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Sewage treatment plant, major discharger, Swanzey, New Hampshire. NPDES permit NH0100790, in force until Nov 30, 2026. Last 12 months: over a limit 5 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Aluminum, total recoverable, monthly average | 165 ug/L | ≤ 109 ug/L | 51% |
| November 2025 | Aluminum, total recoverable, monthly average | 111 ug/L | ≤ 109 ug/L | 2% |
| December 2025 | Aluminum, total recoverable, monthly average | 142 ug/L | ≤ 109 ug/L | 30% |
| January 2026 | Aluminum, total recoverable, monthly average | 178 ug/L | ≤ 109 ug/L | 63% |
| January 2026 | pH, minimum | 6.3 SU | ≥ 6.5 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jul–Sep |
| Oxygen, dissolved [DO] | minimum | ≥ 7 mg/L | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8 SU | all year |
| pH | daily maximum | report only (SU) | Jul–Sep |
| 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 | ≤ 1502 lb/d | all year |
| Solids, total suspended | daily maximum | ≤ 2504 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 2253 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, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, total [as N] | rolling average | ≤ 501 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.9 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 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 | report only (mg/L) | Jul–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 105 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 496 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 155 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jul–Sep |
| 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 |
| Phosphorus, total [as P] | monthly average | ≤ .18 mg/L | Apr–Oct |
| Phosphorus, total [as P] | monthly average | ≤ 1 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] | daily maximum | report only (mg/L) | Apr–Oct |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | Jul–Sep |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | Jul–Sep |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/L) | Jul–Sep |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jul–Sep |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Jul–Sep |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jul–Sep |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | Jul–Sep |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jul–Sep |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | Jul–Sep |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jul–Sep |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | Jul–Sep |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jul–Sep |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | Jul–Sep |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jul–Sep |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | Jul–Sep |
| Zinc, total recoverable | monthly average | ≤ 77 ug/L | all year |
| Zinc, total recoverable | daily maximum | ≤ 77 ug/L | all year |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year |
| Aluminum, total recoverable | monthly average | ≤ 109 ug/L | all year |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jul–Sep |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | Jul–Sep |
| Lead, total recoverable | monthly average | ≤ 1.1 ug/L | all year |
| Copper, total recoverable | monthly average | ≤ 6.2 ug/L | all year |
| Copper, total recoverable | daily maximum | ≤ 8.2 ug/L | 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 | annual average | ≤ 6 MGD | all year |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | ≤ 406 #/100mL | 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 | ≤ 1252 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2253 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 2003 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous, 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 | ≥ 100 % | Jul–Sep |
| LC50 Static 48Hr Acute Pimephales promelas | monthly average minimum | ≥ 100 % | Jul–Sep |
| NOEL Static 7Day Chronic Ceriodaphnia dubia | monthly average minimum | ≥ 50 % | Jul–Sep |
| Noel Static 7Day Chronic Pimephales | monthly average minimum | ≥ 50 % | Jul–Sep |
Cited limits by parameter: New Hampshire's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/NH0100790 · MCP: https://passage-data.com/mcp