Updated April 2026 · EPA SDWIS data
Mississippi Drinking Water Quality
5 water systems · 418,203 people served · Avg score: 70
Mississippi has 5 public water systems serving 418,203 people, with an average Water Safety Score of 70 of 100 (fair). EPA SDWIS records show 1 systems with at least one open or recent violation.
Mississippi Water Systems
How Mississippi Compares Nationally
Mississippi runs 11.0 points below the U.S. average Water Safety Score of 81.0 — meaningfully worse than the typical state, usually a sign of older infrastructure, more small-system capacity gaps, or source-water challenges.
1 of 5 Mississippi water systems (20%) have an open or recent EPA violation — roughly typical for a U.S. state. Most violations cluster in small systems serving fewer than 10,000 people.
The most-detected contaminants flagged in EPA SDWIS for Mississippi are Haloacetic Acids (HAA5) (5 systems) and Total Trihalomethanes (5 systems). These typically reflect either source-water characteristics — agricultural runoff for nitrate, geology for arsenic, industrial proximity for PFAS — or distribution-system effects like lead from service lines and disinfection byproducts.
Why Mississippi Looks the Way It Does
Three factors usually explain a state's drinking water profile. First, source water — states drawing primarily from deep protected aquifers face fewer treatment challenges than states reliant on surface water downstream of agriculture or industry. Second, infrastructure age — older Northeast and Midwest distribution networks carry more lead service lines and aging treatment plants, which surface as monitoring or contaminant violations. Third, system-size mix — states with many small rural systems concentrate violations because small systems have thinner compliance staffs.
Mississippi's federal regulatory enforcement runs under the EPA primacy framework, which delegates Safe Drinking Water Act enforcement to the state drinking water program with EPA oversight. State enforcement capacity varies, which is one of the reasons two neighboring states with similar source water can have very different violation rates in EPA SDWIS records.
How These Numbers Are Calculated
All counts and scores on this page come directly from the EPA Safe Drinking Water Information System (SDWIS). Contaminant Maximum Contaminant Levels (MCLs) come from EPA's National Primary Drinking Water Regulations. The Water Safety Score weights health violations 40%, contaminant exceedances 30%, enforcement actions 20%, and monitoring violations 10%. Read the full IsWaterSafe methodology for the join logic and refresh cadence.
Frequently Asked Questions
How many public water systems does Mississippi have?
Mississippi has 5 public water systems registered in the EPA Safe Drinking Water Information System (SDWIS), serving an estimated 418,203 residents. The systems range from large municipal utilities serving entire metro areas to small community systems serving a few hundred customers.
Is Mississippi drinking water safe?
Mississippi's average Water Safety Score is 70 of 100. Mississippi runs 11.0 points below the U.S. average Water Safety Score of 81.0 — meaningfully worse than the typical state, usually a sign of older infrastructure, more small-system capacity gaps, or source-water challenges. 1 of 5 Mississippi water systems (20%) have an open or recent EPA violation — roughly typical for a U.S. state. Most violations cluster in small systems serving fewer than 10,000 people. An EPA Maximum Contaminant Level violation is a regulatory event, not a clinical diagnosis — see the IsWaterSafe disclaimer for the distinction.
Which contaminants matter most in Mississippi?
The most-detected contaminants flagged in EPA SDWIS for Mississippi are Haloacetic Acids (HAA5) (5 systems) and Total Trihalomethanes (5 systems). These typically reflect either source-water characteristics — agricultural runoff for nitrate, geology for arsenic, industrial proximity for PFAS — or distribution-system effects like lead from service lines and disinfection byproducts.
Where can I find my Mississippi utility's official report?
Every community water system in Mississippi is required by the Safe Drinking Water Act to publish an annual Consumer Confidence Report (CCR) by July 1, listing every regulated contaminant detected and how it compared to the EPA Maximum Contaminant Level. CCRs are typically posted on each utility's website. The state's drinking water program (operating under EPA primacy) maintains a portal of CCR links and enforcement records.
How is Mississippi's data updated?
EPA refreshes SDWIS quarterly, and IsWaterSafe re-runs the Mississippi state and ranking pages against each new release. Last refreshed April 2026. Note that violations have a typical 60–90 day reporting lag from the date of detection.
Sources: EPA Safe Drinking Water Information System (SDWIS), EPA National Primary Drinking Water Regulations, EWG Tap Water Database. SDWIS and EPA regulations are U.S. government public domain. Cite as: "IsWaterSafe, Mississippi, April 2026 reading. Data: EPA SDWIS."
Last updated 2026-04-04 · 5 Mississippi systems tracked.
The this entity record above pulls directly from the EPA Safe Drinking Water Information System (SDWIS). What follows is the per-entity context — how this entity sits in the broader U.S. public drinking-water safety distribution and which underlying factors drive the headline numbers.
Every number on this page links back to the EPA Safe Drinking Water Information System (SDWIS); the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. public water systems. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.