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National Security, major discharger, Portsmouth, New Hampshire. NPDES permit NH0090000 expired Aug 31, 2005; its limits still apply. Last 12 months: over a limit 3 times (last February 2026), 4 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| October 2025 | 002 | Oil & Grease, daily maximum | 36 mg/L | ≤ 10 mg/L | 260% |
| October 2025 | 003 | Oil & Grease, daily maximum | 47 mg/L | ≤ 10 mg/L | 370% |
| February 2026 | 002 | Oil & Grease, daily maximum | 28 mg/L | ≤ 10 mg/L | 180% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8 SU | all year | 001 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 001 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Polynuclear Aromatic Hydrocarbons [PAHs] | daily maximum | report only (ug/L) | Apr, Sep | 001 |
| Surfactants [MBAS] | monthly average | ≤ .2 mg/L | all year | 001 |
| Trichloroethylene | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Volatile fraction organics [EPA 624] | daily maximum | report only (mg/L) | Apr, Sep | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 8 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Polynuclear Aromatic Hydrocarbons [PAHs] | daily maximum | report only (ug/L) | Apr, Sep | 002 |
| Surfactants [MBAS] | monthly average | ≤ .2 mg/L | all year | 002 |
| Trichloroethylene | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Volatile fraction organics [EPA 624] | daily maximum | report only (mg/L) | Apr, Sep | 002 |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 8 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 003 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Polynuclear Aromatic Hydrocarbons [PAHs] | daily maximum | report only (ug/L) | Apr, Sep | 003 |
| Surfactants [MBAS] | monthly average | ≤ .2 mg/L | all year | 003 |
| Trichloroethylene | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Volatile fraction organics [EPA 624] | daily maximum | report only (mg/L) | Apr, Sep | 003 |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 8 SU | all year | 004 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 004 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Polynuclear Aromatic Hydrocarbons [PAHs] | daily maximum | report only (ug/L) | Apr, Sep | 004 |
| Surfactants [MBAS] | monthly average | ≤ .2 mg/L | all year | 004 |
| Trichloroethylene | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Cyanide, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Volatile fraction organics [EPA 624] | daily maximum | report only (mg/L) | Apr, Sep | 004 |
Cited limits by parameter: New Hampshire's rules and the federal ones.
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