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Mississippi Water Quality
794
Utilities in database
3.1M
Residents served
30%
On private wells
3
Key contaminants tracked
Drinking Water in Mississippi
Mississippi has 794 community water systems serving approximately 3.1 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead, nitrates. 30% of Mississippi residents rely on private wells. MDEQ holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Mississippi
701–725 of 794Humphreys Co. W/a #3-jaketown
MS0270019 · 731 served
Big Creek Water Association
MS0070002 · 731 served
Town of Anguilla
MS0630001 · 729 served
City of Horn Lake - Holly Hills
MS0170024 · 729 served
Sylvarena Water Association
MS0650010 · 721 served
North Hinds W/a #5-limekiln
MS0250011 · 715 served
Cumberland Water Assn
MS0780003 · 715 served
West Tallahatchie Utl Assn
MS0680013 · 713 served
Houston Estates Utility-palmetto Pointe
MS0300162 · 713 served
Foxworth Water & Sewerage Assn
MS0460005 · 710 served
Mcadams Water Association
MS0040005 · 708 served
Town of Isola
MS0270003 · 700 served
North District 1 Water Assn.
MS0490006 · 700 served
Atlanta Water System, Inc.
MS0090001 · 700 served
Coles Water Association #1
MS0030001 · 694 served
West Harrison Water & Sewer District
MS0240277 · 689 served
Town of Crowder
MS0600003 · 682 served
Poor House W/a #2
MS0220013 · 678 served
Town of Utica
MS0250026 · 673 served
Panola-union W/a
MS0540015 · 668 served
Mud Creek Water Association #2
MS0580020 · 663 served
Mccarley Water Association, Inc
MS0080005 · 660 served
Town of Puckett
MS0610021 · 655 served
Little Creek Water Association
MS0560015 · 654 served
Town of Mccool
MS0040006 · 652 served
Key Contaminant Concerns in Mississippi
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
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.
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Data source: Utility data from EPA SDWIS. 794 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22