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privatewelldata / States / New Jersey

New Jersey well water testing

2 labs are listed on New Jersey’s official certified-lab list; 2% of 2,225 sampled wells were above the arsenic limit across 20 counties. Updated 2026-10-18.

Official lab list for New Jersey

NJDEP Data Miner – certified drinking water labsNew Jersey's environmental agency lets you run a live report of labs certified for drinking water. Pick the certified-laboratory report in Data Miner.njems.nj.gov · checked 2026-10-18New Jersey Department of Environmental ProtectionThis state agency certifies the labs that may test drinking water. Use its list to pick a certified lab for your well sample.njems.nj.gov · checked 2026-10-18 · link via EPA

Coverage map

Map of New Jersey: 2 listed labs open to private wells shown as dots, and 20 counties shaded by the share of sampled wells above the arsenic limit.
● 2 listed labs open to private wells (placed by town or postal code). Counties shaded by share of sampled wells above 10 µg/L arsenic: 0 1–5% 5–10% 10–25% 25–50% 50%+ grey = no data. Sources: New Jersey DEP; USGS/EPA Water Quality Portal; US Census boundaries · privatewelldata.com

Where the labs are

Listed labs by town. Source: New Jersey DEP · privatewelldata.com
TownLabs
Cinnaminson1
Union1

Well water results by county

20 rows

Share of sampled wells above the EPA limit. Source: USGS/EPA Water Quality Portal · privatewelldata.com
CountyArsenic > 10 µg/LNitrate > 10 mg/L
Atlantic County1% of 1714% of 301
Bergen County2% of 501% of 144
Burlington County1% of 1641% of 304
Camden County1% of 1562% of 286
Cape May County0% of 682% of 122
Cumberland County1% of 13419% of 175
Essex County0% of 200% of 36
Gloucester County6% of 3055% of 483
Hunterdon County10% of 1140% of 129
Mercer County4% of 929% of 147
Middlesex County1% of 1114% of 289
Monmouth County0% of 561% of 164
Morris County2% of 3200% of 381
Ocean County1% of 1542% of 453
Passaic County0% of 300% of 43
Salem County0% of 8720% of 181
Somerset County5% of 382% of 44
Sussex County2% of 811% of 130
Union County0% of 120% of 27
Warren County0% of 624% of 75

Nitrate: 4% of 3,914 sampled wells statewide. All New Jersey counties →

Labs on the New Jersey DEP list

See all 2 New Jersey lab listings →

How to choose a lab

  1. Pick a lab on the official list above that is certified for each test you need (bacteria and chemistry are often separate certifications).
  2. Ask for the lab’s own sample bottles and instructions; bacteria samples usually must reach the lab within 24–30 hours.
  3. Compare prices for a basic package (bacteria, nitrate, pH/TDS) and add arsenic or other metals where local data shows a risk.
  4. Be wary of free in-home tests from treatment-system sellers — see our salesperson checklist.

Based on CDC and EPA private-well guidance.

Questions

Where can I get my well water tested in New Jersey?

Use a lab on New Jersey’s official certified-lab list. We count 2 listed labs (excluding those marked as serving public water systems only), most in Cinnaminson, Union. Confirm the lab is certified for the exact tests you need before you send a sample.

What should I test my well for in New Jersey?

Test every year for bacteria (total coliform and E. coli), nitrate, pH and total dissolved solids (CDC). In New Jersey, 2% of sampled wells with arsenic data were above the EPA limit, so include arsenic. Use our test helper for a list that fits your home.

Is there well water data for my county in New Jersey?

Yes for 20 counties: we show the share of sampled wells above the EPA arsenic and nitrate limits, from the Water Quality Portal (USGS/EPA). These are monitoring wells as well as private wells, so test your own well.

Get a test list for your home → · If a result is high