Arsenic in Drinking Water in Kansas
What residents of Kansas need to know about arsenic in drinking water — including natural geological sources, private well risk, which utilities have documented violations, and how to remove arsenic from tap water.
Source: EPA SDWIS, Kansas Department of Health and Environment, USGS · Last reviewed: 2025-01-01
Quick Answer
Is arsenic in drinking water a concern in Kansas?
Yes. Kansas has documented arsenic in the Ogallala Aquifer (High Plains Aquifer) in western Kansas and in some alluvial aquifer systems. The Ogallala — which supplies irrigation and drinking water across western Kansas — has naturally occurring arsenic from the sedimentary geology of the High Plains. Multiple western Kansas public water systems have historically required treatment for arsenic compliance.
Where does arsenic come from in Kansas's water?
The Ogallala (High Plains) Aquifer underlies western Kansas and contains naturally occurring arsenic from the sedimentary geology of the Great Plains. Communities in western Kansas drawing entirely from the Ogallala face the highest documented arsenic risk. The Arkansas River alluvial aquifer in south-central Kansas also has documented arsenic from naturally occurring sources.
What should Kansas residents know?
Western Kansas communities in Finney, Kearny, Hamilton, Stanton, Grant, Haskell, and other High Plains counties relying on the Ogallala Aquifer face the highest arsenic risk. Kansas KDHE has been working with affected communities on treatment compliance. Private well owners in western Kansas should test for arsenic, as the Ogallala serves both public and private water supplies across the region.
Key Facts
| EPA MCL | 10 µg/L (10 ppb) |
| MCLG | Zero |
| Primary source | Ogallala (High Plains) Aquifer — naturally occurring arsenic in Great Plains sedimentary geology |
| Highest-risk region | Western Kansas High Plains counties — Finney, Kearny, Hamilton, Stanton, Grant, Haskell |
| State regulator | Kansas Department of Health and Environment (KDHE) |
| Health effects | Bladder, lung, skin cancer; cardiovascular; diabetes risk |
| Effective treatment | Reverse osmosis or activated alumina — both in use at Kansas community water systems |
Why Arsenic Matters in Kansas
Kansas's arsenic problem in western counties is a direct function of Ogallala Aquifer geology. The High Plains Aquifer — formed from sediments eroded off the Rocky Mountains — contains arsenic in fine-grained sedimentary layers that leach into groundwater. Multiple communities in southwest and west-central Kansas have exceeded the MCL and required treatment installation. The Ogallala also supplies irrigation water throughout western Kansas, and as groundwater levels decline due to over-extraction, the geochemical conditions affecting arsenic mobilization can change.
Kansas Arsenic Program
Kansas KDHE monitors arsenic under federal SDWIS. The High Plains (Ogallala) Aquifer that underlies western Kansas has documented arsenic in some areas. Private well owners in western Kansas drawing from the Ogallala should test for arsenic as part of routine well testing.
Largest Kansas Water Utilities
No arsenic violations on record in EPA SDWIS for Kansas utilities in our database. Browse the largest utilities to review their full water quality record.
How Does Arsenic Get Into Drinking Water?
Arsenic in drinking water is almost always naturally occurring — it leaches from arsenic-bearing rocks and minerals into groundwater over time. New England granite, Southwest volcanic geology, and Upper Midwest glacial aquifers are the primary high-risk formations. It has no taste, odor, or color.
Full arsenic overview — geology maps, health effects, all 50 statesWho Should Pay Closest Attention
Communities in the Kansas High Plains counties — Finney, Kearny, Hamilton, Stanton, Grant, Haskell, Meade, Seward, and Morton counties — relying on Ogallala Aquifer groundwater face the highest documented risk. Private irrigation well owners in these counties who also use their wells for domestic supply should test.
Private well owners near mining districts or agricultural areas
Residents in states with documented volcanic or geothermal geology
Long-term consumers of water from small groundwater systems
Households in homes built before 1960 with older well casings
Residents whose well water has never been tested for arsenic
Anyone living in a state where bedrock wells are common
How to Check Your Situation in Kansas
- 1
Identify your water source. If you use a public utility, use the ZIP lookup on this page to find your system and check its compliance record.
- 2
If on public water, review your utility's most recent Consumer Confidence Report (CCR) for arsenic monitoring data. The MCL is 10 ppb — your report should show recent test results.
- 3
If on a private well, order an arsenic test from a Kansas Department of Health and Environment-certified laboratory. A basic arsenic test costs $15–$40. The state agency website maintains a certified lab list.
- 4
Test your well at the tap — not just at the wellhead. The entire water distribution system within your home can affect water quality.
- 5
If your test shows arsenic above 5 ppb, install certified treatment immediately. If above 10 ppb, do not use the water for drinking or cooking until treatment is installed.
- 6
Retest after installing treatment to confirm it is working as certified. Replace filter media on the manufacturer's schedule — an exhausted filter may not perform as rated.
Treatment Options for Arsenic
Boiling does not remove arsenic — it concentrates it. Standard activated carbon filters (Brita, etc.) do not effectively remove arsenic. Certified treatment is required.
NSF/ANSI Standard 58 — Reverse Osmosis
RO systems certified to NSF/ANSI 58 remove 85–95% of arsenic. Under-sink installation. Most effective for removing multiple contaminants simultaneously. Replace membranes and pre-filters on schedule.
Activated Alumina Filters
Activated alumina is specifically designed for arsenic and fluoride removal. Point-of-use or whole-house options available. Must be certified by NSF International or WQA for arsenic reduction. Requires periodic media regeneration or replacement.
Iron/Manganese Oxidation Filters
Effective for arsenic in iron-rich well water, which is common in the Midwest and New England. Oxidation converts dissolved iron and arsenic to a form that can be filtered out. Best when arsenic is co-occurring with high iron levels.
What does NOT work for arsenic
Standard activated carbon filters (Brita, refrigerator filters, most pitcher filters) do NOT effectively remove arsenic. Boiling concentrates arsenic. Water softeners do not remove arsenic. Only use products with NSF certification specifically for arsenic reduction.
Take Action Now
If you use a private well in Kansas, test for arsenic — especially if you are in a region with granite, volcanic, or sedimentary geology. A basic arsenic test costs $15–$40 at a state-certified lab.
Public water users: check your utility's Consumer Confidence Report (CCR) for arsenic results. The EPA MCL is 10 ppb — any detection warrants attention.
If arsenic is detected above 10 ppb (or even below it, given MCLG is zero), install an NSF/ANSI 58-certified reverse osmosis system for drinking and cooking water.
Standard carbon filters do NOT remove arsenic — do not rely on a Brita or refrigerator filter for arsenic protection.
Frequently Asked Questions
Related Pages
Arsenic — National Overview
All U.S. utilities with arsenic records
Kansas State Overview
All utilities and water quality data
Kansas Well Water Guide
Testing, risks & certified labs for private wells
Reverse Osmosis Guide
Removes 85–95% of arsenic
Best Arsenic Filter Guide
What actually works (carbon doesn't)
PFAS in Drinking Water
The 'forever chemical' contamination overview
All Contaminants
Complete reference library
Data Sources & Provenance
All data on this page is sourced from official U.S. government or public datasets.
Find Your Utility
State Regulator
Kansas Department of Health and Environment ↗