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Sewage treatment plant, major discharger, Charlestown, New Hampshire. NPDES permit NH0100765 expired Sep 30, 2025; its limits still apply. Last 12 months: no values over a limit, 20 required values missing, 3 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Apr–Jun |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 50 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 275 lb/d | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 459 lb/d | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 413 lb/d | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8 SU | all year |
| pH | daily maximum | report only (SU) | Apr–Jun |
| 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 | ≤ 275 lb/d | all year |
| Solids, total suspended | daily maximum | ≤ 459 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 413 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr–Jun |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr–Jun |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | Apr–Jun |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | Apr–Jun |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/L) | Apr–Jun |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Jun |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Apr–Jun |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Apr–Jun |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Apr–Jun |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Apr–Jun |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Apr–Jun |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Apr–Jun |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Apr–Jun |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Apr–Jun |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Apr–Jun |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Apr–Jun |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Apr–Jun |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Apr–Jun |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Apr–Jun |
| E. coli, thermotol, MF, MTEC | monthly geometric mean | ≤ 126 #/100mL | all year |
| E. coli, thermotol, MF, MTEC | daily maximum | ≤ 406 #/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 | ≤ 1.1 MGD | all year |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ 1 mg/L | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | monthly average minimum | ≥ 50 % | Apr–Jun |
| LC50 Static 48Hr Acute Pimephales promelas | monthly average minimum | ≥ 50 % | Apr–Jun |
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/NH0100765 · MCP: https://passage-data.com/mcp