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Sewage treatment plant, Hanover, New Hampshire. NPDES permit NH0100099 expired Jan 31, 2021; its limits still apply. Last 12 months: over a limit once (last September 2026), 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| September 2026 | Chlorine, total residual, daily maximum | 1.53 mg/L | ≤ 1 mg/L | 53% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | minimum | ≥ 6 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 | ≤ 575 lb/d | all year |
| Solids, total suspended | daily maximum | ≤ 958 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 863 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) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Mar–Sep |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Mar–Sep |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Mar–Sep |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jul–Sep |
| 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 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jul–Sep |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Jul–Sep |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Jul–Sep |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | Jul–Sep |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Jul–Sep |
| Lead, total recoverable | daily maximum | report only (ug/L) | Jul–Sep |
| Copper, total recoverable | daily maximum | report only (ug/L) | Jul–Sep |
| 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 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ 1 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 | ≤ 480 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 863 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 767 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 | report only (%) | all year |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | monthly average minimum | ≥ 50 % | Jul–Sep |
| LC50 Static 48Hr Acute Pimephales promelas | monthly average minimum | ≥ 50 % | Jul–Sep |
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/NH0100099 · MCP: https://passage-data.com/mcp