COUNTY REPORT MA

Middlesex County, Massachusetts

105 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-07-16

ZipCheckup grade for Middlesex: C.

A mixed picture - some signals here are worth your attention.

Monitoring figures for Middlesex County indicate average water quality overall - some ZIP codes among the 105 tracked have recorded health-based violations, while others operate cleanly, making individual ZIP-level data the most actionable reference point.

How Middlesex County Compares

Middlesex County58/100
Massachusetts avg66/100
National avg68/100

How Middlesex County Compares

C
County Grade
58/100
Avg Safety Score
105
ZIP Codes
92
Water Systems

Middlesex County scores 8 points below the Massachusetts state average (66/100) and 10 points below the national average (68/100).

Data: EPA SDWIS Last verified: 2026-07-16

C
County Grade
58
Avg Safety Score
105
ZIP Codes
Groton
Best ZIP: 01450 (70/100)
Malden
Lowest ZIP: 02148 (33/100)
$680K
Median Home Value
$2,466
Avg Remediation (36% of home value)

ZIP Code Risk Map

Water Quality Map: Middlesex County, Massachusetts

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Health risk index: 9.9 (asthma 11.1%, diabetes 8.5%)

Estimated additional annual cost per homeowner: $2,044, driven primarily by flood

Infrastructure: 0.45% avg pipe failure probability, 70% of ZIPs at high risk

71.7% of homes built before 1978 (lead paint era)

Violation History (2021–2025)

→ Stable trend

EPA violation counts by year across Middlesex County water systems. Health-based shown in red, total in blue.

2021
9 (9 health)
2022
12 (12 health)
2023
18 (18 health)
2025
1 (1 health)

Peak year: 2023 with 18 violations. Past 5 years: 40 total (40 health-based).

Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.

County Health Indicators vs National Average

Asthma 11.1% (national: 8.9%)
Diabetes 8.5% (national: 10.5%)
Obesity 24% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

1966
Median Build Year
71.7%
Pre-1978 Housing
45%
Pipe Failure Probability
70%
ZIPs at High Infra Risk
High
Lead Pipe Risk

Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $2,044

Flood $1,157/yr
Energy Code Gap $505/yr
Sea Level Rise $400/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Housing Age Distribution

637,750 housing units in Middlesex County

Pre-1940 33%
1940–1959 16%
1960–1979 21%
1980–1999 16%
2000+ 14%

Source: U.S. Census Bureau ACS B25034 (Year Structure Built).

Water Safety Affordability

How much it costs to fix water issues relative to home values in Middlesex County

$680K
Median Home Value
$2,466
Est. Remediation Cost
0.4%
of Home Value
Remediation as % of home value low burden

Remediation costs are relatively manageable for most homeowners in Middlesex County, representing a small fraction of property value.

Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.

Health Outcomes vs National Average

CDC PLACES data for Middlesex County residents

Asthma 11.1% (US avg: 8.9%)
Diabetes 8.5% (US avg: 11%)
Obesity 24% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water systems serving Middlesex County

8 community water systems serving Middlesex County.

Show all 8 water systems

92 total water systems serve Middlesex County.

Systems with the most violations in Middlesex County

5 water systems with recorded EPA violations.

All ZIP Codes in Middlesex County

105 ZIP codes tracked in Middlesex County.

# ZIP Code City Safety Score Grade Violations Home Value
1 01450 Groton 70 B 0 $674K
2 01460 Littleton 70 B 1 $633K
3 01703 Framingham 70 B 0 —
4 01705 Framingham 70 B 0 —
5 01741 Carlisle 70 B 0 $1056K
6 02143 Somerville 70 B 0 $930K
7 02144 Somerville 70 B 0 $987K
8 02180 Stoneham 70 B 0 $629K
9 01754 Maynard 69 C 2 $494K
10 01775 Stow 69 C 2 $658K
11 01432 Ayer 68 C 5 $420K
12 01850 Lowell 68 C 1 $367K
13 01888 Woburn 68 C 1 —
14 01770 Sherborn 67 C 1 $944K
15 01470 Groton 66 C 0 —
16 01471 Groton 66 C 0 —
17 01704 Framingham 66 C 0 —
18 01827 Dunstable 66 C 0 $624K
19 01889 North Reading 66 C 0 —
20 01463 Pepperell 65 C 1 $460K
21 01719 Boxborough 65 C 23 (1 health) $672K
22 01886 Westford 65 C 1 $689K
23 02145 Somerville 65 C 0 $785K
24 02454 Waltham 65 C 2 —
25 02493 Weston 65 C 0 $1586K
26 01464 Shirley 64 C 2 $413K
27 01720 Acton 64 C 2 $767K
28 01805 Burlington 64 C 1 —
29 01807 Woburn 64 C 1 —
30 01808 Woburn 64 C 1 —
31 01813 Woburn 64 C 1 —
32 01815 Woburn 64 C 1 —
33 01853 Lowell 64 C 1 —
34 01887 Wilmington 64 C 1 (1 health) $646K
35 02453 Waltham 64 C 2 $666K
36 02471 Watertown 64 C 1 —
37 02477 Watertown 64 C 1 —
38 01721 Ashland 63 C 1 $586K
39 01773 Lincoln 63 C 1 $1170K
40 01776 Sudbury 63 C 1 $939K
41 01778 Wayland 63 C 1 $936K
42 01803 Burlington 63 C 1 $679K
43 01824 Chelmsford 63 C 1 $591K
44 01852 Lowell 63 C 1 $397K
45 02141 Cambridge 63 C 0 $893K
46 02142 Cambridge 63 C 0 $1727K
47 02420 Lexington 63 C 1 $1148K
48 02421 Lexington 63 C 1 $1148K
49 02458 Newton 63 C 1 $1117K
50 02472 Watertown 63 C 1 $738K
51 02478 Belmont 63 C 1 $1109K
52 01748 Hopkinton 61 C 3 $726K
53 01826 Dracut 61 C 2 $466K
54 02149 Everett 61 C 1 $605K
55 01701 Framingham 60 C 0 $613K
56 01702 Framingham 60 C 0 $564K
57 01864 North Reading 60 C 0 $680K
58 01890 Winchester 60 C 0 $1182K
59 02476 Arlington 60 C 0 $882K
60 01469 Townsend 59 C 7 $385K
61 01730 Bedford 59 C 2 (1 health) $878K
62 01746 Holliston 59 C 7 $621K
63 02451 Waltham 59 C 2 $709K
64 02452 Waltham 59 C 2 $780K
65 01760 Natick 58 C 1 $741K
66 01801 Woburn 58 C 1 $642K
67 01851 Lowell 58 C 1 $432K
68 01854 Lowell 58 C 1 $361K
69 01863 North Chelmsford 58 C 1 $478K
70 01876 Tewksbury 58 C 5 (2 health) $547K
71 01880 Wakefield 58 C 1 $670K
72 02138 Cambridge 58 C 0 $1089K
73 02139 Cambridge 58 C 0 $1066K
74 02140 Cambridge 58 C 0 $1070K
75 01742 Concord 56 C 1 (1 health) $1139K
76 01749 Hudson 56 C 9 $480K
77 02238 Cambridge 56 C 0 —
78 02239 Cambridge 56 C 0 —
79 02474 Arlington 55 C 0 $887K
80 01474 West Townsend 53 D 0 $428K
81 02135 Brighton 53 D 0 $684K
82 01822 Billerica 51 D 3 (3 health) —
83 01866 Pinehurst 45 D 0 —
84 01879 Tyngsboro 45 D 0 $533K
85 02460 Newtonville 45 D 0 $1124K
86 01821 Billerica 43 D 3 (3 health) $581K
87 02176 Melrose 43 D 1 (1 health) $796K
88 01467 Still River 40 D 0 —
89 01472 West Groton 40 D 0 —
90 01525 Linwood 40 D 0 —
91 01718 Village Of Nagog Woods 40 D 0 $359K
92 01731 Hanscom Afb 40 D 0 —
93 01784 Woodville 40 D 0 —
94 01862 North Billerica 40 D 0 $504K
95 01865 Nutting Lake 40 D 0 —
96 02156 West Medford 40 D 0 —
97 02455 North Waltham 40 D 0 —
98 02456 New Town 40 D 0 —
99 02459 Newton Center 40 D 0 $1336K
100 02461 Newton Highlands 40 D 0 $1155K
101 02475 Arlington Heights 40 D 0 —
102 02479 Waverley 40 D 0 —
103 02495 Nonantum 40 D 0 —
104 02155 Medford 36 F 2 (2 health) $716K
105 02148 Malden 33 F 1 $608K

Recommended Buyer Guides for Middlesex County

Four sources - EPA, NSF, FEMA, CDC - drive the match.

Deep Dive Reports

Detailed analysis for Middlesex County, Massachusetts

Overview

Middlesex County in Massachusetts covers 105 ZIP codes with an average Home Safety Score of C (58/100).

57 of 105 ZIP codes have recorded EPA violations. 15 health-based violations have been documented.

← Back to Massachusetts water quality report

Data Sources

Updated daily.

Frequently Asked Questions

Is water safe in Middlesex County?
Middlesex County receives a grade of C. Some ZIP codes have recorded violations and residents in affected areas may want to test their water.
How many water systems serve Middlesex County?
Middlesex County is served by 92 public water systems that supply drinking water to residents across 105 ZIP codes.
What is the biggest environmental risk in Middlesex County?
The primary environmental risk factor in Middlesex County is flood. This contributes to an estimated additional annual cost of $2,044 per homeowner.
How old are homes in Middlesex County?
The median home build year in Middlesex County is 1966. 71.7% of homes were built before 1978, which means they may contain lead-based paint and older plumbing materials.
How does Middlesex County compare to Massachusetts?
Middlesex County has an average water safety score of 58/100, which is below the Massachusetts state average of 66/100.

How to cite this page

APA ZipCheckup. (2026). Middlesex County, MA: Lead Above EPA Limits - 58/100 (2026). https://zipcheckup.com/county/massachusetts/middlesex/
BibTeX 
@misc{zipcheckup-county-massachusetts-middlesex,
  author = {{ZipCheckup}},
  title  = {{Middlesex County, MA: Lead Above EPA Limits - 58/100 (2026)}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/massachusetts/middlesex/}
}

Data as of July 2026.

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