rate | monthly average | ≤ 813000 gal/d | all year | 005 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 005 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 005 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 005 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 005 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Arsenic, total [as As] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Copper, total [as Cu] | monthly average | ≤ .096 mg/L | all year | 005 |
| Copper, total [as Cu] | daily maximum | ≤ .192 mg/L | all year | 005 |
| Iron, total [as Fe] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Lead, total [as Pb] | monthly average | ≤ .02 mg/L | all year | 005 |
| Lead, total [as Pb] | daily maximum | ≤ .04 mg/L | all year | 005 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Zinc, total [as Zn] | monthly average | ≤ .631 mg/L | all year | 005 |
| Zinc, total [as Zn] | daily maximum | ≤ 1.27 mg/L | all year | 005 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 005 |
| Surfactants [MBAS] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Surfactants [MBAS] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Flow, maximum during 24 hr period | daily maximum | report only (gal/d) | all year | 005 |
| Hydrazine | instantaneous maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 005 |
| Pass/Fail Static 48Hr Acute D. Pulex | average | report only (pass=0;fail=1) | Jan, Apr, Jul, Oct | 005 |
| Pass/Fail Static 48Hr Acute D. Pulex | average | report only (pass=0;fail=1) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 005 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | average | report only (pass=0;fail=1) | Jan, Apr, Jul, Oct | 005 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | average | report only (pass=0;fail=1) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 005 |
| Flow rate | monthly average | ≤ 100000 gal/d | all year | 018 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 018 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 018 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 018 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 018 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 720000 gal/d | all year | 018 |
| Flow rate | monthly average | ≤ 1000000 gal/d | all year | 019 |
| Flow rate | daily maximum | report only (gal/min) | all year | 019 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 019 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 019 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 019 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 019 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 019 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 019 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 23.4 mg/L | all year | 019 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47 mg/L | all year | 019 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | all year | 019 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 019 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 019 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 019 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 019 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 019 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Arsenic, total [as As] | monthly average | ≤ 18.9 g/d | all year | 019 |
| Arsenic, total [as As] | daily maximum | ≤ 37.8 g/d | all year | 019 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Cadmium, total [as Cd] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Copper, total [as Cu] | monthly average | ≤ 1 mg/L | all year | 019 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 019 |
| Copper, total [as Cu] | monthly average | ≤ 362 g/d | all year | 019 |
| Copper, total [as Cu] | daily maximum | ≤ 727 g/d | all year | 019 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Iron, total [as Fe] | monthly average | ≤ 1 mg/L | all year | 019 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 019 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Lead, total [as Pb] | monthly average | ≤ .1 mg/L | all year | 019 |
| Lead, total [as Pb] | daily maximum | ≤ .5 mg/L | all year | 019 |
| Lead, total [as Pb] | monthly average | ≤ 74.1 g/d | all year | 019 |
| Lead, total [as Pb] | daily maximum | ≤ 149 g/d | all year | 019 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 019 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 019 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Vanadium, total [as V] | monthly average | report only (mg/L) | all year | 019 |
| Vanadium, total [as V] | daily maximum | report only (mg/L) | all year | 019 |
| Vanadium, total [as V] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Vanadium, total [as V] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Zinc, total [as Zn] | monthly average | ≤ 1 mg/L | all year | 019 |
| Zinc, total [as Zn] | daily maximum | ≤ 2 mg/L | all year | 019 |
| Zinc, total [as Zn] | monthly average | ≤ 2392 g/d | all year | 019 |
| Zinc, total [as Zn] | daily maximum | ≤ 4809 g/d | all year | 019 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Aluminum, total [as Al] | monthly average | ≤ 2 mg/L | all year | 019 |
| Aluminum, total [as Al] | daily maximum | ≤ 4 mg/L | all year | 019 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 ug/L | all year | 019 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 1584000 gal/d | all year | 019 |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Chlorine, total residual | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Mercury, total [as Hg] | monthly average | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Flow | monthly average | ≤ 1000000 gal/d | all year | 019 |
| Flow | daily maximum | ≤ 1584000 gal/d | all year | 019 |
| Hydrazine | instantaneous maximum | report only (mg/L) | all year | 019 |
| Hydrazine | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 019 |
| Hydrazine | daily maximum | report only (mg/L) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Pass/Fail Static 48Hr Acute D. Pulex | average | report only (pass=0;fail=1) | Jan, Apr, Jul, Oct | 019 |
| Pass/Fail Static 48Hr Acute D. Pulex | average | report only (pass=0;fail=1) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | average | report only (pass=0;fail=1) | Jan, Apr, Jul, Oct | 019 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | average | report only (pass=0;fail=1) | Feb, Mar, May, Jun, Aug, Sep, Nov, Dec | 019 |
| pH | instantaneous minimum | ≥ 6 SU | Jan, Jul | 020 |
| pH | instantaneous maximum | ≤ 9 SU | Jan, Jul | 020 |
| Oil & Grease | instantaneous maximum | ≤ 10 mg/L | Jan, Jul | 020 |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 023 |
| Flow rate | monthly average | ≤ 1000000 gal/d | all year | 023 |
| Flow rate | daily maximum | report only (gal/min) | all year | 023 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 023 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 023 |
| Copper, total [as Cu] | monthly average | ≤ 1 mg/L | all year | 023 |
| Copper, total [as Cu] | daily maximum | ≤ 2 mg/L | all year | 023 |
| Zinc, total [as Zn] | monthly average | ≤ 1 mg/L | all year | 023 |
| Zinc, total [as Zn] | daily maximum | ≤ 2 mg/L | all year | 023 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 023 |
| Flow, maximum during 24 hr period | daily maximum | ≤ 1152000 gal/d | all year | 023 |
| Flow | monthly average | ≤ 1000000 gal/d | all year | 023 |
| Flow | daily maximum | ≤ 1152000 gal/d | all year | 023 |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 123 |
| Flow rate | monthly average | report only (MGD) | all year | 123 |
| Flow, maximum during 24 hr period | daily maximum | report only (MGD) | all year | 123 |
Cited limits by parameter: Connecticut's rules and the federal ones.
Same industry: the 12 Electric Services permits in Connecticut.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CT0003883 · MCP: https://passage-data.com/mcp