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Private wells in Louisiana: labs, drillers and who to call
One place for Louisiana well owners, buyers and the pros who work with them: the state's private well program, how to find a state-certified lab and a licensed well driller, and every Louisiana page on this site. Every fact links to its source.
Louisiana at a glance
- Who's on a well: USGS estimates about 492,000 people in Louisiana supplied their own household water in 2015, about 11% of the state's population. Most of them use private wells.1
- Who tests: EPA rules for public water systems don't apply to private wells, so testing is up to the owner. CDC says to test at least once a year for total coliform bacteria, nitrates, total dissolved solids and pH, use a state-certified lab, and ask your health department what else to test for where you live.2
- Selling or buying a home: we haven't reviewed Louisiana's home-sale testing or disclosure rules yet, so we don't say whether a test is required. Ask your agent or attorney and the state program below, and see the state table in our homebuyer's guide.
Who to contact
- Licensed well drillers and pump installers: Louisiana State Licensing Board for Contractors: Water Well Drilling classification. Check a contractor's license before you hire.
- State-certified labs: the Louisiana Department of Health certifies labs for drinking water testing. Find a certified drinking water lab (links to PDFs). Many certified labs are city or industry labs that only test their own samples, so call before you send a sample.3
- Local help: CDC says local or state health or environmental departments often test for nitrates and coliform bacteria, should have a list of certified labs, and can help you understand your results.2
- EPA Safe Drinking Water Hotline: (800) 426-4791.2
County pages
We haven't published a Louisiana county page yet. Until we do, the state contacts above and the guides below apply statewide.
Find a pro in Louisiana
Our directory doesn't cover Louisiana yet. Use the official driller and lab lookups above.
Guides for Louisiana well owners
- Buying a home with a well (offer contingencies, which tests to order, and home-sale rules by state)
- Who regulates private wells?
- How often to test a private well
- Best way to test well water
- How to read your well water test results
- Arsenic in well water, nitrate, uranium and radon
- Getting a new well drilled
- Shock chlorinating a well
- For professionals: selling a home with a well (realtors) and homes with a well (home inspectors)
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Dieter, C.A., and others, 2018, Estimated Use of Water in the United States County-Level Data for 2015 (ver. 2.0), U.S. Geological Survey data release (state totals of the county self-supplied domestic population). https://doi.org/10.5066/F7TB15V5 ↩
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CDC, "Guidelines for Testing Well Water" (July 1, 2024). https://www.cdc.gov/drinking-water/safety/guidelines-for-testing-well-water.html ↩↩↩
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U.S. EPA, "State Certification Programs Certify Laboratories to Conduct Drinking Water Analyses" (August 2025). https://www.epa.gov/system/files/documents/2023-03/state-cert-programs-certify-labs-to-conduct-drinking-water-analyses.pdf ↩