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Electric Services, major discharger, Portsmouth, New Hampshire. NPDES permit NH0001473 expired Jun 30, 2023; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 95 deg F | all year | 001 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 001 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 40 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 40 MGD | all year | 001 |
| Temp. diff. between intake and discharge | monthly average | report only (deg F) | all year | 001 |
| Temp. diff. between intake and discharge | daily maximum | ≤ 25 deg F | all year | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 95 deg F | all year | 002 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 43.5 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 52.2 MGD | all year | 002 |
| Temp. diff. between intake and discharge | monthly average | report only (deg F) | all year | 002 |
| Temp. diff. between intake and discharge | daily maximum | ≤ 25 deg F | all year | 002 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 95 deg F | all year | 003 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 50.2 MGD | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 50.2 MGD | all year | 003 |
| Temp. diff. between intake and discharge | monthly average | report only (deg F) | all year | 003 |
| Temp. diff. between intake and discharge | daily maximum | ≤ 25 deg F | all year | 003 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 95 deg F | all year | 004 |
| Oxidants, total residual | instantaneous maximum | ≤ .2 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 50.2 MGD | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 50.2 MGD | all year | 004 |
| Temp. diff. between intake and discharge | monthly average | report only (deg F) | all year | 004 |
| Temp. diff. between intake and discharge | daily maximum | ≤ 25 deg F | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 8 SU | all year | 006 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 006 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 006 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 006 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 011 |
| pH | maximum | ≤ 8 SU | all year | 011 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 011 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 011 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 011 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 011 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 011 |
| pH | minimum | ≥ 6.5 SU | all year | 015 |
| pH | maximum | ≤ 8 SU | all year | 015 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 015 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 015 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 015 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 015 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 61800 gal/d | all year | 015 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 85300 gal/d | all year | 015 |
| pH | minimum | ≥ 6 SU | all year | 016 |
| pH | maximum | ≤ 9 SU | all year | 016 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 016 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 016 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 016 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 016 |
| Copper, total [as Cu] | monthly average | ≤ 1 mg/L | all year | 016 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 016 |
| Iron, total [as Fe] | monthly average | ≤ 1 mg/L | all year | 016 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 016 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 216000 gal/d | all year | 016 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 360000 gal/d | all year | 016 |
| Nitrogen, Total | daily maximum | report only (mg/L) | all year | 016 |
| pH | minimum | ≥ 6 SU | all year | 017 |
| pH | maximum | ≤ 9 SU | all year | 017 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 017 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 017 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 017 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 017 |
| Copper, total [as Cu] | monthly average | ≤ 1 mg/L | all year | 017 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 017 |
| Iron, total [as Fe] | monthly average | ≤ 1 mg/L | all year | 017 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 017 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 017 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 360000 gal/d | all year | 017 |
| Nitrogen, Total | daily minimum | report only (mg/L) | all year | 017 |
| pH | minimum | ≥ 6.5 SU | all year | 018 |
| pH | maximum | ≤ 8 SU | all year | 018 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | 018 |
| Solids, total suspended | daily maximum | ≤ 20 mg/L | all year | 018 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 018 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 018 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 018 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 018 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 108000 gal/d | all year | 020 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 108000 gal/d | all year | 021 |
| Flow rate | monthly average | ≤ 41.8 MGD | Apr–Oct | SUM |
| Flow rate | monthly average | ≤ 83.6 MGD | Jan, Feb, Mar, Nov, Dec | SUM |
| Flow rate | daily maximum | ≤ 125.8 MGD | Apr–Oct | SUM |
| Flow rate | daily maximum | ≤ 125.8 MGD | Jan, Feb, Mar, Nov, Dec | SUM |
| Flow rate | rolling average | ≤ 30.19 MGD | all year | SUM |
| Screen Efficiency | rolling average | ≤ 24 % | all year | SUM |
Cited limits by parameter: New Hampshire's rules and the federal ones.
Same industry: the 6 Electric Services permits in New Hampshire.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/NH0001473 · MCP: https://passage-data.com/mcp