Texas Well Water Testing Labs

Find a well water testing lab in Texas

A free, independent list of 80 accredited drinking-water labs across 46 Texas counties, built from public TCEQ data, with tips for testing a private water well.

Independent directory. Listings come from the TCEQ Public Water System Lab Map Table (updated 03/26/2026). These labs are accredited for public drinking-water samples; call first to confirm they accept private-well samples, which tests they run, sample bottles, drop-off hours and price.

Labs by county

Angelina County (1)Bastrop County (1)Bexar County (4)Bowie County (1)Brazoria County (1)Brazos County (1)Cameron County (1)Collin County (2)Comanche County (1)Dallas County (4)Denton County (2)Ector County (1)El Paso County (3)Erath County (1)Fort Bend County (1)Grayson County (2)Gregg County (1)Guadalupe County (1)Harris County (7)Hays County (1)Hidalgo County (1)Hill County (1)Hutchinson County (1)Kerr County (2)Llano County (1)Lubbock County (2)McLennan County (2)Midland County (1)Montgomery County (2)Nacogdoches County (1)Nolan County (1)Nueces County (2)Orange County (1)Polk County (1)Randall County (2)San Jacinto County (1)Smith County (3)Tarrant County (4)Taylor County (2)Tom Green County (1)Travis County (4)Victoria County (2)Walker County (1)Webb County (1)Wichita County (2)Williamson County (1)

Before you test

Texas does not regulate private wells, so testing is up to the owner. The testing guide covers what to test and when. Some groundwater conservation districts test wells free or at reduced cost, and Texas A&M AgriLife runs periodic well-screening events.

Don't see your county? Labs in nearby counties often accept samples. Use the TCEQ accredited-lab search or suggest a lab.