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 →

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#1
Atkinson
County, NH
100 A
#2
Bristol
County, NH
100 A
#3
Derry
County, NH
100 A
#4
Dover
County, NH
100 A
#5
Hollis
County, NH
100 A
#6
Intervale
County, NH
100 A
#7
Laconia
County, NH
100 A
#8
Manchester
County, NH
100 A
#9
Merrimack
County, NH
100 A
#10
Swanzey
County, NH
100 A
#11
Winchester
County, NH
100 A
#12
Durham
County, NH
98 A
#13
Grantham
County, NH
98 A
#14
N Swanzey
County, NH
98 A
#15
Raymond
County, NH
98 A
#16
Hinsdale
County, NH
97 A
#17
Nashua
County, NH
97 A
#18
Henniker
County, NH
96 A
#19
Milford
County, NH
96 A
#20
Newport
County, NH
96 A
#21
North Conway
County, NH
96 A
#22
Pembroke
County, NH
96 A
#23
Peterborough
County, NH
96 A
#24
Hooksett
County, NH
95 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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