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Fish Hatcheries And Preserves, New Durham, New Hampshire. NPDES permit NH0000710 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 12 times (last September 2026), 2 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | pH, minimum | 5.98 SU | ≥ 6.5 SU | — |
| November 2025 | pH, minimum | 5.92 SU | ≥ 6.5 SU | — |
| December 2025 | pH, minimum | 5.88 SU | ≥ 6.5 SU | — |
| January 2026 | pH, minimum | 5.92 SU | ≥ 6.5 SU | — |
| February 2026 | pH, minimum | 5.92 SU | ≥ 6.5 SU | — |
| March 2026 | pH, minimum | 5.98 SU | ≥ 6.5 SU | — |
| April 2026 | Phosphorus, total [as P], monthly average | 13.4 ug/L | ≤ 12 ug/L | 12% |
| April 2026 | pH, minimum | 6.24 SU | ≥ 6.5 SU | — |
| May 2026 | pH, minimum | 6.34 SU | ≥ 6.5 SU | — |
| June 2026 | Phosphorus, total [as P], monthly average | 15.5 ug/L | ≤ 12 ug/L | 29% |
| August 2026 | pH, minimum | 6.18 SU | ≥ 6.5 SU | — |
| September 2026 | pH, minimum | 6.13 SU | ≥ 6.5 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Hydrogen peroxide | daily maximum | ≤ .7 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved percent saturation | daily minimum | report only (%) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8 SU | all year | 001 |
| pH | minimum | report only (SU) | all year | 001 |
| pH | maximum | report only (SU) | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 10 mg/L (alert, not enforceable) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Ammonia nitrogen, total, [as N] 30 day | monthly average | report only (mg/L) | all year | 001 |
| Ammonia nitrogen, total, [as N] 30 day | daily maximum | report only (mg/L) | all year | 001 |
| Ammonia nitrogen, total, [as N] 30 day | monthly average | report only (lb/d) | all year | 001 |
| Ammonia nitrogen, total, [as N] 30 day | daily maximum | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 12 ug/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (ug/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Fish feed used | monthly average | report only (lb/d) | all year | 001 |
| Fish feed used | daily maximum | report only (lb/d) | all year | 001 |
| Biomass, fish | monthly average | report only (lb/d) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 2 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 11 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 001 |
| Fish feed used efficiency | monthly average | report only (%) | all year | 001 |
| Formaldehyde | monthly average | ≤ 1.6 mg/L | all year | 001 |
| Formaldehyde | daily maximum | ≤ 4.6 mg/L | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Hydrogen peroxide | daily maximum | ≤ .7 mg/L | all year | 002 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 002 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 002 |
| Oxygen, dissolved percent saturation | daily minimum | report only (%) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 8 SU | all year | 002 |
| pH | minimum | report only (SU) | all year | 002 |
| pH | maximum | report only (SU) | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 10 mg/L (alert, not enforceable) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | all year | 002 |
| Solids, total suspended | daily maximum | report only (lb/d) (alert, not enforceable) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 002 |
| Ammonia nitrogen, total, [as N] 30 day | monthly average | report only (mg/L) | all year | 002 |
| Ammonia nitrogen, total, [as N] 30 day | daily maximum | report only (mg/L) | all year | 002 |
| Ammonia nitrogen, total, [as N] 30 day | monthly average | report only (lb/d) | all year | 002 |
| Ammonia nitrogen, total, [as N] 30 day | daily maximum | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 12 ug/L | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (ug/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Fish feed used | monthly average | report only (lb/d) | all year | 002 |
| Fish feed used | daily maximum | report only (lb/d) | all year | 002 |
| Biomass, fish | monthly average | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 4.2 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 11 ug/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 002 |
| Fish feed used efficiency | monthly average | report only (%) | all year | 002 |
| Formaldehyde | monthly average | ≤ 1.6 mg/L | all year | 002 |
| Formaldehyde | daily maximum | ≤ 4.6 mg/L | all year | 002 |
| Transparency, secchi disc | monthly average | report only (m) | May–Oct | SUM |
| Nitrogen, total [as N] | monthly average | report only (ug/L) | May–Oct | SUM |
| Phosphorus, total [as P] | monthly average | ≤ 19 lb/mo | all year | SUM |
| Phosphorus, total [as P] | rolling average | ≤ 227 lb/yr | all year | SUM |
| Phosphorus, total [as P] | monthly average | report only (ug/L) | May–Oct | SUM |
| Chlorophyll A | monthly average | report only (ug/L) | May–Oct | SUM |
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/NH0000710 · MCP: https://passage-data.com/mcp