Hunterdon County, New Jersey: drinking water report. Hunterdon County sits in west-central New Jersey, encompassing communities like Flemington, Clinton,…
Hunterdon County sits in west-central New Jersey, encompassing communities like Flemington, Clinton, Lambertville, and Lebanon. Water supply here is split between small municipal systems drawing from the Raritan River watershed and hundreds of private wells tapping the county's fractured bedrock aquifers. Unlike urbanized northern New Jersey counties that rely on large regional utilities, Hunterdon's rural character means most residents outside incorporated boroughs depend on individual well systems that receive no routine testing or oversight.
New Jersey's statewide testing has identified PFAS contamination across multiple watersheds, and Hunterdon County reflects this pattern. The Raritan River system, which feeds several municipal supplies in the county, has shown detectable PFAS levels in regional monitoring. Small community water systems serving developments and mobile home parks have reported exceedances for both legacy PFAS compounds like PFOA and newer replacements now under EPA scrutiny. The South Branch of the Raritan, which flows through central Hunterdon, drains areas with historical industrial activity and modern suburban development, both potential sources for persistent chemical contamination.
Private wells present a distinct challenge. Hunterdon's geology includes the Newark Basin's sedimentary rock and the Reading Prong's crystalline bedrock, both known for naturally elevated uranium and radon in groundwater. Testing by the New Jersey Geological Survey has documented uranium concentrations above health guidelines in scattered private wells throughout the county, particularly in formations with darker shale layers. Radon in water exceeds the EPA's proposed 4,000 pCi/L action level in a significant percentage of wells, though this dissolved gas primarily becomes a cancer risk when released into indoor air during showering. Lead remains a concern in older homes connected to municipal systems, particularly in towns where distribution infrastructure dates to the early 20th century.
The county's agricultural heritage creates additional water quality considerations. Nitrate from both active farming operations and aging septic systems concentrates in shallow groundwater, especially in areas with permeable soils. While municipal systems treat for nitrate when necessary, private well owners may not test frequently enough to catch seasonal spikes that pose risks to infants and pregnant women. Herbicides like atrazine and its breakdown products appear periodically in surface water monitoring, though typically below health thresholds.
Anyone on a private well should test annually for bacteria and nitrate, with periodic screening for arsenic, uranium, radon, and PFAS depending on local geology and nearby land uses. Those served by municipal systems can request their utility's Consumer Confidence Report to review detected contaminants, though these annual summaries don't capture every sampling event. Check your water for current data on your specific water source, review our water filter guide for treatment options matched to specific contaminants, order a detailed report for full historical data on your system, or visit the New Jersey state page for broader context on water quality patterns across the region.