California Water Testing Labs
Find EPA-certified water testing laboratories in California. All labs listed are certified by California State Water Resources Control Board and meet federal standards for drinking water analysis.
State Certification Program
California State Water Resources Control Board
Visit Certification Program WebsiteLaboratory Directory
Interactive map—click dots to see laboratory details
đź’ˇ Local Resources & Tips
California's Environmental Laboratory Accreditation Program (ELAP) provides one of the most comprehensive systems; search by county or laboratory name
How to Use This Directory
- 1.Access the laboratory directory using the link above
- 2.Verify certifications: Confirm labs hold current state certification for the specific contaminants you want to test (bacteria, nitrate, metals, VOCs, PFAS)
- 3.Request pricing: Call multiple labs to compare prices and turnaround times—costs vary significantly even within the same state
- 4.Schedule testing: Follow lab instructions for sample collection, storage, and delivery
- 5.Review results: Compare detected concentrations against EPA standards and take appropriate action
Testing Quick Facts
- •Annual minimum: Bacteria + nitrate ($150-$200)
- •Every 2-3 years: Comprehensive panel ($250-$400)
- •PFAS testing: Near risk sources ($300-$500)
- •Turnaround: 24-48 hrs (bacteria), 5-10 days (comprehensive)
Prefer a Simpler Option?
Can't find a convenient local lab? Mail-in testing offers EPA-certified analysis without appointments or travel.
SimpleLab
Standard Home Water Test
$232
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
SimpleLab
Advanced Home Water Test
$369
Most comprehensive home water test including all standard tests plus additional parameters for ultimate peace of mind.