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Updated 2026-10-15
County water report

Monmouth County Water Quality: 7 Cities Ranked by the Records

Monmouth County, New Jersey: 7 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Monmouth County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanoic acid (PFOA)Detected in 4 systems of 7 tested4.0 ng/L federal MCL (2024) · US EPAHighest8.3 ng/L
LithiumDetected in 3 systems of 7 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest15.3 µg/L
Lead (90th percentile)Detected in 6 systems of 7 tested15 µg/L federal action level · US EPAHighest1.7 µg/L
Perfluorohexanoic acid (PFHxA)Detected in 4 systems of 7 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest4.4 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 4 systems of 7 testedNo federal or state limit; shown for transparencyHighest4.2 ng/L
26 PFAS tested, none detected in any systemShow

Tested in these 7 systems: BELMAR WATER DEPT, FREEHOLD BOROUGH WATER D, KEANSBURG WATER & SEWER DEPT., MANASQUAN WATER DEPARTME, MARLBORO TOWNSHIP WATER UTILITY DIVISION, RED BANK WATER DEPT, SPRING LAKE WATER DEPARTMENT

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanesulfonic acid (PFBS)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
7 cities

Cities ranked by the records

Showing 6 of 7 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Monmouth County4 of 7 city reports had a PFAS sample above a 2024 EPA limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in New Jersey
Lead

0of 7 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in New Jersey
Who supplies the county

Largest water systems

  1. MarlboroMARLBORO TOWNSHIP WATER UTILITY DIVISION · NJ1328002
    29,480 served
  2. BelmarBELMAR WATER DEPT · NJ1306001
    20,000 served
  3. ManasquanMANASQUAN WATER DEPARTME · NJ1327001
    14,000 served
  4. Red BankRED BANK WATER DEPT · NJ1340001
    12,520 served
  5. Spring LakeSPRING LAKE WATER DEPARTMENT · NJ1348001
    11,270 served
  6. FreeholdFREEHOLD BOROUGH WATER D · NJ1315001
    11,029 served
  7. KeansburgKEANSBURG WATER & SEWER DEPT. · NJ1321001
    10,105 served
Questions

Frequently asked

How does Monmouth County tap water compare across cities?

PurityMap ranks 7 cities in Monmouth County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Spring Lake's main water system: SPRING LAKE WATER DEPARTMENT · PWSID NJ1348001 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Monmouth County cities had a PFAS sample above a 2024 EPA limit?

4 of 7 Monmouth County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Keansburg (PFOA 8.3 ng/L), Red Bank (PFOA 6.6 ng/L), Marlboro (PFOA 6.5 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 4.

Is there lead in Monmouth County tap water?

Utilities report lead as a 90th-percentile result from home taps. 6 of 7 Monmouth County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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