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 → Exeter, NH vs Hollis, NH Compare → Hudson, NH vs Intervale, 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
Exeter
County, NH
100 A
#6
Hollis
County, NH
100 A
#7
Hudson
County, NH
100 A
#8
Intervale
County, NH
100 A
#9
Lakeport
County, NH
100 A
#10
Manchester
County, NH
100 A
#11
Merrimack
County, NH
100 A
#12
Plaistow
County, NH
100 A
#13
Swanzey
County, NH
100 A
#14
Winchester
County, NH
100 A
#15
Durham
County, NH
98 A
#16
Grantham
County, NH
98 A
#17
Lebanon
County, NH
98 A
#18
N Swanzey
County, NH
98 A
#19
Pembroke
County, NH
98 A
#20
Peterborough
County, NH
98 A
#21
Raymond
County, NH
98 A
#22
Waterville Valley
County, NH
98 A
#23
Windham
County, NH
98 A
#24
Hinsdale
County, NH
97 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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