States › New Jersey › Sussex County

Sussex County, NJ Water Quality

Water quality data for 18 public water systems serving Sussex County, New Jersey — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 18 water systems · 22 cities
⚠️
Caution Advised — Some Systems Need Attention

Some systems have elevated lead levels or active violations. Check your specific city below.

C

Sussex County Earns a C

Sussex County: 22 communities across 18 water systems. 81.8% have no open violations.

  • Median lead where detected: 2.01 ppb
  • 15 communities with a lead detection, 7 reporting none detected
  • 5 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 81.8% of communities have no open violations
2.01 ppb
Median Lead Level
County-wide, 90th percentile
18
Water Systems
Active CWS & NTNCWS
81%
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
  • Franklin
    1.09 ppb
    No federal limits exceeded on record
    A
  • Vernon
    4.15 ppb
    No federal limits exceeded on record
    B
  • Hamburg
    2.01 ppb
    No federal limits exceeded on record
    A
  • Ogdensburg
    Not detected
    No federal limits exceeded on record
    B
  • Hardyston
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Sparta
    1.04 ppb
    PFAS above the limit at 8 of 13 sampling points
    F
  • Lake Mohawk
    1.04 ppb
    PFAS above the limit at 8 of 13 sampling points
    F
  • Byram
    1.04 ppb
    PFAS above the limit at 8 of 13 sampling points
    F
  • Green
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Stanhope
    5.88 ppb
    PFAS above the limit at 2 of 3 sampling points
    C
County Lead Level — Median 2.01 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.01 ppb — 13.4% of the federal action level
Systems by Lead Level
Under 5 ppb
11
5 – 10 ppb
4
No Data
7

All Cities in Sussex County

Sparta 1.04 ppb F
Hopatcong 8.45 ppb C
Lake Mohawk 1.04 ppb F
Newton 2.75 ppb C
Franklin 1.09 ppb A
Stanhope 5.88 ppb C
Vernon 4.15 ppb B
Hamburg 2.01 ppb A
Ogdensburg Not detected B
Sussex Not detected C
Hardyston Not detected B
Wantage Not detected C
Byram 1.04 ppb F
Montague 1.00 ppb B
Stillwater Not detected B
Andover 8.40 ppb B
Branchville 1.16 ppb C
Hampton 9.50 ppb B
Andover 3.17 ppb B
Green Not detected D
Fredon Not detected B
Frankford 1.16 ppb C
Showing 22 cities
No active violations Active violations

About Sussex County Drinking Water

Sussex County is served by 18 water systems covering 22 communities. 82% have no open violations.

Of the communities reporting lead results, 15 recorded a detection, with a median of 2.01 ppb — 13% of the federal action level. 7 reported none detected, which means below the laboratory limit rather than an absence of lead.

5 of 22 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Sussex County tap water safe to drink?▼
82% of communities have no open violation. 5 of 22 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Sussex County?▼
Among communities with a detection the median is 2.01 ppb, 13% of the 15 ppb action level. 7 reported none detected and 0 reported no result.
How many water systems serve Sussex County?▼
18 community water systems serve 22 communities here.
← Back to New Jersey water quality overview