Well water in Underhill, Vermont
In Underhill, 2% of 374 private wells tested had nitrate above the Vermont limit (10 mg/L), according to the Vermont Department of Health.
392 private wells tested in state summaries; 14 test results across 7 contaminants from at least 2 wells, 2003; copper has the most at 2. Data refreshed September 3, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
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.
| Contaminant | Above state level | Wells tested | Median | 95th pct | Highest | State level |
|---|---|---|---|---|---|---|
| Nitrate | 374 | 0.25 | 2.6 | 18.7 | 10 mg/L | |
| Gross alpha Gross Alpha | 208 | 1.4 | 10.8 | 27.2 | 15 pCi/L | |
| Fluoride | 392 | 0.11 | 0.18 | 1.26 | 4 mg/L | |
| Arsenic | 325 | * | * | 4 | 10 ug/L | |
| Uranium | 317 | * | 3 | 11 | 20 ug/L | |
| Radon | 21 | 1,090 | 2,400 | 3,360 | 4,000 pCi/L |
* suppressed by the publisher because too few wells were tested.
Closer than the town
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 Underhill who sent a sample to the state lab, the health-based limits most often exceeded were nitrate (2% of 374 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.
What to test for in Underhill
- 1Nitrate2% of 374 local wells tested were above the Vermont limit.
- 2Coliform bacteriaRecommended for every private well, every year.
- 3Gross alpha2% of 208 local wells tested were above the Vermont limit.
- 4ManganeseDetected in 100% of local samples.
- 5Volatile organic compounds (VOCs)12 leaking underground storage tank sites on record locally.
- 6PFAS1 unlined landfill on record locally.
Test your Underhill well for nitrate, coliform bacteria and gross alpha
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.
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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 Underhill numbers, $29. Every line explained, ranked by what matters, with the fix for each.
Wells in Underhill
395 domestic wells in Underhill are on record with the state since 1996. 96% are drilled into bedrock, and the typical well is 350 feet deep (one in ten goes past 604 feet).
In a typical Underhill well, bedrock starts about 30 feet down, the median yield is 9 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 Underhill
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 town 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 Underhill
Vermont ANR records 12 leaking underground storage tank sites and 1 unlined landfill in Underhill, among 20 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.
- 12
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 1
- unlined landfillOlder unlined landfills are a leading source of PFAS, VOCs and metals in nearby wells.
- 7
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
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Get on the list for a free in-home water test in Underhill
No water treatment company serves Underhill 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 Underhill, and you get an email naming it first.
Common questions
How deep are wells in Underhill?
The typical domestic well in Underhill is 350 feet deep, based on 395 wells reported to the state since 1996. One in ten is deeper than 604 feet. 96% are drilled into bedrock.
How often should I test a private well in Underhill?
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 near Underhill
Closest first. Groundwater does not stop at a line on a map, so the next town 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: 14 samples in Underhill. 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 Underhill, up to 392 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.
- Vermont ANR well completion reports: 400 well records in Underhill, 395 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: 20 regulated sites located in Underhill. 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.