WaterQ

City Water Quality Rankings in Massachusetts

281 cities ranked by drinking water quality.

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Popular city water quality comparisons

Northbridge, MA vs Westport, MA Compare → Eastham, MA vs Sandwich, MA Compare → Seekonk, MA vs Cotuit, MA Compare → Harwich, MA vs Mashpee, MA Compare →

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#1
Northbridge
County, MA
100 A
#2
Westport
County, MA
100 A
#3
Eastham
County, MA
98 A
#4
Sandwich
County, MA
98 A
#5
Seekonk
County, MA
98 A
#6
Cotuit
County, MA
96 A
#7
Harwich
County, MA
96 A
#8
Mashpee
County, MA
96 A
#9
Newton
County, MA
96 A
#10
North Plymouth
County, MA
96 A
#11
Chelsea
County, MA
95 A
#12
Barnstable
County, MA
94 A
#13
Belmont
County, MA
94 A
#14
Cambridge
County, MA
94 A
#15
Essex
County, MA
94 A
#16
Marblehead
County, MA
94 A
#17
Mendon
County, MA
94 A
#18
Milton
County, MA
94 A
#19
North Reading
County, MA
94 A
#20
South Dennis
County, MA
94 A
#21
South Easton
County, MA
94 A
#22
Warren
County, MA
94 A
#23
Wenham
County, MA
94 A
#24
Agawam
County, MA
93 A

Frequently Asked Questions

How are city water quality rankings calculated in Massachusetts?

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 Massachusetts?

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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