Certified Water Testing Labs in Texas

The Texas Commission on Environmental Quality (TCEQ), through the Public Water System Supervision Program — Accredited Drinking Water Laboratories in Texas (NELAP accreditation). The program follows the EPA's national framework for drinking water laboratory certification, which requires EPA-approved test methods, at least annual proficiency testing, and periodic on-site audits. Source: Texas Commission on Environmental Quality (TCEQ) (https://www.tceq.texas.gov/drinkingwater/pwss.html) and EPA (epa.gov/dwlabcert).

80 accredited drinking water labs are located in Texas, as of the official list we pulled on August 2, 2026. Accreditation changes throughout the year, so treat this as a starting point and confirm status with the lab. Source: Texas Commission on Environmental Quality (TCEQ) (https://www.tceq.texas.gov/drinkingwater/pwss.html).

The EPA recommends testing private wells annually for total coliform bacteria, nitrates, total dissolved solids, and pH — and testing immediately after flooding, well repairs, nearby construction, or any change in your water's taste, odor, or color. Your local health department can tell you which contaminants are common in Texas groundwater. Source: EPA, Protect Your Home's Water (epa.gov/privatewells).

This list covers labs located in Texas that were on the official list published by the Texas Commission on Environmental Quality (TCEQ) as of August 2, 2026. Accreditation changes during the year, so a lab missing from this page may have been accredited since then — the official source linked above always has the current list. What we'd avoid is any lab that can't show a current drinking water certification at all. The EPA's guidance is to only use certified laboratories for drinking water testing. Source: EPA, Protect Your Home's Water (epa.gov/privatewells).

Ask the lab about a mail-in collection kit — many certified labs ship one with instructions and pre-treated bottles. Timing matters for some tests (bacteria samples have a short window between collection and analysis), so follow the lab's collection instructions exactly. Your local health department is also worth a call; some offer private well testing for free. Source on health department testing: EPA, Protect Your Home's Water (epa.gov/privatewells).