State directory

Each live state page is built from that state’s official accredited-lab list, not from business directories or ads.

Last updated 13 October 2026 (US/Pacific).

• Minnesota — 24 labs that MDH says accept private-well samples Live
• Pennsylvania — Penn State homeowner lab plus commercial labs from DEP’s bacteriology list Live
• Ohio — Mahoning County verified; 28 other Ohio labs from Ohio EPA’s August 2026 list Live
• Wisconsin — WSLH and WEAL verified; chemistry from DNR January 2026 list plus DATCP BactiLab Live
• Texas — LCRA verified; commercial and health labs from TCEQ PWS Lab Map Table (03/26/2026) Live
• Michigan — EGLE Laboratory Services verified; commercial and health labs from SOM certified list (3/11/2026) Live
• Maine — HETL verified; in-state commercial labs from Maine CDC list (5/16/2026) Live
• Indiana — IDOH Laboratories verified; public-accepting labs from IDEM in-state list (revised 11/7/2025) Live
• North Carolina — State Lab via local health department verified; 47 in-state commercial labs from NCSLPH list (6 September 2026) Live
• Iowa — SHL verified (3 locations); 11 in-state commercial DW labs from LabCert (9/7/2026); 3 county health Live
• Missouri — SPHL via LPHA verified; 5 commercial chemical + 41 commercial micro labs from DNR Excel (8 September 2026) Live
• Illinois — LHD path verified (coliform/nitrate); 15 IEPA primary chemical + 15 commercial micro + 4 health-dept micro (10 September 2026) Live
• Virginia — VAHWQP Extension clinics verified; 21 in-state Ch46 commercial ∩ DW Excel labs (11 September 2026) Live
• Georgia — UGA AESL W33C via Extension verified; 14 in-state EPD commercial labs (chemical + microbiology PDFs, 1/9/2025) Live
• Kentucky — HydroAnalytical + Marshall County verified; 16 in-state commercial/regional labs (DOW DW list revised 4/28/2025) Live
• Alabama — ADPH/BCL bacterial path verified; 10 in-state commercial labs (ADEM bact Oct 2023 + chem Nov 2023) Live
• South Dakota — DOH Public Health Lab kits verified; 2 in-state commercial labs (DANR Laboratory Certification, 15 September 2026) Live
• Tennessee — TDH Lab Services verified; 10 in-state commercial labs (TDEC commercial PDF 03/17/2026) Live
• West Virginia — OLS Lab Services verified; 6 in-state commercial labs (OLS certified PDF 8/20/2026) Live
• Oklahoma — DEQ SELS verified; 17 in-state commercial labs (Accredited_Labs_2026 GIS 18 Sep 2026) Live
• Nebraska — NPHEL verified; 3 in-state commercial labs (DHHS certified labs.pdf retrieved 19 Sep 2026) Live
• New Hampshire — NHDHHS WAL verified; 9 labs on NHDES private-well guidance PDF (retrieved 20 Sep 2026) Live
• Vermont — VDH Laboratory kits verified; 17 labs on DEC landowner table (retrieved 24 Sep 2026) Live
• Arkansas — ADH Glen F. Baker kits verified; 3 labs named on Water Microbiology resource list (retrieved 25 Sep 2026) Live
• Mississippi — MSDH bacteriological path verified; 6 in-state participating labs (retrieved 26 Sep 2026) Live
• Montana — DPHHS Environmental Lab private-well path verified; 15 in-state labs from certification roster (retrieved 1 Oct 2026) Live
• Louisiana — LDH Private Well Owner Network path verified; Water Test, Inc. PRIVATE WELLS ONLY; 9 in-state labs (retrieved 2 Oct 2026) Live
• Idaho — DHW Free Private Well Water Testing + IBL path verified; 8 labs from Certified Laboratories table (retrieved 3 Oct 2026) Live
• Maryland — local health dept / MDH Water Microbiology + MDE Be Well Wise verified; 22 in-state commercial labs (MDE PDF Latest Revisions 10/1/2026; retrieved 13 Oct 2026) Live
• Alaska through Wyoming (except MN, PA, OH, WI, TX, MI, ME, IN, NC, IA, MO, IL, VA, GA, KY, AL, SD, TN, WV, OK, NE, NH, VT, AR, MS, MT, LA, ID, and MD) Coming soon

How other states will be added

EPA does not test private wells. It points well owners to each state’s drinking-water laboratory certification program. The August 2025 EPA compilation of those programs is linked from EPA’s certification contact page (page last updated 11 August 2026):

EPA: Contact information for certification programs and certified laboratories

We will not publish a state page until we can transcribe a current official list (or honestly say what we could and could not verify). See methodology and README for the nightly-page workflow.

National context

The U.S. Geological Survey states that more than 43 million people — about 15 percent of the U.S. population — rely on domestic (private) wells, and that the quality and safety of that water are not regulated by the federal Safe Drinking Water Act or, in most cases, by state laws. Homeowners are responsible for testing. Source: USGS Domestic (Private) Supply Wells (page retrieved 29 August 2026).