Mercer County water treatment
Water treatment for Princeton and Mercer County: hard water and chloramine on NJ American Water, arsenic in wells, PFAS, and a free water analysis.
Where Mercer County's water comes from
Mercer County homes get water from New Jersey American Water and other utilities, and private wells in less developed areas. New Jersey's Private Well Testing Act requires a certified-lab well test when a home is sold, and every five years for landlords[1].
Key issues
- Hard water and chloramine: New Jersey American Water reports 5–13 gpg hardness and chloramine disinfection for its Raritan system[2]. See hard water and chloramine.
- Arsenic in wells: 5.7% of 89,206 tested New Jersey wells exceeded 5 µg/L, with the highest rates in Bergen, Hunterdon, Mercer, and Somerset counties[3]. See arsenic.
- PFAS: 11.2% of New Jersey private wells tested from December 2021 through 2023 had at least one PFAS above a state standard[1], and many utilities reported PFOA or PFOS above the 4.0 ppt federal limit that takes effect in 2029 in EPA sampling[4].
Towns
Common problems here
Check your ZIP in Mercer County, NJ
Look up what your local water utility has reported to the EPA, then take a 60-second quiz about what you see, taste, and smell at home. We'll use both to recommend the right solution.
Get your water report
Enter your ZIP code to see your utility's violations, lead testing, and PFAS results from public EPA records, explained in plain English.
Data comes from U.S. EPA and Census public records. It covers public water systems, not private wells, and it isn't a test of your home's tap. If you're on a well, a free in-home test is the best way to know what's in your water.
Step 2
Your recommended solution
Based on your water report and quiz answers.
Common questions
How do I find out what's in my water in Mercer County, NJ?
Enter your ZIP in our free report for your utility's EPA records, check your utility's annual water quality report (CCR), or book a free in-home test. On a private well, use a state-certified lab for health-related tests.
Does WÜDR install in Mercer County, NJ?
Yes. We serve Pennsylvania, New Jersey, and Delaware. Enter your ZIP in the help form and we'll confirm your address.
Clean water starts with knowing what's in it.
Sources
- NJ Department of Health: PFAS and private wells in New Jersey (July 2025). www.nj.gov/health/ceohs/documents/pfas_well_water.pdf
- NJ American Water: Raritan/Hunterdon/Mercer/Somerset typical water quality (PDF). amwater.com/njaw/resources/raritanhunterdonmercersomerset_twq.pdf
- NJ DOH Environmental Public Health Tracking: Arsenic in private wells. www-doh.nj.gov/doh-shad/indicator/summary/EPHTPrivWellArsenic.html
- U.S. EPA: UCMR occurrence data. www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule
EPA records retrieved Oct 2026 from the EPA SDWIS and UCMR 5 public datasets. Utility records describe a water system, not the tap in your home. Records can lag and may be incomplete.