New York county well guide

Well Water in Westchester County, NY: Testing, Contractors and Rules

About 17,184 households in Westchester County, 4% of the county, rely on a private well. Nobody tests that water unless the owner does.

Labs within 40 milesLicensed contractors
4%of households on a private well
Share on wells, county vs state
Westchester County4%
New York average25%
9licensed contractors serve the county
1 mito the nearest certified lab, RTCA Radon Testing Corporation of America, Inc
Nostatewide test required when a home is sold

Wells are the exception in Westchester County: about 17,184 households, under 4% of the county, are on a private well. Being in the minority means less local help, so this page gathers what applies.

Local rules for wells in Westchester County

The rules that apply in Westchester County are set at the state level in New York. The state does not require a test on a new well, and nothing is required at sale. Some counties and townships add permits or setbacks of their own, so check locally before drilling. The state's own recommendations are below.

At a glance

Water test for a new wellNot required statewide

No single statewide rule. The driller must be DEC-registered, file a preliminary notice before drilling, disinfect the finished well under NYSDOH Appendix 5-B, and send a well completion report to DEC and to you within 30 days. NYSDOH says a new well should be tested before use for coliform bacteria, nitrate, nitrite, arsenic, lead, iron, manganese, sodium, hardness, pH and turbidity. Many county health departments (Westchester, Rockland, Putnam, Dutchess, Suffolk and others) require a permit and a passing water test before a new well can be used.

Water test when a home is soldNot required statewide

No statewide requirement. A few counties and towns require a well test or well inspection when a property changes hands, and FHA, VA and USDA loans usually ask for a bacteria and nitrate test. Check with the county health department.

What the state recommends

NYSDOH recommends a coliform bacteria test every year, plus a first-time panel of nitrate, nitrite, arsenic, lead, iron, manganese, sodium, sulfate, hardness, pH, alkalinity and turbidity, then periodic re-testing of whatever showed up. Add radon, uranium, methane or PFAS where they are known in your area.

Free or low-cost testingAvailable

No statewide free program. Several county health departments run their own ELAP-certified labs and sell low-cost bacteria and nitrate tests (Erie, Monroe, Suffolk, Nassau, Cattaraugus, Chautauqua, Allegany). Others keep a list of local certified labs.

Getting your water tested near Westchester County

The nearest certified lab is RTCA Radon Testing Corporation of America, Inc in Elmsford, about 1 miles from the county center. There are 15 more within 40 miles, listed below with what each tests for.

15 certified labs within 40 miles

Licensed well contractors serving Westchester County

Licensed help in Westchester County includes Better Water Well Systems, Inc and Brightcore Energy, LLC and 7 others. Every listing was matched to the New York license list; the "verify" link on each profile opens the state lookup.

Well depth and water chemistry

Well depth and water chemistry in Westchester County follow the rock underneath it. Typical wells here run 100 to 400 ft in bedrock across most of upstate; 30 to 150 ft in glacial sand and gravel valleys and on Long Island feet. Contaminants worth testing for in this part of New York include coliform bacteria, nitrate (farm valleys and older septic areas), arsenic (parts of central and western new york), iron and manganese.

Typical well depth

Varies by location. Check the state well record search for logs of nearby wells.

Contaminants to test for
  • Coliform bacteria
  • Nitrate (farm valleys and older septic areas)
  • Arsenic (parts of central and western New York)
  • Iron and manganese
  • Hardness (limestone country)
  • Sodium and chloride (road salt)
  • Sulfate and hydrogen sulfide (shale areas)
  • Radon and uranium (Southern Tier and Adirondack bedrock)
  • Methane (Southern Tier shale)
  • PFAS (Hoosick Falls
  • Newburgh and other hot spots)
  • Barium and fluoride (western New York)

Neighboring counties: Rockland County, Putnam County, Orange County, Suffolk County.

What well work costs in Westchester County

Basic bacteria and nitrate test$25 to $75lab fee, homeowner sample
Full panel lab test$150 to $400metals, VOCs, radiologicals
Well inspection$250 to $550flow, pressure, visual, water test
Submersible pump replacement$1,200 to $4,500parts and labor
Pressure tank replacement$400 to $1,200installed
Whole-house treatment system$800 to $6,000softener, iron filter, UV, RO
New well drilled$5,500 to $25,000about $25 to $65 per foot
Shock chlorination$80 to $300or about $20 as a DIY job

National ranges from published 2025 to 2026 contractor pricing. Local quotes vary with depth, access and materials.

Questions Westchester County well owners ask

How many homes in Westchester County are on a well?

About 17,184, or 4% of households, based on Census housing data and state well surveys. The share is highest outside the towns with public water.

Where is the closest certified lab to Westchester County?

RTCA Radon Testing Corporation of America, Inc in Elmsford, about 1 miles away. Call first to ask whether they accept homeowner samples.

Do I need a permit to drill a well in Westchester County?

No single statewide rule. The driller must be DEC-registered, file a preliminary notice before drilling, disinfect the finished well under NYSDOH Appendix 5-B, and send a well completion report to DEC and to you within 30 days. NYSDOH says a new well should be tested before use for coliform bacteria, nitrate, nitrite, arsenic, lead, iron, manganese, sodium, hardness, pH and turbidity. Many county health departments (Westchester, Rockland, Putnam, Dutchess, Suffolk and others) require a permit and a passing water test before a new well can be used.

What does a well test cost near Westchester County?

A bacteria and nitrate test runs $25 to $75 at most certified labs; a full panel with metals is $150 to $400. Mail-in kits cost about the same as walking in.