Well water in Eddy County, New Mexico
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Testing strongly recommended
tested well samples in Eddy County exceeded the EPA limit for radium (226 + 228) (5 pCi/L), based on public data from USGS Water Quality Portal.
2,527 test results across 14 contaminants from at least 460 wells, 1927 to 2025; chloride has the most at 1,132. Data refreshed September 15, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
An estimated 2,308 people in Eddy County get their drinking water from a private well, per USGS 2015 county water use. That is about 4% of residents.
Separately, the USGS national arsenic model estimates that 3% of the 2,308 people on private wells in Eddy County draw water above 10 ug/L (the model's range is 2% to 4%), from geology and well depth rather than local tests.
What individual samples found
Each row summarizes every public sample for that contaminant inside Eddy County. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.
| Contaminant | Above limit | Samples | Detected | Median | Highest | Limit |
|---|---|---|---|---|---|---|
| Radium (226 + 228) 1975 to 1980 | 65 | 94% | 17 | 510 | 5 pCi/L EPA limit | |
| Lead 1975 to 2024 | 94 | 90% | 0.51 | 340,000 | 15 ug/L EPA limit | |
| Copper 1975 to 2024 | 93 | 96% | 0.012 | 190 | 1.3 mg/L EPA limit | |
| Arsenic 1975 to 2024 | 92 | 88% | 1 | 220 | 10 ug/L EPA limit | |
| Nitrate 1927 to 2025 | 328 | 99% | 1.17 | 564 | 10 mg/L EPA limit | |
| Fluoride 1927 to 2025 | 183 | 98% | 1 | 158 | 4 mg/L EPA limit | |
| Uranium 1975 to 2024 | 86 | 91% | 1.48 | 34 | 30 ug/L EPA limit | |
| Chloride 1927 to 2025 | no limit | 1,132 | 100% | 234 | 290,000 | 250 mg/L nuisance level |
| Sodium 1927 to 2025 | no limit | 166 | 99% | 654 | 130,000 | 20 mg/L health guideline |
| Iron 1927 to 2025 | no limit | 154 | 83% | 320 | 6,100,000 | 300 ug/L nuisance level |
| Manganese 1971 to 2024 | no limit | 121 | 84% | 380 | 340,000 | 300 ug/L health guideline |
Sampled fewer than 10 times, too few to summarize: PFOS (6), PFOA (6), Radon (1).
Over time
Share of samples above the limit by period. A cell needs ten samples to show; a comparison needs twenty in each period. Later periods sample fewer wells, and often the ones already known to have a problem.
| Contaminant | before 2000 | 2000s | 2010s | 2020s |
|---|---|---|---|---|
| Fluoride | 6%162 samples | n/a | n/a | 0%21 samples |
| Lead | 53%79 samples | n/a | n/a | 0%15 samples |
| Copper | 16%79 samples | n/a | n/a | 0%14 samples |
| Arsenic | 16%74 samples | n/a | n/a | 0%18 samples |
| Uranium | 1%68 samples | n/a | n/a | 0%18 samples |
Fluoride above the limit in Eddy County fell from 6% of 162 samples before 2000 to 0% of 21 in the 2020s.
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
The contaminants most often above their limit here are radium (226 + 228) (75% of 65 samples), lead (45% of 94 samples), and copper (14% of 93 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.
Chloride, Iron, and Manganese are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Eddy County
- 1Radium (226 + 228)75% of 65 local samples were above the limit.
- 2Lead45% of 94 local samples were above the limit.
- 3Copper14% of 93 local samples were above the limit.
- 4Arsenic13% of 92 local samples were above the limit.
- 5Nitrate13% of 328 local samples were above the limit.
- 6Fluoride5% of 183 local samples were above the limit.
- 7Uranium1% of 86 local samples were above the limit.
Test your Eddy County well for radium (226 + 228), lead and copper
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.
Affiliate links: the merchant pays us a commission and the price is the same for you. It does not change what the data above says. As an Amazon Associate we earn from qualifying purchases.
Where to get a well tested in New Mexico: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Eddy County numbers, $29. Every line explained, ranked by what matters, with the fix for each.
The rock under Eddy 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 New Mexico
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.
- Private Wells, NMED
- Laboratory Certification, NMED
Contamination sources on record in Eddy County
NMED storage tank facilities and landfills records 61 regulated sites in Eddy County, among 61 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.
- 60
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
- 1
- lined landfill or transfer facility
Treatment that fits the local profile
Radium (226 + 228)
Water softener (cation exchange); Point-of-use reverse osmosis
Lead
Point-of-use reverse osmosis; Certified lead-removal carbon filter; Neutralizing filter to raise pH and stop leaching
Copper
Neutralizing filter to raise pH; Point-of-use reverse osmosis
Arsenic
Point-of-use reverse osmosis; Adsorptive media (iron-based) whole-house; Anion exchange
Nitrate
Point-of-use reverse osmosis; Anion exchange; Distillation
Systems we would look at first
Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For radium (226 + 228)
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For lead
Aquasana SmartFlow reverse osmosis
under-sink or countertop, about $225
Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.
For lead
Acid neutralizing filter
whole-house, at the point of entry, about $1,200
Raises pH so plumbing stops leaching lead and copper.
For lead
Aquasana Claryum 3-Stage under-sink filter
under-sink or countertop, about $175
Certified to NSF/ANSI 53 to reduce 99% of lead and 99.7% of PFOA and PFOS at the tap. Not a fix for arsenic, nitrate or bacteria.
For arsenic
Whole-house arsenic and uranium filter
whole-house, at the point of entry, about $2,500
Adsorptive iron-based media; sized to your well yield.
Free, no obligation
Get on the list for a free in-home water test in Eddy County
No water treatment company serves Eddy 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 Eddy County, and you get an email naming it first.
Common questions
Is there arsenic in well water in Eddy County?
Arsenic was detected in 88% of 92 public well samples in Eddy County, and 13% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.
How often should I test a private well in Eddy 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.
Counties near Eddy 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 New Mexico dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 2,527 samples in Eddy 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.
- USGS national arsenic model (Ayotte 2017): estimated share of 2,308 people on private wells in Eddy 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.
- NMED storage tank facilities and landfills: 61 regulated sites located in Eddy County. Underground storage tank facilities and permitted landfills from the New Mexico Environment Department. Retrieved September 18, 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.