Well water in Sedgwick County, Colorado
In Sedgwick County, iron was detected in 74% of 31 tested well samples from USGS Water Quality Portal.
The strongest signal is uranium: 50% of 10 local samples were above the limit, too few samples to carry the headline but first on the test list below.
146 test results across 12 contaminants from at least 16 wells, 1948 to 2023; iron has the most at 31. Data refreshed September 15, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
An estimated 439 people in Sedgwick County get their drinking water from a private well, per USGS 2015 county water use. That is about 18% of residents.
Separately, the USGS national arsenic model estimates that 5% of the 439 people on private wells in Sedgwick County draw water above 10 ug/L (the model's range is 4% to 6%), from geology and well depth rather than local tests.
What individual samples found
Each row summarizes every public sample for that contaminant inside Sedgwick 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 |
|---|---|---|---|---|---|---|
| Uranium 1994 to 2023 | 10 | 90% | 30.8 | 57.2 | 30 ug/L EPA limit | |
| Nitrate 1984 to 2023 | 15 | 100% | 4.1 | 24 | 10 mg/L EPA limit | |
| Fluoride 1964 to 2023 | 25 | 100% | 0.6 | 1.5 | 4 mg/L EPA limit | |
| Iron 1948 to 2023 | no limit | 31 | 74% | 0 | 170 | 300 ug/L nuisance level |
| Sodium 1964 to 2023 | no limit | 25 | 100% | 176 | 264 | 20 mg/L health guideline |
| Manganese 1984 to 2023 | no limit | 12 | 50% | 0 | 13.8 | 300 ug/L health guideline |
Sampled fewer than 10 times, too few to summarize: Copper (8), Lead (8), Arsenic (8), PFOA (1), PFOS (1), Radon (2).
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 uranium (50% of 10 samples) and nitrate (20% of 15 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 is widespread in local groundwater. It is mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Sedgwick County
- 1Uranium50% of 10 local samples were above the limit.
- 2Nitrate20% of 15 local samples were above the limit.
- 3Coliform bacteriaRecommended for every private well, every year.
- 4RadonMedian local reading is 785 pCi/L.
- 5FluorideDetected in 100% of local samples.
- 6CopperDetected in 75% of local samples.
- 7IronDetected in 74% of local samples.
Test your Sedgwick County well for uranium, 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 Colorado: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Sedgwick County numbers, $29. Every line explained, ranked by what matters, with the fix for each.
The rock under Sedgwick County
High Plains aquifer
Unconsolidated sand and gravel. Wells in sand and gravel are usually shallow and productive, and they recharge quickly from the surface. That makes them the most exposed to nitrate, bacteria and anything spilled nearby, and the least likely to carry arsenic or radon from the rock.
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 Colorado
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.
Contamination sources on record in Sedgwick County
CDPHE operating landfills records 1 regulated sites in Sedgwick County, among 1 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.
- 1
- lined landfill or transfer facility
Treatment that fits the local profile
Uranium
Point-of-use reverse osmosis; Anion exchange; 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 uranium
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For uranium
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 nitrate
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.
Free, no obligation
Get on the list for a free in-home water test in Sedgwick County
No water treatment company serves Sedgwick 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 Sedgwick County, and you get an email naming it first.
Common questions
How often should I test a private well in Sedgwick 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 Sedgwick 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 Colorado dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 146 samples in Sedgwick 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 439 people on private wells in Sedgwick 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.
- CDPHE operating landfills: 1 regulated sites located in Sedgwick County. Operating commercial landfills from the Colorado Department of Public Health and Environment. 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.