Infrastructure
California vs Massachusetts: Water Quality Score
Massachusetts has a higher water quality score than California.
National Rankings
Where They Rank Nationally
See where both states fall among all 50 states for water quality score.
California
#24 · 83.7/100 (A)
Massachusetts
#12 · 87.3/100 (A)
Lowest
Highest
Top 10 States — Water Quality Score
#1
Hawaii
99.9/100 (A)
Hawaii
#2
North Carolina
99.7/100 (A)
North Carolina
#3
New Hampshire
99.5/100 (A)
New Hampshire
#4
Louisiana
98.9/100 (A)
Louisiana
#5
Alaska
97.7/100 (A)
Alaska
#6
South Dakota
96.5/100 (A)
South Dakota
#7
New Mexico
95.9/100 (A)
New Mexico
#8
Indiana
95.2/100 (A)
Indiana
#9
Oregon
90.5/100 (A)
Oregon
#10
Vermont
88.2/100 (A)
Vermont
Selected states
#24
California
83.7/100 (A)
California
#12
Massachusetts
87.3/100 (A)
Massachusetts
California ranks 24th and Massachusetts ranks 12th nationally for water quality score.
What this means
California vs Massachusetts: Water Quality Score in context
Massachusetts's water quality score is 87.3/100 (A), compared with 83.7/100 (A) in California. State tap-water score on a 100-point scale from the existing water-quality ranking.
California
83.7/100 (A)
Massachusetts
87.3/100 (A)
Difference
3.60 points
People also ask
California vs Massachusetts Water Quality Score — common questions
QWhat is California's water quality score?
California's water quality score is 83.7/100 (A).
QWhat is Massachusetts's water quality score?
Massachusetts's water quality score is 87.3/100 (A).
QWhich state has a higher water quality score — California or Massachusetts?
Massachusetts has a higher water quality score than California.
More comparisons: California vs Massachusetts
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Data source and freshness
Primary source
Data period
2026 ranking
Dataset reviewed
July 23, 2026
Method note
TapWaterData.com composite score; it is not an EPA regulatory compliance grade.