2026 Rankings

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

Last updated: June 4, 2026

604 ZIP codes ranked by Lead (mg/L) #1: ZIP 02152 (Winthrop, MA) — 23.0 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 604 ZIP codes with data in Massachusetts, these are the highest-ranked areas for lead (mg/l). See also: National Worst ZIP Codes for Lead in Water | All Massachusetts Rankings

Statistic Value
ZIP codes ranked 604
Highest value 23.0 ppb
Median value 2.4 ppb
State Massachusetts

Top 100 Worst ZIP Codes

Rank ZIP Code City State Lead (mg/L) Safety Score
1 02152 Winthrop MA 23.0 ppb 67/100
2 02108 Boston MA 21.3 ppb 84/100
3 02109 Boston MA 21.3 ppb 79/100
4 02110 Boston MA 21.3 ppb 84/100
5 02111 Boston MA 21.3 ppb 89/100
6 02113 Boston MA 21.3 ppb 89/100
7 02114 Boston MA 21.3 ppb 84/100
8 02115 Boston MA 21.3 ppb 84/100
9 02116 Boston MA 21.3 ppb 84/100
10 02118 Boston MA 21.3 ppb 84/100
11 02119 Roxbury MA 21.3 ppb 73/100
12 02120 Roxbury Crossing MA 21.3 ppb 73/100
13 02121 Dorchester MA 21.3 ppb 73/100
14 02122 Dorchester MA 21.3 ppb 65/100
15 02124 Dorchester Center MA 21.3 ppb 55/100
16 02125 Dorchester MA 21.3 ppb 65/100
17 02126 Mattapan MA 21.3 ppb 55/100
18 02127 Boston MA 21.3 ppb 84/100
19 02128 Boston MA 21.3 ppb 84/100
20 02129 Charlestown MA 21.3 ppb 65/100
21 02130 Jamaica Plain MA 21.3 ppb 65/100
22 02131 Roslindale MA 21.3 ppb 55/100
23 02132 West Roxbury MA 21.3 ppb 55/100
24 02133 Boston MA 21.3 ppb 92/100
25 02134 Allston MA 21.3 ppb 63/100
26 02135 Brighton MA 21.3 ppb 53/100
27 02136 Hyde Park MA 21.3 ppb 55/100
28 02163 Boston MA 21.3 ppb 89/100
29 02199 Boston MA 21.3 ppb 89/100
30 02205 Boston MA 21.3 ppb 92/100
31 02210 Boston MA 21.3 ppb 84/100
32 02215 Boston MA 21.3 ppb 84/100
33 02148 Malden MA 17.9 ppb 33/100
34 01098 Worthington MA 17.5 ppb 58/100
35 02176 Melrose MA 16.3 ppb 43/100
36 01225 Cheshire MA 15.0 ppb 53/100
37 01541 Princeton MA 15.0 ppb 40/100
38 01564 Sterling MA 15.0 ppb 62/100
39 02457 Babson Park MA 15.0 ppb 53/100
40 02481 Wellesley Hills MA 15.0 ppb 45/100
41 02482 Wellesley MA 15.0 ppb 74/100
42 01235 Hinsdale MA 14.5 ppb 58/100
43 01810 Andover MA 13.8 ppb 47/100
44 01812 Andover MA 13.8 ppb 56/100
45 01899 Andover MA 13.8 ppb 56/100
46 05501 Andover MA 13.8 ppb 56/100
47 05544 Andover MA 13.8 ppb 56/100
48 02153 Medford MA 12.7 ppb 46/100
49 02155 Medford MA 12.7 ppb 36/100
50 01864 North Reading MA 12.1 ppb 60/100
51 01889 North Reading MA 12.1 ppb 66/100
52 01938 Ipswich MA 12.0 ppb 51/100
53 01568 Upton MA 11.0 ppb 50/100
54 01056 Ludlow MA 10.8 ppb 63/100
55 01095 Wilbraham MA 10.8 ppb 81/100
56 01532 Northborough MA 10.8 ppb 70/100
57 01745 Fayville MA 10.8 ppb 53/100
58 01772 Southborough MA 10.8 ppb 70/100
59 01267 Williamstown MA 10.0 ppb 78/100
60 02725 Somerset MA 10.0 ppb 42/100
61 02726 Somerset MA 10.0 ppb 37/100
62 02663 South Wellfleet MA 9.3 ppb 68/100
63 01033 Granby MA 9.0 ppb 83/100
64 01040 Holyoke MA 9.0 ppb 68/100
65 01041 Holyoke MA 9.0 ppb 73/100
66 01075 South Hadley MA 9.0 ppb 78/100
67 02169 Quincy MA 8.7 ppb 54/100
68 02170 Quincy MA 8.7 ppb 64/100
69 02171 Quincy MA 8.7 ppb 59/100
70 02269 Quincy MA 8.7 ppb 71/100
71 02180 Stoneham MA 8.7 ppb 70/100
72 01867 Reading MA 8.4 ppb 55/100
73 02150 Chelsea MA 8.3 ppb 88/100
74 02151 Revere MA 8.1 ppb 67/100
75 02138 Cambridge MA 8.0 ppb 58/100
76 02139 Cambridge MA 8.0 ppb 58/100
77 02140 Cambridge MA 8.0 ppb 58/100
78 02141 Cambridge MA 8.0 ppb 63/100
79 02142 Cambridge MA 8.0 ppb 63/100
80 02238 Cambridge MA 8.0 ppb 56/100
81 02239 Cambridge MA 8.0 ppb 56/100
82 02767 Raynham MA 8.0 ppb 76/100
83 01432 Ayer MA 7.9 ppb 68/100
84 02062 Norwood MA 7.5 ppb 65/100
85 02090 Westwood MA 7.5 ppb 55/100
86 01845 North Andover MA 7.2 ppb 55/100
87 01002 Amherst MA 7.0 ppb 75/100
88 01003 Amherst MA 7.0 ppb 72/100
89 01004 Amherst MA 7.0 ppb 72/100
90 01059 North Amherst MA 7.0 ppb 53/100
91 01475 Winchendon MA 7.0 ppb 65/100
92 01523 Lancaster MA 7.0 ppb 40/100
93 01561 South Lancaster MA 7.0 ppb 53/100
94 02184 Braintree MA 7.0 ppb 71/100
95 02185 Braintree MA 7.0 ppb 81/100
96 02368 Randolph MA 7.0 ppb 70/100
97 02112 Boston MA 6.9 ppb 92/100
98 02117 Boston MA 6.9 ppb 92/100
99 02123 Boston MA 6.9 ppb 92/100
100 02196 Boston MA 6.9 ppb 92/100

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: 2026-06-04.

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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