Rural Home CompassNew Jersey homeowner guide · Private well water
When should you test a private well in New Jersey?
New Jersey has four distinct testing decisions. A newly constructed well follows the nonpublic-water-system acceptance path; a qualifying sale or lease follows the PWTA; an existing owner follows a voluntary recurring schedule; and flooding, repairs, nearby contamination, or household risk can change the next sample.
This plan separates New Jersey’s new-well sampling rule from the PWTA consumer-information law, identifies annual, five-year, and result-based homeowner recommendations, preserves county-specific mercury and uranium boundaries, includes PFAS transaction testing, and routes records through NJDEP and the local health authority.
Four different decisions
Start with why you are testing.
New well
Complete the new-well acceptance panel before relying on the supply.
NJDEP’s current new-well flow chart applies the nonpublic-water-system panel to a newly constructed private drinking-water well. It includes a statewide core plus county-specific mercury or uranium and permits the administrative authority to add inorganic analyses appropriate to the region and aquifer.
- Have the licensed well professional, administrative authority, and certified laboratory confirm the applicable panel and accepted collection procedure before sampling.
- Keep the laboratory report with the well permit, completion record, construction details, treatment information, and local approval.
Official guidancePrivate Well Testing Act Requirements and FAQsNew Well Sampling Requirements for Nonpublic Water SystemsWell Permitting, Records, and Search Instructions
Buying or selling
Use the PWTA only when the property and transaction are covered.
The PWTA applies to a sale of property whose potable water comes from a private well on the property, including new-construction sales. The required untreated-water results must be reviewed by buyer and seller before closing. A well used only for irrigation or another nonpotable purpose is outside this trigger, and local rules can be stricter.
- Ask a NJDEP-certified PWTA laboratory to determine the property-specific parameters, certified collector, field blanks, timing, and reporting route.
- Review the complete report before closing and distinguish a current water-quality result from the construction record, treatment performance, and local approval file.
Official guidancePrivate Well Testing Act Requirements and FAQsPrivate Well Testing Information and Recommended SchedulePrivate-Well Water Quality and Local Requirements
Routine care
Keep annual, five-year, and one-time questions separate.
Outside a PWTA or new-well trigger, New Jersey encourages at least annual total-coliform, nitrate, and pH testing; at least five-year PFAS, lead, VOC, SOC, iron, and manganese testing; and at least one arsenic, mercury, gross-alpha, and uranium test. Arsenic frequency then depends on the result.
- Record annual and multi-year dates separately and retain the actual result, sampling point, treatment status, and laboratory scope.
- Use local geology, prior results, nearby notices, plumbing, and household risks to decide whether the statewide starting schedule needs a narrower or broader panel.
Official guidancePrivate Well Testing Information and Recommended ScheduleArsenic in Private Well WaterPrivate-Well Water Quality and Local Requirements
Flood, fire, or repair
Treat an opened, flooded, or repaired well as a new event.
NJDEP recommends considering testing after a flood or fire near the well, whenever the cap is removed, after known or suspected contamination, chemical spills, or nearby septic trouble. After professional shock chlorination, NJDEP advises testing about two weeks later so persistent bacterial contamination is not hidden by the initial treatment.
- Use an alternate safe water source when contamination is plausible and have the well inspected, repaired, and disinfected by the appropriate professional.
- Ask the laboratory and local health authority which microbial and source-specific chemical tests fit the event and when to collect the confirmation sample.
Official guidancePrivate Well Testing Information and Recommended SchedulePrivate Well Treatment and Post-Disinfection Testing
New wells and regulated work
The required starting tests depend on the work.
New Jersey requires one-time sampling for a newly constructed nonpublic water-system well under N.J.A.C. 7:10-12.30. This construction panel is not the same legal trigger as a later PWTA sale or lease, and the administrative authority may add region- or aquifer-specific inorganic analyses.
- Total coliform; E. coli follow-up if positive
- Nitrate
- Iron
- Manganese
- pH
- Lead
- Arsenic
- 48-hour rapid gross alpha
- Regulated volatile organic compounds
- 1,2,3-trichloropropane, ethylene dibromide, and DBCP
- PFOA, PFOS, and PFNA
- Mercury in the nine specified southern and central counties
- Uranium in the twelve specified northern and central counties
- Additional inorganic chemicals required for the region or aquifer
The responsible professional and certified laboratory determine the accepted sample and report. Do not assume a retail package satisfies a regulatory purpose.
Official basis for the new-well panelPrivate Well Testing Act Requirements and FAQsNew Well Sampling Requirements for Nonpublic Water SystemsWell Permitting, Records, and Search Instructions
Existing wells
New Jersey separates legal triggers from recurring health guidance.
The PWTA transaction panel may include up to 43 parameters. A landlord must obtain the full test every five years and provide the current result to tenants as required by the Act.
Official guidancePrivate Well Testing Act Requirements and FAQsPrivate Well Testing Information and Recommended Schedule
This is New Jersey homeowner guidance outside a legal transaction or construction trigger, not a universal annual statutory mandate.
Official guidancePrivate Well Testing Information and Recommended Schedule
Prior detections, treatment, nearby contamination, local rules, or a receiving party can justify a shorter interval or different scope.
Official guidancePrivate Well Testing Information and Recommended SchedulePFAS Information for Private Well Users
Mercury and uranium have county-specific legal boundaries in regulated panels. NJDEP recommends annual arsenic testing above 2.5 µg/L and at least every five years below that level.
Official guidancePrivate Well Testing Information and Recommended ScheduleArsenic in Private Well WaterPrivate-Well Water Quality and Local Requirements
The calendar is not the whole answer
When should the panel change?
A property in a county with mercury or uranium requirements
Do not convert the regional rules into a statewide statement. Mercury applies to Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester, Monmouth, Ocean, and Salem; uranium applies to Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex, Morris, Passaic, Somerset, Sussex, Union, and Warren.
Official guidanceNew Well Sampling Requirements for Nonpublic Water SystemsPrivate Well Testing Information and Recommended Schedule
Piedmont geology or a prior detectable arsenic result
NJDEP identifies the Piedmont as New Jersey’s highest-risk physiographic province while noting arsenic can occur elsewhere. Use the actual result: above 2.5 µg/L supports annual retesting; a lower result supports testing at least every five years.
Official guidanceArsenic in Private Well Water
A PWTA sale or lease, PFAS notice, firefighting-foam source, or known nearby release
PFOA, PFOS, and PFNA belong in the regulated PWTA panel. Outside that trigger, use a certified laboratory and property-specific evidence; do not infer contamination from a statewide map or a neighbor’s result.
Official guidancePrivate Well Testing Act Requirements and FAQsPFAS Information for Private Well Users
A child, pregnancy, recurrent gastrointestinal illness, neighbor problem, or septic malfunction
NJDEP names these circumstances as reasons to test now. Start with the exposure or likely pathway, then ask the local health authority and certified laboratory which microbial, nitrate, lead, or site-specific analyses fit.
Official guidancePrivate Well Testing Information and Recommended Schedule
A flood, fire, cap removal, well maintenance, or professional disinfection
Test on the event-specific schedule rather than relying on the prior annual report. After shock chlorination, NJDEP recommends a bacterial test about two weeks later to check whether the source persists.
Official guidancePrivate Well Testing Information and Recommended SchedulePrivate Well Treatment and Post-Disinfection Testing
A local ordinance or health-department instruction
The PWTA FAQ says both state and local requirements must be met and the more stringent overlapping rule applies. Confirm the local rule before ordering a package or collecting the sample.
Official guidancePrivate Well Testing Act Requirements and FAQsPrivate-Well Water Quality and Local Requirements
Laboratory and sampling
Confirm the route before collecting water.
Use a NJDEP-certified laboratory and verify current certification for every requested analyte. Certification for one method does not establish PWTA, PFAS, VOC, radiological, or other analyte scope.
Official guidancePrivate Well Testing Act Requirements and FAQsEnvironmental Laboratory Certification and Certified Laboratories
For PWTA work, a certified sample collector or authorized laboratory representative must collect the sample; pH must be collected by an employee of a laboratory certified for pH. Do not substitute a homeowner sample for the regulated route.
Official guidancePrivate Well Testing Act Requirements and FAQs
PWTA uses untreated water. Where treatment exists, collect before treatment; otherwise use the specified cold, non-aerated tap and flushing procedure. PFAS and VOC work can require field blanks and analyte-specific handling.
Official guidancePrivate Well Testing Act Requirements and FAQsPFAS Information for Private Well Users
One reporting laboratory coordinates the PWTA package and submits results electronically to NJDEP; the requesting party and local health authority also receive the regulated report.
Official guidancePrivate Well Testing Act Requirements and FAQsPWTA Statutory, Regulatory, Laboratory, and Data Resources
Official records
Search NJDEP records, then verify the local file.
NJDEP holds well permits, completion records, and decommissioning reports; the local health authority holds post-construction approvals, local requirements, and property-specific health records.
NJDEP offers DataMiner reports and an Individual Well Search Questionnaire, but a database match does not establish current water quality. Some numeric permit records require a staff request, and confidential PWTA addresses are not exposed through the public summary maps.
Open the NJDEP well search instructions ↗Records and lookup guidancePrivate Well Testing Act Requirements and FAQsWell Permitting, Records, and Search Instructions
- Well permit and permit number
- As-built well record or completion report
- Depth, casing, grout, yield, location, and driller
- PWTA, new-well, treatment, repair, and local approval records
Turn the schedule into questions
Build a starting water-test panel.
The recommender combines your current issue, purchase status, flood or repair history, nearby agriculture, vulnerable occupants, and ZIP-based New Jersey context. It does not replace the responsible professional or laboratory.
Open the Well Water Test Recommender →Official sources
These sources were reviewed for this page on 2026-09-22. A build date does not refresh that review.
- New Jersey Department of Environmental Protection: Private Well Testing Act Requirements and FAQsReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection: PWTA Statutory, Regulatory, Laboratory, and Data ResourcesReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection: New Well Sampling Requirements for Nonpublic Water SystemsReviewed 2026-09-22 · Official source updated 2023-09-01 · Recheck every 90 days
- New Jersey Department of Environmental Protection: Private Well Testing Information and Recommended ScheduleReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection: PFAS Information for Private Well UsersReviewed 2026-09-22 · Recheck every 30 days
- New Jersey Department of Environmental Protection: Arsenic in Private Well WaterReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection: Private Well Treatment and Post-Disinfection TestingReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection Office of Quality Assurance: Environmental Laboratory Certification and Certified LaboratoriesReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection: Well Permitting, Records, and Search InstructionsReviewed 2026-09-22 · Recheck every 90 days
- New Jersey Department of Environmental Protection: Private-Well Water Quality and Local RequirementsReviewed 2026-09-22 · Recheck every 90 days