Well water in Lamoille County, Vermont
In Lamoille County, 3% of 1,625 private wells tested had arsenic above the Vermont limit (10 ug/L), according to the Vermont Department of Health.
1,924 private wells tested in state summaries; 6 test results across 6 contaminants from at least 1 wells, 1966; nitrate has the most at 1. Data refreshed September 15, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
An estimated 12,024 people in Lamoille County get their drinking water from a private well, per USGS 2015 county water use. That is about 48% of residents.
Separately, the USGS national arsenic model estimates that 2% of the 12,024 people on private wells in Lamoille County draw water above 10 ug/L (the model's range is 1% to 3%), from geology and well depth rather than local tests.
What homeowner tests found
Vermont Tracking private well summaries: private wells tested and reported to the state. Shares are against the level the state applies to each contaminant, named in the last column; several are stricter than EPA. County and state figures combine the town summaries, weighted by wells tested; medians are not combined.
Closer than the county
See the sampled wells near your address
The same records, drawn around one point: which wells within a few miles were sampled and what they found, how deep the wells next to you were drilled, and any leaking tank or cleanup site within a mile.
Check my addressWhat this means
Among homeowners in Lamoille County who sent a sample to the state lab, the health-based limits most often exceeded were arsenic (3% of 1,625 wells), uranium (<1% of 1,218 wells), and nitrate (<1% of 1,924 wells). These are ordinary wells tested by their owners, so the shares are the best available picture of a typical well here, with one caveat: people test more often when they suspect a problem.
Radon was above the Vermont advisory level of 4,000 pCi/L in 6% of 421 wells. Radon in water matters because it moves into indoor air during showers and laundry.
What to test for in Lamoille County
- 1Arsenic3% of 1,625 local wells tested were above the Vermont limit.
- 2Uranium<1% of 1,218 local wells tested were above the Vermont limit.
- 3Nitrate<1% of 1,924 local wells tested were above the Vermont limit.
- 4Coliform bacteriaRecommended for every private well, every year.
- 5Radon6% of 421 local wells tested were above the Vermont advisory level.
- 6Gross alpha5% of 890 local wells tested were above the Vermont limit.
- 7FluorideDetected in 100% of local samples.
- 8ChlorideDetected in 100% of local samples.
- 9Volatile organic compounds (VOCs)212 leaking underground storage tank sites on record locally.
- 10PFAS5 unlined landfills on record locally.
- 11Metals panel38 hazardous waste sites on record locally.
Test your Lamoille County well for arsenic, uranium and nitrate
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
Just want bacteria checked first? Tap Score coliform and E. coli test, $99. Coliform and E. coli are the tests every well needs every year.
Want a quick look before paying for a lab? Home well water test strips on Amazon check hardness, iron, pH and nitrate in minutes. They are a screen, not a result: arsenic, bacteria, uranium and PFAS need a certified lab.
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Where to get a well tested in Vermont: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Lamoille County numbers, $29. Every line explained, ranked by what matters, with the fix for each.
Wells in Lamoille County
3,481 domestic wells in Lamoille County are on record with the state since 1973. 98% are drilled into bedrock, and the typical well is 299 feet deep (one in ten goes past 520 feet).
In a typical Lamoille County well, bedrock starts about 25 feet down, the median yield is 8 gallons per minute, 20% of wells yield under 3 gallons per minute and usually need a storage tank.
Bedrock wells are where arsenic, uranium and radon come from: the water sits in fractures in granite and metamorphic rock and picks up whatever the rock carries. That is why testing for those three matters more here than in a dug or gravel well.
The rock under Lamoille County
Not a principal aquifer
The USGS map places this area outside any principal aquifer, which usually means wells here draw from fractured bedrock or thin local deposits rather than a large regional aquifer. Bedrock wells of that kind are where arsenic, radon and uranium turn up, and yields vary from well to well.
Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the county centroid. A single well can sit in a different unit, especially near a boundary.
Official help in Vermont
Two places to start that are not selling anything: the state program that answers private well questions, and its list of labs certified to run drinking water tests. A certified lab is the difference between a result you can act on and a number.
- Drinking Water, Vermont Department of Health
- Certification Programs for Other Labs, Vermont Department of Health
Contamination sources on record in Lamoille County
Vermont ANR records 212 leaking underground storage tank sites, 5 unlined landfills, 38 hazardous waste sites, and 6 reported spills and releases in Lamoille County, among 362 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.
- 212
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 5
- unlined landfillsOlder unlined landfills are a leading source of PFAS, VOCs and metals in nearby wells.
- 38
- hazardous waste sitesSolvents, degreasers and metals from industrial sites can travel far in fractured bedrock.
- 6
- reported spills and releasesMost spills are fuel; a few are solvents or chemicals that reach the water table.
- 101
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
Treatment that fits the local profile
Radon
Aeration (bubble-up or diffused) whole-house; Granular activated carbon whole-house (lower levels only)
Gross alpha
Point-of-use reverse osmosis; Water softener (cation exchange) for radium; Anion exchange for uranium
Systems we would look at first
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For gross alpha
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
Free, no obligation
Get on the list for a free in-home water test in Lamoille County
No water treatment company serves Lamoille County through Well Water Nerd yet. We are signing licensed companies on county by county: they test at your tap for free, walk you through the numbers, and quote treatment only if something needs fixing. Leave your details and you are first in line. Nothing is shared until a company joins for Lamoille County, and you get an email naming it first.
Common questions
How deep are wells in Lamoille County?
The typical domestic well in Lamoille County is 299 feet deep, based on 3,481 wells reported to the state since 1973. One in ten is deeper than 520 feet. 98% are drilled into bedrock.
How often should I test a private well in Lamoille County?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Towns in Lamoille County
Counties near Lamoille County
Closest first. Groundwater does not stop at a line on a map, so the next county over is a fair second opinion.
Want the numbers themselves? Download the Vermont dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 6 samples in Lamoille County. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
- Vermont Tracking private well summaries: summaries for 6 contaminants in Lamoille County, up to 1,924 wells each. Town summaries of private well tests reported to the Vermont Department of Health, published through Vermont Environmental Public Health Tracking. Shares are against the limit Vermont applies to each analyte: arsenic 10 ug/L, uranium 20 ug/L (stricter than EPA), fluoride 4 mg/L, nitrate 10 mg/L, gross alpha 15 pCi/L, radon 4,000 pCi/L advisory. Only towns with 20 or more results are published; statistics below the reporting limit show as *. Retrieved September 3, 2026.
- USGS national arsenic model (Ayotte 2017): estimated share of 12,024 people on private wells in Lamoille County above 10 ug/L of arsenic, from geology, well depth and land use. County estimates of domestic well users with arsenic above 10 ug/L from the USGS national logistic regression model (Ayotte, Medalie and Qi, 2017), with private well population from the USGS 2015 county water-use compilation (Dieter and others, 2018). Retrieved September 15, 2026.
- Vermont ANR well completion reports: 3,646 well records in Lamoille County, 3,481 domestic. Well completion reports filed with the Vermont Agency of Natural Resources since 1966. Only aggregates are shown; owner names and addresses are never stored. Retrieved September 3, 2026.
- Vermont ANR regulated sites: 362 regulated sites located in Lamoille County. Hazardous waste sites, landfills and underground storage tanks from the Vermont Agency of Natural Resources. Retrieved September 3, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.