Water in Mississippi.
Mississippi's small-system infrastructure was severely tested by the 2022 Jackson water crisis. Aging treatment plants and disinfection byproducts are persistent concerns across the state.
Jackson's 2022 water system collapse left 150,000 residents without safe tap water for weeks.
How Mississippi regulates drinking water.
Federal SDWA primacy. No state MCLs stricter than federal. Jackson is under EPA federal consent decree post-2022 crisis.
Mississippi State Department of Health — Bureau of Public Water Supply
Mississippi's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2020
Jackson under EPA emergency order over chronic SDWA violations.
- 2022
Pearl River flooding collapses Jackson's primary treatment plant; 150,000 residents lose safe tap water for over a month.
- 2023
Federal third-party manager appointed for Jackson water system.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Mississippi's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- aquiferSparta Aquifer + Memphis Sand
Statewide groundwater supply.
- riverPearl River
Jackson surface supply.
- riverTennessee-Tombigbee Waterway
Source-water mix
~75% groundwater, ~25% surface water
Major cities served
Jackson · Gulfport · Southaven · Hattiesburg
Who actually serves the water.
The largest public water systems in Mississippi by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Jackson Department of Public WorksJackson· Under federal third-party management since 2023.Under federal third-party management since 2023.150Kserved
- Gulfport Public WorksGulfport72Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Mississippi's drinking water systems.
Industrial chemical legacy is limited compared to neighboring LA. Agricultural runoff (cotton, corn, catfish) drives nitrate and pesticide exposure in the Delta. Coastal shipbuilding (Pascagoula) drives some PFAS concern.
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.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
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.
Jackson residents — over 80% Black — have faced sustained water-system failures for years and the longest single-system shutdown in modern U.S. history.
~20% on private wells, concentrated in rural Delta counties.
What's coming for Mississippi's water.
Pearl River extreme flooding (2020, 2022) overwhelmed Jackson treatment plant — the central crisis driver. Coastal storm intensity affects Gulf Coast intakes. Aquifer drawdown in northwest MS accelerates with shifting agricultural patterns.
Voluntary statewide
MS State Department of Health provides voluntary testing assistance.
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 Mississippi specifically.
- 1
Is my Jackson address still under emergency boil-water advisories?
- 2
Has my private well been tested for arsenic, nitrate, and bacterial pathogens?
- 3
If I live in Hattiesburg or Gulf Coast, has my system reported any PFAS results?
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.
What's changed in Mississippi water law.
Drinking water regulation moves at the state level as much as the federal level. Below are notable recent bills and regulatory actions specific to Mississippi.
- 2023
Jackson Water Crisis federal third-party management framework established.
For Jackson and rural systems: NSF/ANSI 53 carbon block for TTHMs and lead. Boil-water advisories must be followed; filters are not a substitute.
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 Mississippi