Is Ballwin, MO tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for Missouri American Water – St Louis St Charles Counties. 1 PFAS were detected below the limits.
Missouri American Water – St Louis St Charles Counties supplies Ballwin (1.1 million people).
Water system
Missouri American Water – St Louis St Charles Counties
1.1 million people · Surface water · EPA ID MO6010716
Buys treated water from St Louis City Public Water System.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 0 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Full Missouri American Water – St Louis St Charles Counties results
Across Missouri, 6 of 227 water systems EPA tested had PFAS above a 2024 federal limit, and 3 systems were above the lead action level in results from the last five years. Missouri results.
Ballwin homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Ballwin city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Chesterfield 5 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| Wildwood 6 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| Kirkwood 7 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| Maryland Heights 9 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| University City 13 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| St. Peters 13 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
Ballwin ZIP codes (1)
- 63011
Questions
Is Ballwin tap water safe to drink?
Missouri American Water – St Louis St Charles Counties has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Ballwin, MO?
Missouri American Water – St Louis St Charles Counties, which serves 1.1 million people.
Does Ballwin tap water have PFAS?
Missouri American Water – St Louis St Charles Counties had 1 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.
Do Ballwin homes have lead pipes?
Census estimates put 59% of Ballwin homes as built before 1980 (Missouri: 53%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Missouri American Water – St Louis St Charles Counties's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.