About this list
- Agency
- Arizona Department of Health Services (ADHS) - Bureau of State Laboratory Services, Office of Laboratory Licensure & Certification (Environmental Laboratory Licensure)
- Format
- HTML list ('Safe Drinking Water Commercial Lab List', updated every 24 h): lab name, city, state and phone per licensed location; per-lab AZ license number, address and Safe Drinking Water parameters from ADHS's 'with Parameters' view
- Homeowner flag
- Not stated per lab. ADHS's private-well pamphlet says independent laboratories can test private well water and points well owners to this list; it does not say which labs take samples from well owners.
Certified as ofcurrent as of Saturday, November 7, 2026
ADHS Safe Drinking Water Commercial Lab List (List of Arizona Certified Commercial Drinking Water Laboratories). Fetched 2026-11-07 (UTC).
Official sourceTesting your well in Arizona
How often to test
- The Arizona Department of Health Services (ADHS) well owner guide lists a testing schedule. Test all new wells for arsenic, total coliform bacteria, fluoride, lead, nitrates, total dissolved solids (TDS) and uranium. Then test once a year for total coliform bacteria and nitrates, and every 5 years for arsenic, fluoride and uranium. Also test when there are known well water problems in your area, after problems near your well (flooding, wildfire, land disturbances, nearby waste disposal sites), when the water's taste, color or odor changes, or if anyone in your family has an unexplained illness. [1]
- University of Arizona Cooperative Extension (2011) adds: besides yearly testing, test whenever the taste, odor or color of your water changes, and before and after installing any type of water treatment system. [2]
Free testing
We found no statewide free testing program in Arizona. Ask your county health department whether it runs one.
Testing programs and help
- Because groundwater quality differs across Arizona, University of Arizona Cooperative Extension says it is best to check with your drinking water agency or local health department about what to test for, as there may be local pollution issues. [2]
- The ADHS lab licensing office keeps a Private Well Owner Resources list. It links to wellowner.org (finding a well contractor and a drinking water testing lab), EPA's private well pages and an Arizona Department of Environmental Quality pamphlet on what private well owners should do after a fire. [3]
Buying or selling a home
- University of Arizona Cooperative Extension advises testing before buying or selling a home with a private well. It notes this may be a requirement in some areas, so check with your real estate agent or county health department. [2]
State lab and rules
- ADHS says private well water is not tested or regulated by any government organization, so keeping it safe is up to the owner. Independent laboratories can test water from your private well. [1]
- ADHS licenses commercial labs to perform drinking water testing for Arizona and publishes the list, updated on a 24-hour basis. ADHS notes that not all commercial labs perform all drinking water testing. [4]
Show the numbers
| Item | Value | Note |
|---|---|---|
| Zone 1 | 0 counties | |
| Zone 2 | 15 counties | |
| Zone 3 | 0 counties |
Radon in indoor air, not in water. EPA: Zone 1 = highest potential (average indoor radon may be above 4 pCi/L); Zone 2 = 2 to 4; Zone 3 = below 2. EPA says the map should not be used to decide whether an individual home needs testing. Source: U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001, spreadsheet Sep 2025), accessed 2026-11-01.
Sources
- Arizona Department of Health Services, Office of Environmental Health, Protect Your Health: a guide for private well owners in Arizona (no date printed)
- University of Arizona Cooperative Extension, Well Water Testing and Understanding the Results, AZ1486f (April 2011)
- Arizona Department of Health Services, Laboratory Licensure & Certification, Private Well Owner Resources
- Arizona Department of Health Services, List of Arizona Certified Commercial Drinking Water Laboratories (current as of November 3, 2026)
- U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001, spreadsheet Sep 2025)
Loan test (FHA, VA, USDA) in Arizona
- VA. Test results are valid for 90 days from the date the local health authority certifies them, unless the local authority says otherwise. VA’s chapter names no list of contaminants: the water must meet the local health authority’s requirements, or EPA guidelines where it has none. Your lender may ask for specific tests.
- FHA. A well test is required in the situations FHA’s handbook lists, among others, and the report may not be more than 180 days old at disbursement.
- USDA. Guaranteed loans need a water quality test for a private well, done by the local health authority or a state-certified lab, and no more than 180 days old at closing.
Here:
- 1 lab on the Arizona list print a loan or home-sale package price on their own site: see the price table.
Lenders can ask for more (extra tests, a particular lab, who takes the sample): ask your lender before you book. Federal rules as read on Nov 3, 2026 source 1 source 2 source 3. Full comparison: VA, FHA and USDA well water test requirements. Loan test kits sold by mail, with price and days to results: kits compared.
What Arizona labs say on their own websites
State lists say what a lab is certified for, not whether it takes your sample or what it costs. We read each lab’s own site; a second reader re-checked every fact below. 18 labs on this list are on our register so far; 7 say they take homeowner samples and 4 print a price.
| Lab | Bacteria (coliform / E. coli) | Nitrate | Arsenic | Lead | Basic well panel | Home sale / loan package | Turnaround |
|---|---|---|---|---|---|---|---|
| Aquatic Consulting & Testing, Inc. Tempe, AZ · You collect it, or lab staff can | Total Coliform Colilert SM9223B $ 40.00 source E. coli Colilert SM9223B $ 40.00 source | Nitrogen, Nitrate + Nitrite $33.00 source Nitrogen, Nitrate (only) $66.00 source | Arsenic (As) $30.00 source | Lead (Pb) $30.00 source Lead (Pb) and Copper (Cu) $60.00 source | – | – | 15-day turnaround time is generally offered. RUSH turnaround analysis can be provided in addition to weekend and holiday rates. |
| Mohave Environmental Labs Holbrook, AZ · You collect it, or lab staff can | Bacteria Testing Coliform by P/A E-Coli $55 source | – | – | – | Tier 1 Well Test ... $175 source Tier 2 Well Test Tier 1 testing plus: ... Arsenic $275 source | – | – |
| Nortest Analytical Flagstaff, AZ · You collect it, or lab staff can | Total Coliform Bacteria Total E-Coli Price: $26.00* (Qualitative - Presence/Absence Analysis) source Total Coliform Bacteria Total E-Coli Price: $42.00* (Quantitative - MPN Analysis) source | – | – | – | General Well Screening Price: $200.00* source | FHA/HUD Loan Testing Price: $200.00* source | Pricing is for standard turn-around-time, Monday through Thursday. Call for rush testing and pricing information. |
| Turner Laboratories, Inc. Tucson, AZ · You collect the sample with the lab's bottles | Residential Package #1: Tests for Coliform Bacteria (presence/absence for total coliforms and E. Coli ) Cost: $75 source | – | – | – | Residential Package #2 ... Cost: $240 source | – | Test results are delivered in 3-5 business days from the date samples when received by the laboratory. (Package #1); 15 business days (Packages #2 and #3) |
Say they take homeowner samples: Aquatic Consulting & Testing, Inc., Complete Analytical Services, LLC, Inner Basin Environmental, LLC, Mohave Environmental Labs, Nortest Analytical, Sacred Water Testing LLC, Turner Laboratories, Inc..
Prices exactly as each lab prints them, read 15 Nov 2026; re-checked every 90 days. Labs not shown have not been read yet or print nothing for homeowners. Confirm price and turnaround with the lab.
Labs by contaminant
Labs on the Arizona list for one test, with homeowner-accepting labs first.
Well water by county
Private-well population (USGS, 2015), arsenic estimate, radon zone and nearby labs for each county with at least 1,000 people on private wells, largest first.
Maricopa County42,440 on wellsYavapai County24,390 on wellsCochise County23,800 on wellsApache County22,620 on wellsPima County20,680 on wellsNavajo County13,610 on wellsPinal County12,570 on wellsCoconino County12,060 on wellsYuma County9,940 on wellsGila County8,700 on wellsMohave County8,270 on wellsGraham County7,010 on wellsLa Paz County5,770 on wellsSanta Cruz County4,960 on wellsGreenlee County1,350 on wells