Cedar Knolls

Cedar Knolls, NJ receives a water quality score of 56/100 (Grade D) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 1 public water system serving the area.

Cedar Knolls's water quality score is below the national average, indicating a history of EPA violations or elevated contaminant levels. Residents are encouraged to check their specific water system report and consider additional filtration.

Cedar Knolls's score of 56 is 12 points below the New Jersey state average of 68, and below the nationwide average of roughly 78/100 across all U.S. states.

For prospective homebuyers and current residents in Cedar Knolls, the local water quality reflects the broader challenges of a Mid-Atlantic mid-size city shaped by dense, older suburban infrastructure and a legacy of industry. Because the entire municipality relies on a single water system, the substandard quality ratings suggest that the aged distribution networks may be impacting the safety and consistency of the tap water. Anyone moving to this New Jersey community should prepare to take proactive steps to monitor their household water supply and stay updated on local utility reports.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our New Jersey water quality rankings report →