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Arkansas Water Quality
501
Utilities in database
3.0M
Residents served
32%
On private wells
2
Key contaminants tracked
Drinking Water in Arkansas
Arkansas has 501 community water systems serving approximately 3.0 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, nitrates. 32% of Arkansas residents rely on private wells. ADH holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Arkansas
326–350 of 501Hazen Waterworks
AR0000452 · 1,301 served
Oppelo Water Department
AR0000120 · 1,300 served
Diamond City Water
AR0000061 · 1,290 served
Horatio Waterworks
AR0000518 · 1,278 served
Fordyce Rural Water Assoc
AR0000635 · 1,274 served
Central Logan County Pwfb
AR0000845 · 1,268 served
Brunner Hill Water Assoc
AR0000837 · 1,265 served
Oxford Waterworks
AR0000259 · 1,253 served
Cotter Waterworks
AR0000028 · 1,233 served
Elaine Waterworks
AR0000418 · 1,233 served
Central City Water Department
AR0000503 · 1,227 served
Breckenridge Union Water Assoc
AR0000223 · 1,225 served
River Valley Water Assn
AR0000833 · 1,207 served
Ola Waterworks
AR0000604 · 1,204 served
Old Union Public Water Authority
AR0000559 · 1,200 served
Omaha Waterworks
AR0000064 · 1,188 served
Ash Flat Water Company
AR0000527 · 1,186 served
Walker Water Association
AR0000116 · 1,182 served
Bradley Co Rural Water Association
AR0000054 · 1,163 served
Emerson Waterworks
AR0000111 · 1,145 served
New Hope Water Association
AR0000683 · 1,136 served
Locke-fern Dollard Rd Ww Pfb
AR0000912 · 1,135 served
Strong Waterworks
AR0000556 · 1,131 served
Norphlet Waterworks
AR0000554 · 1,112 served
Lawson-urbana Water Assoc
AR0000548 · 1,108 served
Key Contaminant Concerns in Arkansas
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Arkansas Water FAQs
Quick Links
Data source: Utility data from EPA SDWIS. 501 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22