WaterQ

City Water Quality Rankings in New Hampshire

83 cities ranked by drinking water quality.

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Popular city water quality comparisons

Atkinson, NH vs Bristol, NH Compare → Derry, NH vs Dover, NH Compare → Hollis, NH vs Intervale, NH Compare → Laconia, NH vs Manchester, NH Compare →

Trending Cities

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#25
Portsmouth
County, NH
95 A
#26
Conway
County, NH
94 A
#27
Hudson
County, NH
94 A
#28
Plymouth
County, NH
94 A
#29
Somersworth
County, NH
94 A
#30
Brentwood
County, NH
92 A
#31
Hanover
County, NH
92 A
#32
Jaffrey
County, NH
92 A
#33
North Woodstock
County, NH
92 A
#34
Rochester
County, NH
92 A
#35
Waterville Valley
County, NH
92 A
#36
Wilton
County, NH
92 A
#37
Wolfeboro
County, NH
92 A
#38
Plaistow
County, NH
91 A
#39
Berlin
County, NH
90 A
#40
Franklin
County, NH
90 A
#41
Groveton
County, NH
90 A
#42
Keene
County, NH
90 A
#43
Littleton
County, NH
90 A
#44
Newmarket
County, NH
90 A
#45
Rindge
County, NH
90 A
#46
Salem
County, NH
90 A
#47
Seabrook
County, NH
90 A
#48
Tilton
County, NH
90 A

Frequently Asked Questions

How are city water quality rankings calculated in New Hampshire?

WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.

Can I compare two cities in New Hampshire?

Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.

How often does WaterQ refresh city data?

City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.

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