Water Testing for Wells and City Water in Central New Jersey

Why the lab matters more than the kit

Hardware store strips and color-change kits are fine for a rough hardness or chlorine read. They are not what a lender, a buyer, or a health department will accept, and they cannot measure things like arsenic, PFAS, or volatile organic compounds at the levels that matter.

For decisions that carry weight, use a laboratory certified by the New Jersey Department of Environmental Protection for each analysis you need. The state keeps a searchable list of certified labs, and townships such as Hopewell link to it from their water pages. Certification is by test method, so a lab approved for bacteria may not be approved for PFAS. Ask the lab which parameters it is certified for before booking.

The consultation itself is free. If a lab analysis is ordered, the lab fee is quoted to you before anything is sampled, and you decide whether to go ahead. We do not offer free lab tests.

The Private Well Testing Act, in plain terms

New Jersey's Private Well Testing Act (PWTA) applies to homes that get drinking water from their own well. When such a home is sold, the buyer and seller must have the well tested and review the results before closing. Landlords renting out a property served by a private well must test it every five years and give tenants a copy of the results.

The required list is set in N.J.A.C. 7:9E-2.1. As of this writing it includes:

• Total coliform bacteria, with an E. coli test if coliform is present
• Nitrate
• Iron and manganese
• pH
• Regulated volatile organic compounds (VOCs)
• Lead and arsenic
• Gross alpha particle activity, using the 48-hour rapid method
• 1,2,3-trichloropropane, ethylene dibromide, and 1,2-dibromo-3-chloropropane
• PFNA, PFOA, and PFOS (added December 1, 2021)
• County add-ons: samples from Monmouth County also include mercury; samples from Mercer, Middlesex, and Somerset counties also include uranium

Fitting a well test into a home sale

Timing is the part that trips people up. Lab turnaround varies by parameter, and a positive bacteria result means disinfecting the well and sampling again, which adds days. Booking the test as soon as the contract is signed leaves room for a retest or for a treatment conversation before closing.

Read the full report, not only the pass or fail summary. Secondary items such as iron, manganese, and pH are about taste, staining, and plumbing wear rather than health, but they still drive equipment choices. Primary items such as arsenic, nitrate, coliform, gross alpha, and PFAS carry health-based limits.

If you bought before December 2021, your closing report probably predates the PFAS parameters. That alone is a reason many owners retest.

How often to test a well you already own

The PWTA covers sales and rentals, not the years in between. For that, Hopewell Township publishes a practical schedule for private wells:

• Every year, at minimum: total coliform, nitrates, pH
• Every five years: lead, VOCs, arsenic, iron, manganese
• At least once: mercury, gross alpha, uranium

Why local results vary so much

The state's HCP-NJ data shows how uneven well results can be. Statewide, 14.5% of private wells tested under the PWTA from 2002 to 2018 exceeded at least one primary standard. In Hopewell the figure was 34.2%, and in Montgomery it was 36.8%. Hillsborough's health department reported that more than 20% of wells sampled exceeded the state arsenic standard, and it advises testing every year for bacteria and nitrates. See Hillsborough for that summary. Those are percentages across many wells; your own well is only known from your own lab report.

Testing on city water: what is worth checking

If a utility serves your home, it already samples and publishes. Your own testing is about the stretch between the street and your faucet, plus questions the utility report cannot answer for your specific address.

• Lead and copper at the tap: these usually come from service lines, solder, or fixtures inside older homes rather than from the treatment plant. A first-draw sample, taken after water has sat in the pipes for several hours, shows the worst case.
• Hardness: useful before buying a softener, since a utility's average may not match your neighborhood.
• Disinfectant residual: chlorine or chloramine levels at your tap, which help choose the right carbon for a whole-house filter.
• Specific concerns: PFAS, sodium, or anything else that showed up in your utility's report and that you want measured at home.

Older city homes and lead

Housing age is a reasonable flag for lead questions. In New Brunswick, 30.7% of homes were built before 1950, and the city is identifying roughly 5,000 unknown service lines and replacing any lead or galvanized lines it finds, with completion expected by June 2027. Middlesex Water runs its own replacement program for customer-owned lead and galvanized lines with a plan to finish by 2031. If your line has not been identified yet, a tap test is a sensible interim step, and the New Brunswick page has more on the city's project.

How to read your utility's annual report

Every community water system publishes a Consumer Confidence Report (CCR), often titled an Annual Drinking Water Quality Report. The tables look dense, but a few terms unlock them.

• Units: ppm (parts per million) is used for things like hardness, sodium, and chlorine; ppb (parts per billion) for lead and arsenic; ppt (parts per trillion) for PFAS. One ppm equals 1,000 ppb, which equals 1,000,000 ppt.
• MCL: the maximum contaminant level, the enforceable limit. New Jersey sets its own MCLs for some substances, including PFOA, PFOS, and PFNA, so the limit column may differ from federal figures.
• MCLG: the goal level with no known health risk. It is not enforceable and is sometimes zero.
• Action level: used for lead and copper. Utilities report a 90th percentile result from homes sampled; exceeding the action level triggers steps by the utility, not an automatic violation.
• RUL: a recommended upper limit for secondary items such as sodium, iron, or hardness. These are about taste, staining, or diet rather than enforceable health limits.
• Running annual average: some results, including PFAS, are judged on an average across quarters, so a single high sample does not equal a violation.
• ND: not detected at the lab's reporting limit, which is different from zero.
• Range: the lowest and highest results in the year. If your utility blends sources, your tap may sit anywhere in it.

When a result comes back high

Start by confirming it. Look at the sample date, the method, and whether the lab flagged anything. For bacteria, the usual path is disinfecting the well, flushing, and resampling. For chemical results, a second sample removes doubt before money is spent.

Then match the treatment to the specific finding: a neutralizer for low pH, oxidizing filters for iron and manganese, dedicated media for arsenic, UV for bacteria, and carbon or reverse osmosis for PFAS. Our well water treatment and PFAS filtration pages explain those options. After anything is installed, retest at a certified lab to confirm it is working, and keep that report with the house records.

Getting the right test ordered

Fill out the form with your ZIP and whether you are on a well or a utility. A local water treatment professional contacts you, reviews any report you already have, and suggests which analyses are worth paying for and which are not. If you choose a lab test, the fee is stated up front.

If treatment follows, New Jersey treats installing water treatment equipment as plumbing work under N.J.A.C. 13:32, and the installer must be licensed for it.