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Sewage treatment plant, Salisbury, Connecticut. NPDES permit CT0100498 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 4 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Nitrogen, ammonia total [as N], daily maximum | 6.7 mg/L | ≤ 6 mg/L | 12% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 3.65 mg/L | ≤ 3 mg/L | 22% |
| September 2026 | Nitrogen, ammonia total [as N], daily maximum | 16 mg/L | ≤ 6 mg/L | 167% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | 4.44 mg/L | ≤ 3 mg/L | 48% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 40 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) | Mar, Jun, Sep, Dec |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Phosphorus, total [as P] | monthly average | ≤ .96 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 | ≤ 1.93 mg/L | Apr–Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Copper, total [as Cu] | monthly average | ≤ .054 kg/d | all year |
| Copper, total [as Cu] | daily maximum | ≤ .091 kg/d | all year |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Zinc, total [as Zn] | monthly average | ≤ .117 kg/d | all year |
| Zinc, total [as Zn] | daily maximum | ≤ .195 kg/d | all year |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Polychlorinated biphenyls [PCBs] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Phenols | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Chlorine, total residual | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | May–Sep |
| E. coli | maximum | ≤ 410 #/100mL | May–Sep |
| Phosphorus, Total [Avg Seasonal Load Cap] | monthly average | ≤ 1.97 lb/d | Oct |
| Arsenic, sludge tot. dry wt [as As] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Beryllium, sludge, tot. dry wt [as Be] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Solids, total, percent | instantaneous minimum | report only (%) | Jun, Dec |
| Solids, fixed, % of total solids | instantaneous minimum | report only (%) | Jun, Dec |
| Solids, volatile % of total solids | instantaneous minimum | report only (%) | Jun, Dec |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec |
| Zinc, sludge, total, dry weight [as Zn] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Lead, sludge, total, dry weight [as Pb] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Nickel, sludge, total, dry weight [as Ni] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Mercury, sludge, total, dry weight [as Hg] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Chromium, sludge, total, dry weight [as Cr] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Copper, sludge, total, dry weight [as Cu] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Cadmium, sludge, total, dry weight [as Cd] | instantaneous maximum | report only (mg/kg) | Jun, Dec |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | monthly average | report only (mg/L) | all year |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | 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 % | Mar, Jun, Sep, Dec |
| NOAEL Static 48Hr Acute Pimephales promelas | instantaneous minimum | ≥ 90 % | Mar, Jun, Sep, 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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