2026 Rankings

Worst ZIP Codes for Lead in Water in Massachusetts —...

Last updated: August 11, 2026

411 ZIP codes ranked by Lead (ppb) #1: ZIP 01026 (Cummington, MA) - 17.5 ppb
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 411 ZIP codes with data in Massachusetts, these are the highest-ranked areas for lead (ppb). See also: National Worst ZIP Codes for Lead in Water | All Massachusetts Rankings

Statistic Value
ZIP codes ranked 411
Highest value 17.5 ppb
Median value 3.0 ppb
State Massachusetts

Top 100 Worst ZIP Codes

Rank ZIP Code City State Lead (ppb) Safety Score
1 01026 Cummington MA 17.5 ppb —
2 01510 Clinton MA 16.9 ppb 67/100
3 01523 Lancaster MA 16.9 ppb 50/100
4 01225 Cheshire MA 15.0 ppb 83/100
5 02717 East Freetown MA 12.0 ppb 83/100
6 02720 Fall River MA 12.0 ppb 83/100
7 02721 Fall River MA 12.0 ppb 83/100
8 02723 Fall River MA 12.0 ppb 83/100
9 02724 Fall River MA 12.0 ppb 83/100
10 02747 North Dartmouth MA 12.0 ppb 66/100
11 02790 Westport MA 12.0 ppb —
12 01568 Upton MA 11.0 ppb 65/100
13 01906 Saugus MA 10.2 ppb 64/100
14 02148 Malden MA 10.2 ppb 59/100
15 02176 Melrose MA 10.2 ppb 64/100
16 01938 Ipswich MA 10.0 ppb 50/100
17 02725 Somerset MA 10.0 ppb 83/100
18 02726 Somerset MA 10.0 ppb 83/100
19 02149 Everett MA 9.7 ppb 64/100
20 02151 Revere MA 9.7 ppb 99/100
21 01040 Holyoke MA 9.0 ppb 83/100
22 01073 Southampton MA 9.0 ppb 83/100
23 02169 Quincy MA 8.7 ppb 83/100
24 02170 Quincy MA 8.7 ppb 83/100
25 02171 Quincy MA 8.7 ppb 83/100
26 02184 Braintree MA 8.7 ppb 65/100
27 01801 Woburn MA 8.4 ppb 50/100
28 01867 Reading MA 8.4 ppb 67/100
29 02145 Somerville MA 8.3 ppb 63/100
30 02155 Medford MA 8.3 ppb 63/100
31 01342 Deerfield MA 8.3 ppb —
32 01373 South Deerfield MA 8.3 ppb 82/100
33 01519 Grafton MA 8.3 ppb 38/100
34 01536 North Grafton MA 8.3 ppb 41/100
35 01545 Shrewsbury MA 8.3 ppb 41/100
36 01560 South Grafton MA 8.3 ppb 37/100
37 02152 Winthrop MA 8.3 ppb 99/100
38 01002 Amherst MA 8.0 ppb 83/100
39 01003 Amherst MA 8.0 ppb 83/100
40 02138 Cambridge MA 8.0 ppb 50/100
41 02139 Cambridge MA 8.0 ppb 50/100
42 02140 Cambridge MA 8.0 ppb 50/100
43 02141 Cambridge MA 8.0 ppb 50/100
44 02142 Cambridge MA 8.0 ppb 50/100
45 02341 Hanson MA 8.0 ppb 66/100
46 02350 Monponsett MA 8.0 ppb 67/100
47 02472 Watertown MA 8.0 ppb 67/100
48 02767 Raynham MA 8.0 ppb 67/100
49 02186 Milton MA 7.7 ppb 83/100
50 01748 Hopkinton MA 7.4 ppb 50/100
51 01843 Lawrence MA 7.2 ppb 67/100
52 01845 North Andover MA 7.2 ppb 64/100
53 02568 Vineyard Haven MA 7.2 ppb 82/100
54 02052 Medfield MA 7.0 ppb 66/100
55 02740 New Bedford MA 7.0 ppb 83/100
56 02744 New Bedford MA 7.0 ppb 83/100
57 02748 South Dartmouth MA 7.0 ppb 66/100
58 01057 Monson MA 6.4 ppb 83/100
59 01069 Palmer MA 6.4 ppb 83/100
60 01301 Greenfield MA 6.2 ppb 83/100
61 01833 Georgetown MA 6.0 ppb 65/100
62 02038 Franklin MA 6.0 ppb 61/100
63 02338 Halifax MA 6.0 ppb 66/100
64 02539 Edgartown MA 6.0 ppb 83/100
65 02026 Dedham MA 5.8 ppb 66/100
66 02108 Boston MA 5.8 ppb 100/100
67 02109 Boston MA 5.8 ppb 100/100
68 02110 Boston MA 5.8 ppb 100/100
69 02111 Boston MA 5.8 ppb 100/100
70 02113 Boston MA 5.8 ppb 100/100
71 02114 Boston MA 5.8 ppb 100/100
72 02115 Boston MA 5.8 ppb 100/100
73 02116 Boston MA 5.8 ppb 100/100
74 02118 Boston MA 5.8 ppb 100/100
75 02119 Roxbury MA 5.8 ppb 100/100
76 02120 Roxbury Crossing MA 5.8 ppb 100/100
77 02121 Dorchester MA 5.8 ppb 100/100
78 02122 Dorchester MA 5.8 ppb 100/100
79 02124 Dorchester Center MA 5.8 ppb 100/100
80 02125 Dorchester MA 5.8 ppb 100/100
81 02126 Mattapan MA 5.8 ppb 100/100
82 02127 Boston MA 5.8 ppb 100/100
83 02128 Boston MA 5.8 ppb 100/100
84 02129 Charlestown MA 5.8 ppb 100/100
85 02130 Jamaica Plain MA 5.8 ppb 100/100
86 02131 Roslindale MA 5.8 ppb 100/100
87 02132 West Roxbury MA 5.8 ppb 100/100
88 02133 Boston MA 5.8 ppb 100/100
89 02134 Allston MA 5.8 ppb 100/100
90 02135 Brighton MA 5.8 ppb 100/100
91 02136 Hyde Park MA 5.8 ppb 100/100
92 02163 Boston MA 5.8 ppb 100/100
93 02199 Boston MA 5.8 ppb 100/100
94 02205 Boston MA 5.8 ppb 100/100
95 02210 Boston MA 5.8 ppb 100/100
96 02215 Boston MA 5.8 ppb 100/100
97 02445 Brookline MA 5.8 ppb 83/100
98 02446 Brookline MA 5.8 ppb 83/100
99 02467 Chestnut Hill MA 5.8 ppb 81/100
100 01056 Ludlow MA 5.6 ppb 83/100

Methodology

Lead rankings are based on the 90th percentile lead testing value (PB90) reported by water systems under the Lead and Copper Rule. When CCR data is unavailable, EPA SDWIS lead sampling data is used. The EPA action level for lead is 15 ppb (0.015 mg/L). There is no safe level of lead exposure.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-08-11.

Frequently Asked Questions

What is a dangerous lead level in water?

The EPA action level is 15 parts per billion (ppb). The American Academy of Pediatrics recommends no more than 1 ppb for school drinking water. There is no safe level of lead exposure for children.

How is lead measured in water?

Water systems collect samples from homes with known lead service lines or lead solder. The 90th percentile value (PB90) means 90% of samples tested below that level. If PB90 exceeds 15 ppb, the system must take corrective action.

Explore More Rankings

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

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Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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