2026 Rankings

ZIP Codes Ranked by Water-System Lead Results…

Last updated: October 14, 2026

394 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 394 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 394
Highest value 17.5 ppb
Median value 2.7 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 01523 Lancaster MA 16.9 ppb 50/100
3 01225 Cheshire MA 15.0 ppb 83/100
4 02717 East Freetown MA 12.0 ppb 83/100
5 02720 Fall River MA 12.0 ppb 83/100
6 02721 Fall River MA 12.0 ppb 83/100
7 02723 Fall River MA 12.0 ppb 83/100
8 02724 Fall River MA 12.0 ppb 83/100
9 02790 Westport MA 12.0 ppb —
10 01568 Upton MA 11.0 ppb 65/100
11 02176 Melrose MA 10.2 ppb 64/100
12 01938 Ipswich MA 10.0 ppb 50/100
13 02725 Somerset MA 10.0 ppb 83/100
14 02726 Somerset MA 10.0 ppb 83/100
15 02148 Malden MA 9.7 ppb 59/100
16 01040 Holyoke MA 9.0 ppb 83/100
17 02169 Quincy MA 8.7 ppb 83/100
18 02170 Quincy MA 8.7 ppb 83/100
19 02171 Quincy MA 8.7 ppb 83/100
20 01867 Reading MA 8.4 ppb 67/100
21 02155 Medford MA 8.3 ppb 63/100
22 01342 Deerfield MA 8.3 ppb —
23 01373 South Deerfield MA 8.3 ppb 82/100
24 01519 Grafton MA 8.3 ppb 38/100
25 01536 North Grafton MA 8.3 ppb 41/100
26 01560 South Grafton MA 8.3 ppb 37/100
27 02152 Winthrop MA 8.3 ppb 99/100
28 02151 Revere MA 8.1 ppb 99/100
29 01002 Amherst MA 8.0 ppb 83/100
30 01003 Amherst MA 8.0 ppb 83/100
31 02138 Cambridge MA 8.0 ppb 50/100
32 02139 Cambridge MA 8.0 ppb 50/100
33 02140 Cambridge MA 8.0 ppb 50/100
34 02141 Cambridge MA 8.0 ppb 50/100
35 02142 Cambridge MA 8.0 ppb 50/100
36 02341 Hanson MA 8.0 ppb 66/100
37 02350 Monponsett MA 8.0 ppb 67/100
38 02767 Raynham MA 8.0 ppb 67/100
39 02186 Milton MA 7.7 ppb 83/100
40 01748 Hopkinton MA 7.4 ppb 50/100
41 01845 North Andover MA 7.2 ppb 64/100
42 02568 Vineyard Haven MA 7.2 ppb 82/100
43 02052 Medfield MA 7.0 ppb 66/100
44 02747 North Dartmouth MA 7.0 ppb 66/100
45 02748 South Dartmouth MA 7.0 ppb 66/100
46 01057 Monson MA 6.4 ppb 83/100
47 01301 Greenfield MA 6.2 ppb 83/100
48 01833 Georgetown MA 6.0 ppb 65/100
49 02338 Halifax MA 6.0 ppb 66/100
50 02539 Edgartown MA 6.0 ppb 83/100
51 02108 Boston MA 5.8 ppb 100/100
52 02109 Boston MA 5.8 ppb 100/100
53 02110 Boston MA 5.8 ppb 100/100
54 02111 Boston MA 5.8 ppb 100/100
55 02113 Boston MA 5.8 ppb 100/100
56 02114 Boston MA 5.8 ppb 100/100
57 02115 Boston MA 5.8 ppb 100/100
58 02116 Boston MA 5.8 ppb 100/100
59 02118 Boston MA 5.8 ppb 100/100
60 02119 Roxbury MA 5.8 ppb 100/100
61 02120 Roxbury Crossing MA 5.8 ppb 100/100
62 02121 Dorchester MA 5.8 ppb 100/100
63 02122 Dorchester MA 5.8 ppb 100/100
64 02124 Dorchester Center MA 5.8 ppb 100/100
65 02125 Dorchester MA 5.8 ppb 100/100
66 02126 Mattapan MA 5.8 ppb 100/100
67 02127 Boston MA 5.8 ppb 100/100
68 02128 Boston MA 5.8 ppb 100/100
69 02129 Charlestown MA 5.8 ppb 100/100
70 02130 Jamaica Plain MA 5.8 ppb 100/100
71 02131 Roslindale MA 5.8 ppb 100/100
72 02132 West Roxbury MA 5.8 ppb 100/100
73 02133 Boston MA 5.8 ppb 100/100
74 02134 Allston MA 5.8 ppb 100/100
75 02135 Brighton MA 5.8 ppb 100/100
76 02136 Hyde Park MA 5.8 ppb 100/100
77 02163 Boston MA 5.8 ppb 100/100
78 02199 Boston MA 5.8 ppb 100/100
79 02210 Boston MA 5.8 ppb 100/100
80 02215 Boston MA 5.8 ppb 100/100
81 02467 Chestnut Hill MA 5.8 ppb 81/100
82 02149 Everett MA 5.7 ppb 64/100
83 01095 Wilbraham MA 5.6 ppb 83/100
84 01742 Concord MA 5.1 ppb 50/100
85 02760 North Attleboro MA 5.1 ppb 65/100
86 02763 Attleboro Falls MA 5.1 ppb —
87 01229 Glendale MA 5.0 ppb —
88 01262 Stockbridge MA 5.0 ppb —
89 01420 Fitchburg MA 5.0 ppb 50/100
90 02030 Dover MA 5.0 ppb 65/100
91 02062 Norwood MA 5.0 ppb 83/100
92 02492 Needham MA 5.0 ppb 67/100
93 02494 Needham Heights MA 5.0 ppb 67/100
94 02719 Fairhaven MA 5.0 ppb 82/100
95 01069 Palmer MA 4.9 ppb 83/100
96 01515 East Brookfield MA 4.8 ppb 66/100
97 02184 Braintree MA 4.8 ppb 65/100
98 01082 Ware MA 4.7 ppb 67/100
99 01450 Groton MA 4.7 ppb 67/100

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: 2026-10-14.

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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