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Sewage treatment plant, major discharger, East Norwalk, Connecticut. NPDES permit CT0101249 expired Mar 31, 2026; its limits still apply. Last 12 months: over a limit 7 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | BOD, 5-day, 20 deg. C, daily maximum | 73.4 mg/L | ≤ 40 mg/L | 84% |
| July 2026 | Solids, total suspended, daily maximum | 127 mg/L | ≤ 40 mg/L | 218% |
| July 2026 | Solids, total suspended, monthly average | 22.5 mg/L | ≤ 20 mg/L | 13% |
| August 2026 | Enterococci, maximum | 579 #/100mL | ≤ 500 #/100mL | 16% |
| September 2026 | BOD, 5-day, 20 deg. C, daily maximum | 70 mg/L | ≤ 40 mg/L | 75% |
| September 2026 | Solids, total suspended, daily maximum | 194 mg/L | ≤ 40 mg/L | 385% |
| September 2026 | Solids, total suspended, monthly average | 28.6 mg/L | ≤ 20 mg/L | 43% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 40 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 40 mg/L | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, total [as N] | rolling average | ≤ 1105 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Coliform, fecal - % samples exceeding limit | daily maximum | ≤ 10 % | all year | 001 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Phenols | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .07 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Enterococci | 30-day geometric mean | ≤ 35 #/100mL | all year | 001 |
| Enterococci | maximum | ≤ 500 #/100mL | all year | 001 |
| Arsenic, sludge tot. dry wt [as As] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Beryllium, sludge, tot. dry wt [as Be] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Solids, total, percent | instantaneous minimum | report only (%) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Solids, fixed, % of total solids | instantaneous minimum | report only (%) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Solids, volatile % of total solids | instantaneous minimum | report only (%) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Coliform, fecal general | 30-day geometric mean | ≤ 88 #/100mL | all year | 001 |
| Zinc, sludge, total, dry weight [as Zn] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Lead, sludge, total, dry weight [as Pb] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Nickel, sludge, total, dry weight [as Ni] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Mercury, sludge, total, dry weight [as Hg] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Chromium, sludge, total, dry weight [as Cr] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Copper, sludge, total, dry weight [as Cu] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Cadmium, sludge, total, dry weight [as Cd] | daily maximum | report only (mg/kg) | Jan, Mar, May, Jul, Sep, Nov | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | monthly average | report only (mg/L) | all year | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | minimum % removal | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum % removal | ≥ 85 % | all year | 001 |
| NOAEL Static 48Hr Acute D. pulex | instantaneous minimum | ≥ 90 % survival | Mar, Jun, Sep, Dec | 001 |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous minimum | ≥ 90 % survival | Mar, Jun, Sep, Dec | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Duration | daily maximum | report only (hr/d) | all year | 002 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 002 |
| Enterococci | daily maximum | report only (#/100L) | all year | 002 |
| Coliform, fecal general | instantaneous maximum | report only (#/100L) | all year | 002 |
Cited limits by parameter: Connecticut's rules and the federal ones.
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