Tap Water Results

Missouri tap water quality

1,434 community water systems serving 5.7 million people.

Data: U.S. EPA · How we read the data · How we check it

6
systems with PFAS above a federal limit
73,399
people served by them
227
systems EPA tested for PFAS
3
systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years. 10 more systems have no recent lead results in EPA's database.

Water systems with PFAS above the federal limit

Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.

Missouri PFAS report: chart, rankings and data to download →

Largest water systems in Missouri

Missouri cities and towns

Most health-based violations since 2016

All Missouri utilities on this site

Every Missouri system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 1,434 systems as CSV.

Questions

Does Missouri tap water have PFAS?

EPA tested 227 community water systems in Missouri for 29 PFAS between 2023 and 2025. 15 had at least one regulated PFAS detected, and 6 had an entry-point average above a 2024 federal limit. Those 6 systems serve about 73,399 people (1% of people on community water in Missouri). Systems have until 2029 to meet the limits.

How many Missouri water systems have violations?

361 systems in Missouri had at least one health-based violation since 2016 (1,273 violations in total). 577 violations are currently listed as unaddressed.

Which Missouri water systems are over the lead action level?

3 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Another 10 systems have no lead results in EPA's database from the last five years. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.