Just Moved Into a Home With a Private Well in NJ? Your 30-Day Water Safety Checklist
Buying a home in New Jersey is exciting. But if that home runs on a private well, there’s one thing that should be at the top of your to-do list before you unpack the last box — and it has nothing to do with paint colors or landscaping. Your well water needs to be tested, and it needs to be tested soon.
Unlike homes connected to a municipal water supply, private well owners in New Jersey are entirely responsible for the safety of their own drinking water. The state does not monitor your well. Your home inspector almost certainly did not test it comprehensively. And the previous owners may not have tested it in years. What comes out of your tap is your responsibility — and the only way to know whether it’s safe is to test it.
This checklist walks you through everything you should do in your first 30 days as a well water homeowner in New Jersey. Follow it in order, and you’ll have a clear, documented picture of your water quality — and a plan to address anything that needs attention.
Why the First 30 Days Matter
The window right after you move in is the most important time to establish a water quality baseline. You don’t yet know the history of the well — how old it is, when it was last tested, whether there have been any issues with the casing or cap, or what contaminants may be present in the local groundwater. And if your purchase contract included a water test, that test was almost certainly limited to bacteria and nitrates — the bare minimum required by most NJ lenders, not a comprehensive assessment of what’s actually in your water.
New Jersey’s groundwater carries risks that other states simply don’t have to the same degree. The state’s industrial legacy, its geology, its agricultural land, and its density of contaminated sites mean that private wells across Bergen, Morris, Somerset, Hunterdon, Monmouth, Ocean, Burlington, and Salem counties — among others — can be exposed to contaminants ranging from arsenic and iron to PFAS and radon. In Toms River, Brick, Freehold, Flemington, Parsippany, and Hackettstown, homeowners on private wells regularly discover elevated levels of one or more contaminants that weren’t flagged during the home purchase process.
The good news is that testing is straightforward, affordable, and gives you the information you need to make smart decisions about treatment — if treatment is needed at all.
Week 1: Locate and Inspect Your Well
Before you test anything, find your well and take stock of its physical condition. Your well head is typically a capped pipe or housing extending a foot or two above ground, often near the foundation or in the yard. If you’re not sure where it is, check your property survey, ask your real estate agent, or look for the pressure tank in your basement or utility room — the well line will run from outside to that tank.
Once you’ve located it, do a basic visual inspection. The well cap should be securely in place with no cracks or gaps. The casing should extend at least 12 inches above ground. There should be no standing water, debris, or obvious damage around the well head. If the area around the well is low-lying or regularly floods, that’s a red flag for potential surface water intrusion and bacterial contamination. If anything looks off, note it — you’ll want to share those observations with a licensed well driller or water treatment professional before interpreting your test results.
Also locate your pressure tank, pressure switch, and any existing filtration or treatment equipment inside the home. If the previous owners had a water softener, iron filter, UV system, or reverse osmosis unit installed, document what’s there. Equipment that hasn’t been serviced can actually introduce problems rather than solve them — a depleted carbon filter, for example, can harbor bacteria.
Week 1: Run Your Taps and Note Any Obvious Issues
Before you send any samples to a lab, spend a few days paying attention to your water. Run every tap in the house and note anything unusual. Does the water have a rotten egg or sulfur smell? That points to hydrogen sulfide, which is common in certain NJ aquifers and treatable but worth confirming. Does it have a metallic taste? That can indicate iron, manganese, or low pH. Is it leaving orange or brown stains in sinks, toilets, or the shower? Iron or manganese. Are the dishes coming out of the dishwasher cloudy? Hard water. Does the water look milky or cloudy when first drawn? That’s usually dissolved air, but it can also indicate other issues worth investigating.
None of these observations replace testing, but they help you prioritize which panels to order and give the lab useful context. Write them down.
Week 2: Order a Comprehensive Water Test
This is the most important step in the entire checklist. A comprehensive well water test from a state-certified laboratory gives you a documented baseline of your water quality that you can reference for years. Do not skip this in favor of a basic bacteria-only test — that tells you almost nothing about the full range of contaminants relevant to NJ well water.
At minimum, your first test as a new NJ well water homeowner should cover bacteria and E. coli, nitrates and nitrites, pH and general water chemistry, hardness, iron and manganese, lead, arsenic, and volatile organic compounds (VOCs). Depending on where your home is located, you should strongly consider adding PFAS testing — particularly if you’re within a few miles of a military installation, airport, industrial facility, or landfill — and radon in water, which is a separate test from air radon and affects well water homeowners across much of northern and central New Jersey. You can read more about radon in well water and how it’s treated on our water services page.
Use a laboratory certified by the New Jersey Department of Environmental Protection for drinking water analysis. The NJDEP maintains a searchable list of certified labs at nj.gov. The lab will mail you collection containers with instructions. Follow them precisely — bacteria testing in particular requires careful technique to avoid contaminating the sample. Results typically come back within five to ten business days.
The EPA provides a useful overview of what private well owners should test for and why at epa.gov/privatewells — it’s worth a read while you’re waiting for your results.
Week 2: Test for Radon in Air Separately
If your home hasn’t been tested for radon gas in the air — separate from radon in water — now is the time. Radon is the second leading cause of lung cancer in the United States, and New Jersey has significant radon risk across many counties. If a radon test was conducted as part of your home purchase, check when it was done and whether the result was below 4 pCi/L, the EPA’s action level.
If no air radon test was done, or if you want to establish a fresh baseline now that you’re living in the home, short-term radon test kits are available at hardware stores and online. Place one in the lowest livable level of the home — typically the basement, or the first floor if there is no basement — for the specified period and mail it to the lab included with the kit. If results come back at or above 4 pCi/L, a radon mitigation system should be installed. Learn more about residential radon mitigation in New Jersey and what the installation process involves.
Week 3: Review Your Results and Make a Plan
When your water test results arrive, read them carefully. Each parameter will be listed alongside its detected concentration and the applicable standard — either the EPA maximum contaminant level (MCL) or the NJ state MCL, whichever is more stringent. Results above the MCL require action. Results below the MCL are within regulatory limits, though some parameters may still warrant attention depending on your household’s specific situation.
Common findings for new NJ well water homeowners and what they typically mean: elevated bacteria requires shock chlorination followed by retesting; high iron or manganese calls for an iron filtration system; elevated hardness is addressed with a water softener; arsenic above the 10 parts per billion MCL requires a certified treatment system, typically an adsorptive media filter or reverse osmosis unit; PFAS above state MCLs calls for reverse osmosis or granular activated carbon treatment; radon in water above recommended levels is addressed with an aeration or carbon treatment system.
If your results show multiple issues, a water treatment professional can help you design a system that addresses all of them efficiently — rather than stacking individual filters that may or may not work together. The right sequence matters, and the right technology depends on what’s actually in your water. Visit our water problems page to see the full range of issues we diagnose and treat for NJ homeowners.
Week 3: Check and Service Any Existing Treatment Equipment
If the home came with a water softener, iron filter, UV disinfection system, or any other water treatment equipment, have it inspected and serviced before relying on it. Water softeners need salt, proper regeneration settings, and periodic resin cleaning. UV systems require annual bulb replacement to maintain effectiveness. Carbon filters have a finite lifespan and should be replaced on schedule. Reverse osmosis membranes typically need replacement every two to three years.
Equipment that was installed by the previous owners but never maintained is not protecting you — and in some cases, an overdue carbon filter or neglected UV system can make water quality worse, not better. A service call from a qualified water treatment technician will tell you whether what’s in place is functioning, whether it’s appropriate for your actual water chemistry based on your new test results, and whether anything needs to be replaced or upgraded.
Week 4: Document Everything and Set Your Testing Schedule
By the end of your first month, you should have a complete picture of your well’s physical condition, your baseline water quality results, the status of any existing treatment equipment, and a plan for addressing any issues identified. Put all of this in a folder — physical or digital — along with the well driller’s report if you were able to obtain one from the previous owners or the county health department.
Going forward, plan to test for bacteria and nitrates annually, and run a broader panel every two to three years. Retest any time you notice a change in your water’s taste, color, or smell; after any flooding or nearby construction activity; after repairs to the well or plumbing; or when a new family member — particularly an infant — joins the household. Consistent testing is what keeps a private well safe over the long term. It’s low-cost, low-effort, and the single most important thing a well water homeowner can do.
Your Well Water, Your Responsibility — and Your Peace of Mind
Moving into a home with a private well in New Jersey comes with real responsibility — but it also comes with real control. Unlike municipal water customers, you get to know exactly what’s in your water and make informed decisions about how to treat it. That starts with testing, and it starts now.
At Jersey Radon, we help new homeowners across New Jersey — from Bridgewater and Somerville to Toms River, Freehold, Flemington, and beyond — understand their well water and install the right treatment systems to keep their families safe. If you’ve just moved in and want guidance on which tests to order, how to read your results, or what treatment options make sense for your water and your home, reach out to our team for a free consultation. We’re here to help you start your new chapter with confidence.
