Water in Arkansas.
Arkansas draws heavily from rivers and reservoirs, making disinfection byproducts a consistent concern. Agricultural runoff in the east drives nitrate exposure. PFAS testing under the 2024 EPA rule is still rolling out.
How Arkansas regulates drinking water.
Federal SDWA primacy via the Arkansas Department of Health. No state-specific MCLs beyond federal. PFAS testing under the 2024 EPA rule is rolling out.
Arkansas Department of Health — Engineering Section
Arkansas's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2014
Western Arkansas TTHM exceedances trigger state-led source-water assessments.
- 2020
USGS national PFAS sampling detects compounds at multiple Arkansas systems.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Arkansas's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- lakeBeaver Lake (White River)
Northwest AR including Bentonville, Fayetteville, Springdale.
- lakeLake Maumelle + Lake Winona
Central Arkansas Water supply for Little Rock.
- riverArkansas River
Fort Smith and river corridor.
- aquiferMississippi River Alluvial Aquifer
Delta agriculture.
Source-water mix
~70% surface water, ~30% groundwater
Major cities served
Little Rock · Fort Smith · Fayetteville · Springdale
Who actually serves the water.
The largest public water systems in Arkansas by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Central Arkansas WaterLittle Rock470Kserved
- Fort Smith Utility DepartmentFort Smith130Kserved
- Beaver Water DistrictNorthwest AR500Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Arkansas's drinking water systems.
Tyson and other poultry operations drive Beaver Lake nutrient loading. Cotton and rice agriculture in the delta drives nitrate exposure. Limited heavy industry compared to neighboring states.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
Nitrate
Fertilizer and animal waste runoff. Acutely dangerous for infants under 6 months.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Risk isn't evenly distributed.
Rural agricultural communities in the Mississippi Delta face the highest combined nitrate-and-disinfection-byproduct exposure.
~16% of households on private wells, mostly in the Ozarks and rural delta.
What's coming for Arkansas's water.
Mississippi Alluvial aquifer depletion threatens delta agriculture and downstream surface flow. More intense rainfall events overwhelm treatment plants. Lake-Maumelle algal bloom risk increases with summer heat.
Voluntary statewide
Arkansas Department of Health offers voluntary technical assistance but no mandate.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Arkansas specifically.
- 1
Has my utility tested for the six federally regulated PFAS compounds?
- 2
Has Beaver Water District or my supplier reported any harmful algal bloom advisories?
- 3
What is my utility's TTHM running annual average?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
NSF/ANSI 53 carbon block for TTHMs. Reverse osmosis (NSF/ANSI 58) addresses both nitrate and PFAS.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Arkansas