Always use a state-certified laboratory for private well water testing. Certification ensures the lab follows EPA-approved analytical methods, participates in quality assurance programs, and produces legally defensible results.
State-by-state lab directory coming soon.
In the meantime, use your state's certified lab search below.
Find a lab through your state
Each state environmental or health agency maintains a searchable list of certified labs. Search for "drinking water certified lab" + your state name, or contact your state environmental agency directly.
National mail-in labs
Several accredited mail-in labs serve all 50 states and send sample collection kits directly to your home:
What to look for in a lab
- State certification for the analytes you're testing
- Accreditation by a recognized body (e.g., A2LA, NELAP)
- Clear chain-of-custody procedures for sample collection
- Turnaround time that meets your needs (usually 5–10 business days)