Mississippi Water Quality
Drinking water data for all 82 counties.
Avg Water Score
51.7
State Grade
D
Counties with Data
82
of 82 total
All Mississippi Counties
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Frequently Asked Questions
Which county in Mississippi has the best water quality?
Adams County has the highest water quality score in Mississippi at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Mississippi has the most water violations?
Issaquena County has among the lowest water quality scores in Mississippi at 0.9/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Mississippi?
Mississippi has an average water quality score of 51.7/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Mississippi water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.