Is St. Charles, MO tap water safe?
The short answer
None of the 3 utilities serving St. Charles has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and CDC’s records.
St Charles PWS, which serves the most people here, has 1 result above EPA’s health benchmark. The worst: Lithium at 45.1 ppb, above EPA’s health benchmark. A health benchmark is a level EPA screens with, not a legal limit.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in St. Charles’s ZIP codes, from EPA’s estimates.
- Open report
St Charles PWS
Missouri · serves 78,961 people · about 19,100 in St. Charles
1 result above EPA’s health benchmark. The worst: Lithium at 45.1 ppb, above EPA’s health benchmark.
No health-based violations since 2016
- Open report
MO American St Louis St Charles Counties
Missouri · serves 1.1 million people · about 8,100 in St. Charles
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 86.8 ppb, above EPA’s health benchmark.
No health-based violations since 2016
- Open report
St Peters PWS
Missouri · serves 52,575 people · about 360 in St. Charles
1 result above EPA’s new limit, which takes effect in 2029, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: PFOA at 4.9 ppt, above EPA’s new limit, which takes effect in 2029.
No health-based violations since 2016
Water testing near St. Charles
The 3 labs Missouri certifies closest to St. Charles, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Eurofins St. Louis Laboratory
Earth City, MO · about 3 miles
Certified for radioactivity
Brothers Lab Services
Maryland Heights, MO · about 5 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics
R.M. Wester and Associates Inc.
St. Peters, MO · about 6 miles
Certified for bacteria
Missouri State Public Health Laboratory: Coliform and E. coli testing for private wells and other private drinking water sources, in kits from your local public health agency. A free state courier can carry the sample to the lab overnight. The handling fee is $10, by check or money order. Private Drinking Water Bacteriological Testing, Missouri Department of Health and Senior Services.
All 64 certified labs for MissouriWhich ZIP codes are in St. Charles: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Missouri DNR, certified microbiological and chemical laboratories; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near St. Charles
Other towns in St. Charles County with a page of their own.
What to do next
- Read St Charles PWS’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water