Public Water Systems in New Hampshire: Full List (38)

Public water system	Population served
MANCHESTER WATER WORKS	123,500
CONCORD WATER DEPT	44,215
PORTSMOUTH WATER WORKS	33,000
KEENE WATER DEPT	30,000
DOVER WATER DEPT	29,000
MERRIMACK VILLAGE DIST	25,500
ROCHESTER WATER DEPT	25,000
SALEM WATER DEPT	21,000
DERRY WATER DEPT	17,370
LACONIA WATER WORKS	17,125
HUDSON WATER DEPT	16,700
UNH/DURHAM WATER SYS	16,000
SEABROOK WATER DEPT	14,000
LEBANON WATER DEPT	13,600
EXETER WATER DEPT	12,236
SOMERSWORTH WATER WORKS	12,200
PEASE TRADE PORT	9,900
HANOVER WATER DEPT	9,600
BERLIN WATER WORKS	9,575
MILFORD WATER UTILITIES DEPT	9,500
CLAREMONT WATER DEPT	9,000
FRANKLIN WATER WORKS	7,200
PLYMOUTH VLG WATER AND SEWER	6,700
LITTLETON WATER AND LIGHT	6,500
WOLFEBORO WATER AND SEWER	6,000
NORTH CONWAY WATER PCT	5,500
PEMBROKE WATER WORKS	5,200
NEWMARKET WATER WORKS	5,030
NEWPORT WATER WORKS	5,000
CENTRAL HOOKSETT WATER PCT	4,650
PETERBOROUGH WATER WORKS	4,500
RYE WATER DIST	4,300
LOWER BARTLETT WATER PCT	3,850
JAFFREY WATER WORKS	3,800
PENACOOK BOSCAWEN WATER PCT	3,800
MEREDITH WATER DEPT	3,750
BRISTOL WATER WORKS	3,575
VILLAGE DIST OF EASTMAN	3,400

Largest first by population served, as each employer reports it to its federal registry.

Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.

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