Certified labs by state
Arizona
In Arizona, private-well residents are directed mainly to the Arizona Department of Health Services for water-quality testing guidance and certified drinking-water laboratories, while the Arizona Department of Water Resources handles well records and registration. Arizona guidance highlights naturally occurring groundwater concerns such as arsenic, uranium/radioactivity, and fluoride, along with nitrate contamination risks tied to septic systems, animal waste, and fertilizers.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Certifies drinking water labs
- Arizona Department of Health Services (ADHS), Office of Laboratory Services
- Official certified lab list
- Official page →
- Free or low-cost testing
- ADHS says labs offer water testing for a fee and its 2024 arsenic guide says to watch for updates on a private-well water-testing program with limited registration; I did not find a current public statewide eligibility/details page.
Official resources in Arizona
Arizona’s main state page for private well owners, linking to testing, maintenance, contaminants, workshops, and well-water data.
Search/list of Arizona-certified commercial laboratories licensed to perform drinking-water testing.
Explains how Arizona well owners should test, how often ADHS recommends testing, and where to find certified labs.
Helps residents find well registration numbers, parcel-based records, and imaged well files.
Land-grant university guide covering Arizona domestic wells, testing, maintenance, water quality, and treatment.
Key facts for Arizona
- ADHS licenses Arizona commercial laboratories for drinking-water testing, and its lab list says it is updated on a 24-hour basis.
- ADWR says a new Arizona well should be tested for arsenic, fluoride, lead, nitrates, total coliform bacteria, total dissolved solids, and uranium.
- ADWR says test private wells yearly for total coliform bacteria and nitrates, and every five years for arsenic, fluoride, and uranium.
- ADHS says arsenic is commonly found in Arizona groundwater; its guide cites about 1 in 5 Arizona samples above 10 ppb.
- ADHS says nitrate in Arizona wells can come from septic tanks, animal waste, sewers, and fertilizers; water above 10 ppm is especially dangerous for infants.
- ADHS says Arizona well owners in uranium-rich or granite areas should test at least once for uranium and gross-alpha radiation; EPA also recommends radon-in-water testing.
What to do next
- Start by checking your well record or registration with ADWR so you know the correct parcel and file before ordering sampling kits.
- Use an ADHS-certified drinking-water lab and ask that lab which bottles, preservatives, and holding times apply to your test panel.
- If your area has uranium-rich geology, granite, or elevated indoor radon concerns, ask the lab about adding uranium, gross-alpha, and radon-related testing.
Helpful guides
- How to choose a state-certified drinking water lab
- What to test your private well water for (and how often)
- How to collect a well water sample without ruining the test
- How to read a water test report: MCLs, units and flags