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Sewage treatment plant, major discharger, Norwich, New York. NPDES permit NY0021423, in force until Feb 28, 2029. Last 12 months: over a limit 3 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Phosphorus, total [as P], 12-month total | 3956 lb/yr | ≤ 3610 lb/yr | 10% |
| November 2025 | Phosphorus, total [as P], 12-month total | 3950 lb/yr | ≤ 3610 lb/yr | 9% |
| December 2025 | Phosphorus, total [as P], 12-month total | 3696 lb/yr | ≤ 3610 lb/yr | 2% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Oxygen demand, ultimate | monthly average | report only (mg/L) | May–Oct |
| Oxygen demand, ultimate | monthly average | ≤ 770 lb/d | May–Oct |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | May–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 630 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 940 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | 7-day average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | 7-day average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | daily minimum | report only (SU) | all year |
| pH | daily maximum | report only (SU) | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 30 mg/L | May–Oct |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | May–Oct |
| Solids, total suspended | monthly average | ≤ 630 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 550 lb/d | May–Oct |
| Solids, total suspended | 7-day average | ≤ 940 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 830 lb/d | May–Oct |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | 7-day average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Solids, total suspended | 7-day average | report only (lb/d) | all year |
| Solids, settleable | daily maximum | ≤ .3 mL/L | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year |
| Nitrogen, total [as N] | 12-month total | ≤ 177000 lb/yr | all year |
| Nitrogen, total [as N] | 12-month total | ≤ 214000 lb/yr | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year |
| Phosphorus, total [as P] | 12-month total | ≤ 3610 lb/yr | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 2.5 MGD | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 2.2 MGD | May–Oct |
| Chlorine, total residual | daily maximum | ≤ .5 mg/L | May–Oct |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 3.3 tox acute (alert, not enforceable) | May–Oct |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 5.7 tox acute (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 12 tox chronic (alert, not enforceable) | May–Oct |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 24 tox chronic (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 3.3 tox acute (alert, not enforceable) | May–Oct |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 5.7 tox acute (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 12 tox chronic (alert, not enforceable) | May–Oct |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 24 tox chronic (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec |
| Mercury, total [as Hg] | daily maximum | ≤ 50 ng/L | all year |
| Coliform, fecal general | 30-day geometric mean | ≤ 200 #/100mL | May–Oct |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 460 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 730 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (mg/L) | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (lb/d) | May–Oct |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | May–Oct |
Cited limits by parameter: New York's rules and the federal ones.
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