Well water in Geary County, Kansas
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Testing recommended
tested well samples in Geary County exceeded the EPA limit for nitrate (10 mg/L), based on public data from USGS Water Quality Portal.
The strongest signal is arsenic: 45% of 29 local samples were above the limit, too few samples to carry the headline but first on the test list below.
735 test results across 13 contaminants from at least 44 wells, 1939 to 2018; nitrate has the most at 132. Data refreshed September 3, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
What individual samples found
Each row summarizes every public sample for that contaminant inside Geary 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 |
|---|---|---|---|---|---|---|
| Arsenic 1978 to 2018 | 29 | 86% | 8 | 30 | 10 ug/L EPA limit | |
| Nitrate 1939 to 2018 | 132 | 73% | 0.903 | 250 | 10 mg/L EPA limit | |
| Fluoride 1939 to 2018 | 100 | 98% | 0.3 | 1.1 | 4 mg/L EPA limit | |
| Copper 1977 to 2018 | 27 | 59% | 0.001 | 0.05 | 1.3 mg/L EPA limit | |
| Lead 1980 to 2018 | 25 | 32% | 0 | 1 | 15 ug/L EPA limit | |
| Iron 1939 to 2018 | no limit | 122 | 94% | 115 | 22,000 | 300 ug/L nuisance level |
| Chloride 1939 to 2018 | no limit | 107 | 100% | 35 | 599 | 250 mg/L nuisance level |
| Sodium 1939 to 2018 | no limit | 98 | 100% | 43.0 | 2,500 | 20 mg/L health guideline |
| Manganese 1947 to 2018 | no limit | 88 | 91% | 1,105 | 3,710 | 300 ug/L health guideline |
Sampled fewer than 10 times, too few to summarize: Radium (226 + 228) (4), Uranium (1), E. coli (1), Radon (1).
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 arsenic (45% of 29 samples) and nitrate (17% of 132 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.
Iron, Chloride, 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 Geary County
- 1Arsenic45% of 29 local samples were above the limit.
- 2Nitrate17% of 132 local samples were above the limit.
- 3Coliform bacteriaRecommended for every private well, every year.
- 4RadonMedian local reading is 280 pCi/L.
- 5ChlorideDetected in 100% of local samples.
- 6FluorideDetected in 98% of local samples.
- 7IronDetected in 94% of local samples.
- 8Volatile organic compounds (VOCs)252 leaking underground storage tank sites on record locally.
Test your Geary County well for arsenic, nitrate and coliform bacteria
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 Kansas: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Geary County numbers, $29. Every line explained, ranked by what matters, with the fix for each.
The rock under Geary 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.
Contamination sources on record in Geary County
KDHE records 252 leaking underground storage tank sites in Geary County, among 315 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.
- 252
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 49
- other remediation projects
- 14
- other solid waste facilities
Treatment that fits the local profile
Arsenic
Point-of-use reverse osmosis; Adsorptive media (iron-based) whole-house; Anion exchange
Nitrate
Point-of-use reverse osmosis; Anion exchange; Distillation
Iron
Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Manganese
Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
Systems we would look at first
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For arsenic
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
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.
For arsenic
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 iron
Iron and manganese oxidizing filter
whole-house, at the point of entry, about $1,800
Air-injection or greensand media; fixes staining at the source.
Free, no obligation
Get on the list for a free in-home water test in Geary County
No water treatment company serves Geary 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 Geary County, and you get an email naming it first.
Common questions
Is there arsenic in well water in Geary County?
Arsenic was detected in 86% of 29 public well samples in Geary County, and 45% 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 Geary 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 Geary 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 Kansas dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 735 samples in Geary 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.
- KDHE regulated sites: 315 regulated sites located in Geary County. Identified contaminated sites, leaking underground storage tank facilities and solid waste facilities from the Kansas Department of Health and Environment. Retrieved September 9, 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.