Is Wentzville, 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 Wentzville Public Water System.
Wentzville Public Water System supplies Wentzville (41,784 people).
Water system
Wentzville Public Water System
41,784 people · Groundwater · EPA ID MO6010849
Buys treated water from St Charles County Public Water Supply District 2.
| 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: 4.77 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
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.
Wentzville 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 Wentzville city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| O'Fallon 8 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| St. Peters 14 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| St. Charles 19 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| Chesterfield 19 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| Wildwood 20 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
| Maryland Heights 22 mi Missouri American Water – St Louis St Charles Counties | None above limits | 0 ppb |
Wentzville ZIP codes (1)
- 63385
Questions
Is Wentzville tap water safe to drink?
Wentzville Public Water System 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 Wentzville, MO?
Wentzville Public Water System, which serves 41,784 people.
Does Wentzville tap water have PFAS?
None detected above EPA's reporting limits. Wentzville Public Water System had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Wentzville homes have lead pipes?
Census estimates put 10% of Wentzville 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. Wentzville Public Water System'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.