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Is Lake St. Louis, MO tap water safe?

St Charles County PWSD 2 serves Lake St. Louis, by EPA’s records. Here is what EPA’s and CDC’s records show for it, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

St Charles County PWSD 2 serves Lake St. Louis. In EPA’s and CDC’s records it has 2 results above the health goal and 1 result above EPA’s health benchmark, and no health-based violation since 2016.

The worst: Lithium at 47.5 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.

Some homes in a town are on private wells or a small system of their own. The name on your water bill tells you which is yours.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in St Charles County PWSD 2’s water.

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Every claim, and more filters, in the full report

Water testing near Lake St. Louis

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab Missouri certifies.

The 3 labs Missouri certifies closest to Lake St. Louis, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • R.M. Wester and Associates Inc.

    St. Peters, MO · about 10 miles

    Certified for bacteria

    (636) 928-9628

  • City of St. Louis-Howard Bend Laboratory

    Chesterfield, MO · about 16 miles

    Certified for bacteria, nitrate, minerals and other inorganics, organic chemicals

    (314) 256-5723

  • Missouri American Water Co.-St. Louis County

    Chesterfield, MO · about 16 miles

    Certified for bacteria

    (314) 469-6050

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 Missouri

ZIP codes in Lake St. Louis

Which ZIP codes are in Lake St. Louis: 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 Lake St. Louis

Other towns in St. Charles County with a page of their own.

What to do next