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Monmouth County, NJ Water Quality

Water quality data for 26 public water systems serving Monmouth County, New Jersey — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 26 water systems · 52 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

Monmouth County Earns a B

Monmouth County: 52 communities across 26 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 41 communities with a lead detection, 11 reporting none detected
  • 35 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
26
Water Systems
Active CWS & NTNCWS
100%
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
  • Hazlet
    Not detected
    No federal limits exceeded on record
    A
  • Keyport
    Not detected
    No federal limits exceeded on record
    A
  • Brielle
    0.44 ppb
    No federal limits exceeded on record
    A
  • Atlantic Highlands
    1.56 ppb
    No federal limits exceeded on record
    A
  • Englishtown
    0.45 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Spring Lake Heights
    2.50 ppb
    PFAS above the limit at 1 of 2 sampling points
    C
  • Upper Freehold
    Not detected
    PFAS above the limit at 3 of 4 sampling points
    C
  • Middletown
    2.00 ppb
    PFAS above the limit at 4 of 15 sampling points
    C
  • Howell
    2.00 ppb
    PFAS above the limit at 4 of 15 sampling points
    C
  • Long Branch
    2.00 ppb
    PFAS above the limit at 4 of 15 sampling points
    C
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
41
No Data
11

All Cities in Monmouth County

Middletown 2.00 ppb C
Howell 2.00 ppb C
Freehold Not detected B
Long Branch 2.00 ppb C
Neptune 2.00 ppb C
Ocean 2.00 ppb C
Manalapan 2.32 ppb B
Wall 0.52 ppb B
Marlboro 1.00 ppb A
Tinton Falls 2.00 ppb C
Asbury Park 2.00 ppb C
Eatontown 2.00 ppb C
Freehold 0.80 ppb A
Keansburg 0.56 ppb B
Matawan Not detected C
Aberdeen 2.00 ppb C
West Long Branch 2.00 ppb C
Red Bank 0.70 ppb B
Rumson 2.00 ppb C
Keyport Not detected A
Fair Haven 2.00 ppb C
Oceanport 2.00 ppb C
Little Silver 2.00 ppb C
Manasquan 0.63 ppb B
Belmar 0.66 ppb A
Brielle 0.44 ppb A
Spring Lake Heights 2.50 ppb C
Holmdel 2.00 ppb C
Neptune City 2.00 ppb C
Highlands 2.00 ppb C
Atlantic Highlands 1.56 ppb A
Bradley Beach 2.00 ppb C
Shrewsbury 2.00 ppb C
Monmouth Beach 2.00 ppb C
Spring Lake Not detected A
Englishtown 0.45 ppb A
Avon-by-the-Sea 2.04 ppb C
Sea Girt 2.26 ppb B
Allentown 0.99 ppb A
Lake Como Not detected B
Farmingdale Not detected B
Sea Bright 2.00 ppb C
Upper Freehold Not detected C
Deal 2.00 ppb C
Interlaken 2.00 ppb C
Roosevelt Not detected B
Colts Neck Not detected B
Allenhurst 2.00 ppb C
Loch Arbour 2.00 ppb C
Millstone Not detected B
Shrewsbury 2.00 ppb C
Hazlet Not detected A
Showing 52 cities
No active violations Active violations

About Monmouth County Drinking Water

Monmouth County is served by 26 water systems covering 52 communities. No community here has an open violation on record.

Of the communities reporting lead results, 41 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 11 reported none detected, which means below the laboratory limit rather than an absence of lead.

35 of 52 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 Monmouth County tap water safe to drink?▼
No community in Monmouth County has an open violation on record. 35 of 52 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Monmouth County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 11 reported none detected and 0 reported no result.
How many water systems serve Monmouth County?▼
26 community water systems serve 52 communities here.
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