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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · New Hampshire

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81 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

81 results

CompareNameNative sizeYear
Manchester WWTFManchester34 MGD (million gallons per day)2022
Nashua WWTFNashua16 MGD (million gallons per day)2022
Franklin WWTF - WRBPFranklin11.54 MGD (million gallons per day)2022
Concord Hall Street WWTFConcord10.1 MGD (million gallons per day)2022
Portsmouth WWTFPortsmouth6.13 MGD (million gallons per day)2022
Keene WWTFKeene6 MGD (million gallons per day)2022
Rochester WWTFRochester5.03 MGD (million gallons per day)2022
Merrimack WWTFMerrimack5 MGD (million gallons per day)2022
Hampton WWTFHampton4.7 MGD (million gallons per day)2022
Dover WWTFDover4.7 MGD (million gallons per day)2022
Derry WWTFDerry4.09 MGD (million gallons per day)2022
Claremont WWTFClaremont3.89 MGD (million gallons per day)2022
Lebanon WWTFWest Lebanon3.18 MGD (million gallons per day)2022
Exeter WWTFExeter3 MGD (million gallons per day)2022
Berlin WWTFBerlin2.64 MGD (million gallons per day)2022
Durham WWTFDurham2.5 MGD (million gallons per day)2022
Somersworth WWTFSomersworth2.4 MGD (million gallons per day)2022
Penacook WWTFConcord2.37 MGD (million gallons per day)2022
Hanover WWTFHanover2.3 MGD (million gallons per day)2022
Milford WWTFMilford2.15 MGD (million gallons per day)2022
Seabrook WWTFSeabrook1.8 MGD (million gallons per day)2022
Ashland WWTFAshland1.6 MGD (million gallons per day)2022
North Conway WWTFNorth Conway1.5 MGD (million gallons per day)2022
Littleton WWTFLittleton1.5 MGD (million gallons per day)2022
Allenstown Regional WWTFSuncook1.35 MGD (million gallons per day)2022
Lincoln WWTFLincoln1.3 MGD (million gallons per day)2022
Newport WWTFNewport1.3 MGD (million gallons per day)2022
Jaffrey WWTFJaffrey1.258 MGD (million gallons per day)2022
Lancaster WWTFLancaster1.2 MGD (million gallons per day)2022
Pease Development WWTFPortsmouth1.2 MGD (million gallons per day)2022
Hooksett WWTFHooksett1.1 MGD (million gallons per day)2022
Charlestown WWTFCharlestown1.1 MGD (million gallons per day)2022
Newport - Guild Street WWTFGuild1.04 MGD (million gallons per day)2022
Newmarket WWTFNewmarket0.85 MGD (million gallons per day)2022
Gorham WWTFGorham0.75 MGD (million gallons per day)2022
Plymouth WWTFPlymouth0.7 MGD (million gallons per day)2022
Sunapee WWTFSunapee0.64 MGD (million gallons per day)2022
Peterborough WWTFPeterborough0.62 MGD (million gallons per day)2022
Wolfeboro WWTFWolfeboro0.6 MGD (million gallons per day)2022
Waterville Valley WWTFWaterville Valley0.55 MGD (million gallons per day)2022
Bristol WWTFBristol0.54 MGD (million gallons per day)2022
Henniker WWTFHenniker0.51 MGD (million gallons per day)2022
Epping WWTFEpping0.5 MGD (million gallons per day)2022
Hillsborough WWTFHillsborough0.475 MGD (million gallons per day)2022
Colebrook WWTFColebrook0.45 MGD (million gallons per day)2022
Pittsfield WWTFPittsfield0.4 MGD (million gallons per day)2022
Groveton WWTFNorthumberland0.367 MGD (million gallons per day)2022
Farmington WWTFFarmington0.35 MGD (million gallons per day)2022
Bethlehem WWTFBethlehem0.34 MGD (million gallons per day)2022
Woodstock WWTFWoodstock0.34 MGD (million gallons per day)2022
Woodsville WWTFWoodsville0.325 MGD (million gallons per day)2022
Lisbon WWTFLisbon0.32 MGD (million gallons per day)2022
Hinsdale WWTFHinsdale0.3 MGD (million gallons per day)2022
Newington WWTFNewington0.29 MGD (million gallons per day)2022
Winchester WWTFWinchester0.28 MGD (million gallons per day)2022
Troy WWTFTroy0.26 MGD (million gallons per day)2022
Greenville WWTFGreenville0.233 MGD (million gallons per day)2022
Antrim WWTFAntrim0.21 MGD (million gallons per day)2022
Whitefield WWTFWhitefield0.185 MGD (million gallons per day)2022
West Swanzey WWTFSwanzey0.167 MGD (million gallons per day)2022
Rollinsford WWTFRollinsford0.15 MGD (million gallons per day)2022
Hopkinton WWTFContoocook0.12 MGD (million gallons per day)2022
Newfields WWTFNewfields0.117 MGD (million gallons per day)2022
Warner WWTFWarner0.11 MGD (million gallons per day)2022
Milton WWTFMilton0.1 MGD (million gallons per day)2022
Rockingham County Home WWTFBrentwood0.084 MGD (million gallons per day)2022
New Hampton Village WWTFNew Hampton0.08 MGD (million gallons per day)2022
Merrimack County Home WWTFConcord0.08 MGD (million gallons per day)2022
Meriden WWTFPlainfield0.08 MGD (million gallons per day)2022
Canaan WWTFCanaan0.075 MGD (million gallons per day)2022
Northumberland Village WWTFNorthumberland0.06 MGD (million gallons per day)2022
Stratford Village WWTFNorth Stratford0.06 MGD (million gallons per day)2022
Newbury WWTFNewbury0.05 MGD (million gallons per day)2022
Wakefield Sanbornville WWTFSanbornville0.05 MGD (million gallons per day)2022
Cheshire County Home WWTFWestmoreland0.04 MGD (million gallons per day)2022
Pittsburg WWTFPittsburg0.04 MGD (million gallons per day)2022
Glencliff WWTFWarren0.03 MGD (million gallons per day)2022
Carroll County Home WWTFOssipee0.028 MGD (million gallons per day)2022
Stratford Millhouse WWTFNorth Stratford0.02 MGD (million gallons per day)2022
Beebe River WWTFCampton0.013 MGD (million gallons per day)2022
Lancaster Grange WWTFLancaster0.004 MGD (million gallons per day)2022

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

  • Permit identifier and permitting authority: EPA or an authorized state.
  • Outfall and receiving water; sewer connections follow a different control route.
  • Current permit conditions, limits and dated measurements; these are not included in CWNS.

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.