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privatewelldata / States / New York

New York well water testing

1 labs are listed on New York’s official certified-lab list; 2% of 2,654 sampled wells were above the arsenic limit across 58 counties. Updated 2026-10-18.

Official lab list for New York

New York ELAP – search accredited environmental labsUse New York's ELAP search to check which labs are accredited for drinking water. Search by lab name, category or test method.apps.health.ny.gov · checked 2026-10-18 (search)New York State Department of HealthThis state agency certifies the labs that may test drinking water. Use its list to pick a certified lab for your well sample.apps.health.ny.gov · checked 2026-10-18 · link via EPA

Coverage map

Map of New York: 1 listed labs open to private wells shown as dots, and 58 counties shaded by the share of sampled wells above the arsenic limit.
● 1 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: official state list; USGS/EPA Water Quality Portal; US Census boundaries · privatewelldata.com

Where the labs are

Listed labs by town. Source: official state list · privatewelldata.com
TownLabs
Carle Place1

Well water results by county

58 rows · showing 1–25

Share of sampled wells above the EPA limit. Source: USGS/EPA Water Quality Portal · privatewelldata.com
CountyArsenic > 10 µg/LNitrate > 10 mg/L
Albany County0% of 272% of 66
Allegany County19% of 320% of 65
Broome County5% of 410% of 63
Cattaraugus County0% of 330% of 78
Cayuga County0% of 170% of 28
Chautauqua County3% of 290% of 52
Chemung County0% of 100% of 40
Chenango County5% of 210% of 24
Clinton County0% of 260% of 59
Columbia County0% of 140% of 20
Cortland County0% of 271% of 112
Delaware County0% of 370% of 48
Dutchess County0% of 360% of 39
Erie County3% of 792% of 101
Essex County0% of 390% of 53
Franklin County0% of 180% of 22
Fulton County0% of 150% of 15
Genesee County0% of 194% of 26
Greene County9% of 110% of 39
Hamilton County0% of 170% of 24
Herkimer County0% of 250% of 59
Jefferson County0% of 340% of 61
Kings County0% of 7331% of 93
Lewis County0% of 240% of 34
Livingston County5% of 213% of 30
Madison County0% of 220% of 26
Monroe County18% of 280% of 60
Montgomery County0% of 159% of 57
Nassau County0% of 8889% of 1,663
New York County0% of 260% of 26
Oneida County8% of 381% of 75
Onondaga County4% of 270% of 53
Ontario County0% of 200% of 43
Orange County0% of 480% of 110
Oswego County17% of 422% of 59
Otsego County0% of 180% of 30
Putnam County0% of 230% of 30
Queens County0% of 1538% of 194
Rensselaer County7% of 150% of 18
Richmond County0% of 234% of 23
Rockland County–0% of 15
Saratoga County6% of 691% of 72
Schenectady County0% of 322% of 43
Schoharie County0% of 190% of 21
Schuyler County–0% of 17
Seneca County0% of 100% of 27
St. Lawrence County0% of 483% of 78
Steuben County5% of 211% of 76
Sullivan County3% of 300% of 36
Tioga County15% of 200% of 26
Tompkins County4% of 720% of 93
Ulster County6% of 680% of 69
Warren County0% of 300% of 33
Washington County0% of 234% of 23
Wayne County6% of 170% of 37
Westchester County6% of 660% of 119
Wyoming County0% of 180% of 29
Yates County–0% of 23

Nitrate: 5% of 4,555 sampled wells statewide. All New York counties →

See all 1 New York 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 York?

Use a lab on New York’s official certified-lab list. We count 1 listed labs (excluding those marked as serving public water systems only), most in Carle Place. 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 York?

Test every year for bacteria (total coliform and E. coli), nitrate, pH and total dissolved solids (CDC). In New York, 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 York?

Yes for 58 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