65.6
County avg score
30
Cities ranked
43%
A or B grade
33%
D or F grade
18
Health violations
27
PFAS detected
Grade Distribution
How New Haven cities scored
A
5
17%
Excellent
B
8
27%
Good
C
7
23%
Fair
D
6
20%
Poor
F
4
13%
Failing
Comparison
County vs Connecticut average
▲ 4.8 pts above state average
City Map
Water quality across New Haven
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in New Haven
Full Rankings
All 30 cities in New Haven
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Naugatuck | A | 90.8 | 23K | 10 | Health Unresolved | |
| 2 | Branford | A- | 85.4 | 419K | 32 | PFAS Unresolved | |
| 3 | East Haven | A- | 85.4 | 419K | 32 | PFAS Unresolved | |
| 4 | Hamden | A- | 85.4 | 419K | 32 | PFAS Unresolved | |
| 5 | New Haven | A- | 85.4 | 419K | 32 | PFAS Unresolved | |
| 6 | West Haven | B+ | 84.9 | 419K | 32 | PFAS Unresolved | |
| 7 | Milford | B+ | 84.6 | 419K | 32 | PFAS Unresolved | |
| 8 | Woodbridge | B+ | 83.4 | 419K | 41 | PFAS Unresolved | |
| 9 | Ansonia | B+ | 82.4 | 419K | 41 | PFAS Unresolved | |
| 10 | Orange | B+ | 80.4 | 419K | 45 | PFAS Unresolved | |
| 11 | Derby | B+ | 80.2 | 419K | 45 | PFAS Unresolved | |
| 12 | Oxford | B | 75.8 | 13K | 35 | Health PFAS Unresolved | |
| 13 | Old Saybrook | B- | 74.3 | 34K | 288 | PFAS Unresolved | |
| 14 | Prospect | C+ | 69.1 | 419K | 126 | Health PFAS Unresolved | |
| 15 | Madison | C+ | 68.5 | 34K | 337 | Health PFAS Unresolved | |
| 16 | Meriden | C+ | 68.3 | 58K | 85 | Health PFAS Unresolved | |
| 17 | Westbrook | C+ | 66.2 | 34K | 347 | Health PFAS Unresolved | |
| 18 | Waterbury | C | 63.8 | 107K | 124 | Health Unresolved | |
| 19 | North Haven | C- | 60 | 419K | 127 | PFAS Unresolved | |
| 20 | Bethany | C- | 55.8 | 419K | 92 | Health PFAS Unresolved | |
| 21 | Clinton | D+ | 52.5 | 34K | 567 | Health PFAS Unresolved | |
| 22 | Seymour | D+ | 50.4 | 419K | 200 | Health PFAS Unresolved | |
| 23 | Watertown | D+ | 50 | 7K | 173 | Health Unresolved | |
| 24 | Wallingford | D | 49 | 37K | 180 | Health PFAS Unresolved | |
| 25 | Guilford | D | 46.8 | 34K | 482 | Health PFAS Unresolved | |
| 26 | Southbury | D | 45 | 856 | 436 | Health PFAS Unresolved | |
| 27 | North Branford | F | 39.7 | 419K | 234 | Health PFAS Unresolved | |
| 28 | Cheshire | F | 35.5 | 419K | 577 | Health PFAS Unresolved | |
| 29 | Wolcott | F | 35.5 | 3K | 663 | Health PFAS Unresolved | |
| 30 | Southington | F | 34.5 | 43K | 555 | Health PFAS Unresolved |