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Sewage treatment plant, major discharger, Claremont, New Hampshire. NPDES permit NH0101257 expired Sep 30, 2021; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 7 mg/L | Jun–Oct |
| Oxygen, dissolved [DO] | minimum | ≥ 7 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 973 lb/d | all year |
| Solids, total suspended | daily maximum | ≤ 1622 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 1460 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Mar–Sep |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Mar–Sep |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Mar–Sep |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Mar–Sep |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10.9 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.3 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Mar–Sep |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Mar–Sep |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (lb/d) | Mar–Sep |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Oct, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | Mar–Sep |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Oct, Nov, Dec |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Mar–Sep |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Oct, Nov, Dec |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Mar–Sep |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Oct, Nov, Dec |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | Mar–Sep |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | Jan, Feb, Oct, Nov, Dec |
| Nitrite + Nitrate total [as N] | daily maximum | report only (lb/d) | Mar–Sep |
| Nitrite + Nitrate total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Oct, Nov, Dec |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Apr–Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr–Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | monthly average | ≤ 17 lb/d | Apr–Oct |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Apr–Oct |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Nov, Dec |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jul–Dec |
| Nickel, total recoverable | daily maximum | report only (mg/L) | Jul–Dec |
| Zinc, total recoverable | daily maximum | report only (mg/L) | Jul–Dec |
| Aluminum, total recoverable | daily maximum | report only (mg/L) | Jul–Dec |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | Jul–Dec |
| Lead, total recoverable | daily maximum | report only (mg/L) | Jul–Dec |
| Copper, total recoverable | monthly average | ≤ 17.32 ug/L | all year |
| Copper, total recoverable | daily maximum | ≤ 24.64 ug/L | all year |
| Copper, total recoverable | daily maximum | report only (mg/L) | Jul–Dec |
| E. coli, thermotol, MF, MTEC | monthly geometric mean | ≤ 126 CFU/100mL | all year |
| E. coli, thermotol, MF, MTEC | daily maximum | ≤ 406 CFU/100mL | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | rolling average | ≤ 3.89 MGD | all year |
| Chlorine, total residual | monthly average | ≤ .072 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .123 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 45 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 811 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1460 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1298 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | daily minimum | ≥ 100 % | Jul–Dec |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | daily minimum | ≥ 100 % | Jul–Dec |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | daily minimum | ≥ 15.4 % | Jul–Dec |
| Noel Statre 7Day Chronic Pimephales | daily minimum | ≥ 15.4 % | Jul–Dec |
Cited limits by parameter: New Hampshire's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/NH0101257 · MCP: https://passage-data.com/mcp