privatewelldata / States / Missouri
Missouri well water testing
2 labs are listed on Missouri’s official certified-lab list. Updated 2026-10-17.
Official lab list for Missouri
Where the labs are
| Town | Labs |
|---|---|
| Earth City | 1 |
| Saint Louis | 1 |
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See all 2 Missouri lab listings →
How to choose a lab
- Pick a lab on the official list above that is certified for each test you need (bacteria and chemistry are often separate certifications).
- Ask for the lab’s own sample bottles and instructions; bacteria samples usually must reach the lab within 24–30 hours.
- Compare prices for a basic package (bacteria, nitrate, pH/TDS) and add arsenic or other metals where local data shows a risk.
- Be wary of free in-home tests from treatment-system sellers — see our salesperson checklist.
Questions
Where can I get my well water tested in Missouri?
Use a lab on Missouri’s official certified-lab list. We count 2 listed labs (excluding those marked as serving public water systems only), most in Earth City, Saint Louis. Confirm the lab is certified for the exact tests you need before you send a sample.
What should I test my well for in Missouri?
Test every year for bacteria (total coliform and E. coli), nitrate, pH and total dissolved solids (CDC). Use our test helper for a list that fits your home.