States › New Jersey › Hunterdon County

Hunterdon County, NJ Water Quality

Water quality data for 17 public water systems serving Hunterdon County, New Jersey — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 17 water systems · 25 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Hunterdon County Earns a B

Hunterdon County: 25 communities across 17 water systems. 96.0% have no open violations.

  • Median lead where detected: 2.50 ppb
  • 19 communities with a lead detection, 6 reporting none detected
  • 9 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 96.0% of communities have no open violations
2.5 ppb
Median Lead Level
County-wide, 90th percentile
17
Water Systems
Active CWS & NTNCWS
96%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Hampton
    1.50 ppb
    No federal limits exceeded on record
    B
  • Frenchtown
    Not detected
    No federal limits exceeded on record
    B
  • Milford
    2.50 ppb
    No federal limits exceeded on record
    B
  • Holland
    Not detected
    No federal limits exceeded on record
    B
  • Califon
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Stockton
    1.20 ppb
    Copper above the 1,300 ppb action level
    D
  • Glen Gardner
    1.50 ppb
    Copper above the 1,300 ppb action level
    D
  • Clinton
    4.60 ppb
    PFAS above the limit at 5 of 10 sampling points
    C
  • Clinton
    4.60 ppb
    PFAS above the limit at 5 of 10 sampling points
    C
  • Lebanon
    4.60 ppb
    PFAS above the limit at 5 of 10 sampling points
    C
County Lead Level — Median 2.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.5 ppb — 16.7% of the federal action level
Systems by Lead Level
Under 5 ppb
19
No Data
6

All Cities in Hunterdon County

Raritan 2.00 ppb B
Clinton 4.60 ppb C
Readington 2.00 ppb B
Lambertville 2.00 ppb A
Flemington 3.40 ppb B
High Bridge 4.20 ppb B
Glen Gardner 1.50 ppb D
Hampton 1.50 ppb B
Frenchtown Not detected B
Milford 2.50 ppb B
Clinton 4.60 ppb C
Holland Not detected B
Califon Not detected B
Union 3.00 ppb B
Lebanon 2.50 ppb B
Bloomsbury Not detected A
Delaware Not detected B
Stockton 1.20 ppb D
West Amwell 2.00 ppb A
Lebanon 4.60 ppb C
Tewksbury Not detected B
Bethlehem 1.50 ppb B
East Amwell 2.00 ppb B
Alexandria 2.50 ppb B
Franklin 4.60 ppb C
Showing 25 cities
No active violations Active violations

About Hunterdon County Drinking Water

Hunterdon County is served by 17 water systems covering 25 communities. 96% have no open violations.

Of the communities reporting lead results, 19 recorded a detection, with a median of 2.50 ppb — 17% of the federal action level. 6 reported none detected, which means below the laboratory limit rather than an absence of lead.

9 of 25 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is Hunterdon County tap water safe to drink?▼
96% of communities have no open violation. 9 of 25 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Hunterdon County?▼
Among communities with a detection the median is 2.50 ppb, 17% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve Hunterdon County?▼
17 community water systems serve 25 communities here.
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