COUNTY REPORT NJ

Middlesex County, New Jersey

45 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-07-19

ZipCheckup grade for Middlesex: C.

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

Across Middlesex County's 45 ZIP codes, water safety results are uneven - a portion of systems carry active or recent violations, while others meet standards without issues.

How Middlesex County Compares

Middlesex County62/100
New Jersey avg58/100
National avg68/100

How Middlesex County Compares

C
County Grade
62/100
Avg Safety Score
45
ZIP Codes
16
Water Systems

Middlesex County scores 4 points above the New Jersey state average (58/100) and 6 points below the national average (68/100).

Data: EPA SDWIS Last verified: 2026-07-19

C
County Grade
62
Avg Safety Score
45
ZIP Codes
Perth Amboy
Best ZIP: 08862 (78/100)
Piscataway
Lowest ZIP: 08854 (45/100)
$411K
Median Home Value
$2,062
Avg Remediation (50% of home value)

ZIP Code Risk Map

Water Quality Map: Middlesex County, New Jersey

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: 10.7 (asthma 8.4%, diabetes 11.4%)

Estimated additional annual cost per homeowner: $5,282, driven primarily by sea_level

Infrastructure: 0.494% avg pipe failure probability, 91% of ZIPs at high risk

72.4% of homes built before 1978 (lead paint era)

Violation History (2021–2026)

↑ Worsening trend

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

2021
2 (2 health)
2022
4 (4 health)
2023
2 (2 health)
2024
4 (4 health)
2025
18 (18 health)
2026
6 (6 health)

Peak year: 2025 with 18 violations. Past 5 years: 34 total (34 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.

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

County Health Indicators vs National Average

Asthma 8.4% (national: 8.9%)
Diabetes 11.4% (national: 10.5%)
Obesity 29.5% (national: 32.4%)

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

Infrastructure Overview

1967
Median Build Year
72.4%
Pre-1978 Housing
49%
Pipe Failure Probability
91%
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: $5,282

Sea Level Rise $2,653/yr
Flood $1,865/yr
Energy Code Gap $491/yr

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

Housing Age Distribution

300,220 housing units in Middlesex County

Pre-1940 13%
1940–1959 22%
1960–1979 27%
1980–1999 25%
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

$411K
Median Home Value
$2,062
Est. Remediation Cost
0.5%
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 8.4% (US avg: 8.9%)
Diabetes 11.4% (US avg: 11%)
Obesity 29.5% (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

16 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

45 ZIP codes tracked in Middlesex County.

# ZIP Code City Safety Score Grade Violations Home Value
1 08862 Perth Amboy 78 B 3 (1 health) —
2 08871 Sayreville 78 B 5 —
3 08852 Monmouth Junction 77 B 4 (1 health) $489K
4 08903 New Brunswick 75 B 11 —
5 08905 New Brunswick 75 B 11 —
6 08906 New Brunswick 75 B 11 —
7 08922 New Brunswick 75 B 11 —
8 08933 New Brunswick 75 B 11 —
9 08988 New Brunswick 75 B 11 —
10 08989 New Brunswick 75 B 11 —
11 08818 Edison 74 B 6 —
12 08861 Perth Amboy 74 B 3 (1 health) $341K
13 08899 Edison 74 B 6 —
14 08904 Highland Park 73 B 1 $464K
15 08828 Helmetta 71 B 2 $321K
16 08837 Edison 69 C 6 $433K
17 08831 Monroe Township 66 C 5 $490K
18 08830 Iselin 65 C 9 $394K
19 08857 Old Bridge 65 C 4 $459K
20 08901 New Brunswick 65 C 11 $317K
21 08817 Edison 64 C 6 $411K
22 08820 Edison 64 C 6 $598K
23 08884 Spotswood 64 C 6 $358K
24 08832 Keasbey 63 C 0 $328K
25 08859 Parlin 63 C 0 $407K
26 08863 Fords 63 C 0 $414K
27 08872 Sayreville 63 C 5 $404K
28 08850 Milltown 56 C 21 (7 health) $437K
29 07069 Watchung 55 C 0 $838K
30 08512 Cranbury 55 C 0 $618K
31 08823 Franklin Park 55 C 0 $279K
32 08840 Metuchen 55 C 0 $518K
33 08902 North Brunswick 55 C 0 $402K
34 08855 Piscataway 53 D 0 —
35 07077 Sewaren 50 D 0 $415K
36 08816 East Brunswick 50 D 0 $503K
37 08879 South Amboy 50 D 0 $378K
38 08882 South River 47 D 20 (6 health) $383K
39 07060 Plainfield 45 D 0 $369K
40 07062 Plainfield 45 D 0 $374K
41 07063 Plainfield 45 D 0 $363K
42 07067 Colonia 45 D 0 $473K
43 07080 South Plainfield 45 D 0 $444K
44 07095 Woodbridge 45 D 0 $361K
45 08854 Piscataway 45 D 0 $424K

Recommended Buyer Guides for Middlesex County

Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.

Deep Dive Reports

Detailed analysis for Middlesex County, New Jersey

Overview

Middlesex County in New Jersey covers 45 ZIP codes with an average Home Safety Score of C (62/100).

26 of 45 ZIP codes have recorded EPA violations. 16 health-based violations have been documented.

← Back to New Jersey 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 16 public water systems that supply drinking water to residents across 45 ZIP codes.
What is the biggest environmental risk in Middlesex County?
The primary environmental risk factor in Middlesex County is sea_level. This contributes to an estimated additional annual cost of $5,282 per homeowner.
How old are homes in Middlesex County?
The median home build year in Middlesex County is 1967. 72.4% of homes were built before 1978, which means they may contain lead-based paint and older plumbing materials.
How does Middlesex County compare to New Jersey?
Middlesex County has an average water safety score of 62/100, which is above the New Jersey state average of 58/100.

How to cite this page

APA ZipCheckup. (2026). Middlesex County, NJ: 16 Health Violations - 62/100 (2026). https://zipcheckup.com/county/new-jersey/middlesex/
BibTeX 
@misc{zipcheckup-county-new-jersey-middlesex,
  author = {{ZipCheckup}},
  title  = {{Middlesex County, NJ: 16 Health Violations - 62/100 (2026)}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/new-jersey/middlesex/}
}

Data as of July 2026.

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