COUNTY REPORT MA

Middlesex County, Massachusetts

108 ZIP codes · Avg score 57/100 · Grade C · Updated

ZipCheckup grade for Middlesex County: 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 108 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 County57/100
Massachusetts avg70/100
National avg73/100

How Middlesex County Compares

C
County Grade
57/100
Avg Safety Score
108
ZIP Codes
62
Water Systems

Middlesex County scores 13 points below the Massachusetts state average (70/100) and 16 points below the national average (73/100).

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:

C
County Grade
57
Avg Safety Score
108
ZIP Codes
Groton
Best ZIP: 01450 (67/100)
Holliston
Lowest ZIP: 01746 (37/100)
$699K
Median Home Value
$2,467
Avg Remediation (35% 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: $2,083, driven primarily by flood

72.5% of homes built before 1978 (lead paint era)

Violation History (2021–2025)

↓ Improving trend

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

2021
8 (8 health)
2022
9 (9 health)
2023
12 (12 health)
2025
1 (1 health)

Peak year: 2023 with 12 violations. Past 5 years: 30 total (30 health-based). Health-based violations are declining versus the prior 2-year window.

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 23.8% (national: 32.4%)

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

Infrastructure Overview

1965
Median Build Year
72.5%
Pre-1978 Housing
48/100
Infrastructure Stress Indicator
82%
ZIPs with High Infrastructure Stress
High
Lead Pipe Risk

Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $2,083

Flood $1,144/yr
Energy Code Gap $510/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

628,751 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

$699K
Median Home Value
$2,467
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 23.8% (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

62 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

108 ZIP codes tracked in Middlesex County.

# ZIP Code City Safety Score Grade Violations Home Value
1 01450 Groton 67 C 0 $674K
2 01701 Framingham 67 C 0 $613K
3 01702 Framingham 67 C 0 $564K
4 01730 Bedford 67 C 0 $878K
5 01803 Burlington 67 C 2 $679K
6 01864 North Reading 67 C 0 $680K
7 02143 Somerville 67 C 0 $930K
8 02144 Somerville 67 C 0 $987K
9 02180 Stoneham 67 C 0 $629K
10 02472 Watertown 67 C 1 $738K
11 02474 Arlington 67 C 0 $887K
12 02476 Arlington 67 C 0 $882K
13 02493 Weston 67 C 0 $1586K
14 01460 Littleton 66 C 1 $633K
15 01887 Wilmington 66 C 1 (1 health) $646K
16 01432 Ayer 65 C 5 $420K
17 01721 Ashland 65 C 1 $586K
18 02451 Waltham 65 C 1 $709K
19 02452 Waltham 65 C 1 $780K
20 02453 Waltham 65 C 1 $666K
21 02478 Belmont 65 C 1 $1109K
22 01863 North Chelmsford 64 C 2 $478K
23 02149 Everett 64 C 2 $605K
24 02176 Melrose 64 C 1 (1 health) $796K
25 02420 Lexington 64 C 4 $1148K
26 02421 Lexington 64 C 2 $1148K
27 02458 Newton 64 C 2 $1117K
28 02459 Newton Center 64 C 2 $1336K
29 02460 Newtonville 64 C 2 $1124K
30 02461 Newton Highlands 64 C 2 $1155K
31 02462 Newton Lower Falls 64 C 2 $1265K
32 02464 Newton Upper Falls 64 C 2 $899K
33 02465 West Newton 64 C 2 $1099K
34 02466 Auburndale 64 C 2 $1165K
35 02468 Waban 64 C 2 $1809K
36 01731 Hanscom Afb 63 C 3 —
37 02145 Somerville 63 C 2 (2 health) $785K
38 02155 Medford 63 C 2 (2 health) $716K
39 02148 Malden 59 C 4 (3 health) $608K
40 01464 Shirley 50 D 1 $413K
41 01718 Village Of Nagog Woods 50 D 1 $359K
42 01720 Acton 50 D 2 (1 health) $767K
43 01742 Concord 50 D 2 (1 health) $1139K
44 01748 Hopkinton 50 D 0 $726K
45 01749 Hudson 50 D 120 $480K
46 01760 Natick 50 D 0 $741K
47 01801 Woburn 50 D 1 $642K
48 01886 Westford 50 D 1 $689K
49 02138 Cambridge 50 D 0 $1089K
50 02139 Cambridge 50 D 0 $1066K
51 02140 Cambridge 50 D 0 $1070K
52 02141 Cambridge 50 D 0 $893K
53 02142 Cambridge 50 D 0 $1727K
54 01754 Maynard 49 D 2 $494K
55 01773 Lincoln 49 D 2 (1 health) $1170K
56 01775 Stow 49 D 3 (1 health) $658K
57 01778 Wayland 49 D 1 $936K
58 01821 Billerica 49 D 3 (3 health) $581K
59 01850 Lowell 49 D 1 $367K
60 01851 Lowell 49 D 1 $432K
61 01852 Lowell 49 D 1 $397K
62 01854 Lowell 49 D 1 $361K
63 01880 Wakefield 49 D 1 $670K
64 01469 Townsend 48 D 8 $385K
65 01474 West Townsend 48 D 8 $428K
66 01826 Dracut 47 D 3 $466K
67 01862 North Billerica 47 D 6 (5 health) $504K
68 01879 Tyngsboro 47 D 2 $533K
69 01824 Chelmsford 46 D 3 $591K
70 01776 Sudbury 44 D 5 (1 health) $939K
71 01876 Tewksbury 44 D 10 (7 health) $547K
72 01463 Pepperell 40 D 30 $460K
73 01746 Holliston 37 F 32 $621K
74 01431 Ashby — — $362K
75 01470 Groton — — —
76 01471 Groton — — —
77 01472 West Groton — — —
78 01703 Framingham — — —
79 01704 Framingham — — —
80 01705 Framingham — — —
81 01719 Boxborough — — $672K
82 01741 Carlisle — — $1056K
83 01770 Sherborn — — $944K
84 01784 Woodville — — —
85 01805 Burlington — — —
86 01807 Woburn — — —
87 01808 Woburn — — —
88 01813 Woburn — — —
89 01815 Woburn — — —
90 01822 Billerica — — —
91 01827 Dunstable — — 0 $624K
92 01853 Lowell — — —
93 01865 Nutting Lake — — —
94 01866 Pinehurst — — —
95 01888 Woburn — — —
96 01889 North Reading — — —
97 01890 Winchester — — 12 $1182K
98 02156 West Medford — — —
99 02238 Cambridge — — —
100 02239 Cambridge — — —
101 02454 Waltham — — —
102 02455 North Waltham — — —
103 02456 New Town — — —
104 02471 Watertown — — —
105 02475 Arlington Heights — — —
106 02477 Watertown — — —
107 02479 Waverley — — —
108 02495 Nonantum — — —

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 108 tracked ZIP records with an average Home Safety Score of C (57/100) across 73 scored records.

56 of 75 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 16 health-based violations appear in the available health breakdown.

← Back to Massachusetts Home Safety Profile

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

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 62 public water systems that supply drinking water to residents across 108 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 $2,083 per homeowner.
How old are homes in Middlesex County?
The median home build year in Middlesex County is 1965. 72.5% 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 Home Safety Score of 57/100 under model 4.0.0, which is below the Massachusetts state average of 70/100.

How to cite this page

APA ZipCheckup. (2026). Middlesex County, MA: HSS 57/100; PFAS Found in Water. https://zipcheckup.com/county/massachusetts/middlesex/
BibTeX 
@misc{zipcheckup-county-massachusetts-middlesex,
  author = {{ZipCheckup}},
  title  = {{Middlesex County, MA: HSS 57/100; PFAS Found in Water}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/massachusetts/middlesex/}
}

Page version: August 2026.

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