Arsenic Water Testing Labs in Idaho (20 state-certified labs)

How many labs test for arsenic in Idaho

20 labs on Idaho's official drinking-water lab list are certified to test for arsenic. All 20 are named for arsenic on the list. 6 of them are marked as taking samples from the public. They are listed first. 14 are located outside Idaho.

The list is published by the Idaho Department of Health and Welfare - Idaho Bureau of Laboratories, Drinking Water Laboratory Certification. These labs come from list files with 20 different dates; each lab page shows its own. Fetched 2026-11-03 (UTC).

Idaho labs certified for arsenic

Marked as taking public samples (6)

Other labs on the list (14)

How the Idaho list marks public samples (whole list). Yes for the 8 Idaho labs DHW's private-wells page lists under "Find a Water Testing Laboratory Near You". Not stated for the other labs.

Before you send a sample, call the lab to confirm it is currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Status can change between list updates.

Why test for arsenic in Idaho

Arsenic is invisible, tasteless and mostly natural, and it comes in two forms that respond very differently to treatment. Read our arsenic explainer.

Idaho guidance that mentions arsenic:

• DHW's testing table lists arsenic, fluoride, selenium and uranium every 3 to 5 years; chloride, manganese and sulfate if your water tastes, smells or looks strange; pesticides and petroleum if you live in an agricultural area or have underground petroleum tanks; and manganese if you have a formula-fed infant under 6 months. [1]
• DHW offers free private well water testing (listed as available fall 2026) while funding is available. Idaho residents sign up through DHW's Idaho Health Tools website to have a free kit mailed home. The test covers nitrate, fluoride, arsenic, lead, uranium, manganese, chromium, nickel, copper, zinc, selenium, cadmium and barium, and results come with guidance on next steps. DHW says that because of the volume of kits being processed, it may take up to two months. [1]

Prices at Idaho Bureau of Laboratories, Drinking Water Analysis Submission Form, Private Well Owner, revised 08/21/2024 (prices as printed; gross alpha and beta is by quote). The form says lab fees are also posted at StateLab.idaho.gov; IBL's Sampling and Submission Guide was not read., as published when checked on 3 Nov 2026. Private certified labs set their own prices.

USGS estimates that the most private-well users with arsenic above 10 µg/L, EPA's limit for public water, live in Canyon County, Twin Falls County and Payette County (about 14,043 people in Canyon County, 2010 base year). USGS describes this kind of estimate as useful "for broad screening of the population at risk", so it says nothing certain about any one well. [3]

About 396,215 people in Idaho used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [4] Federal limits are written for public water systems, not private wells, so testing is up to the owner.

For tests that depend on your home (farms nearby, old plumbing, a new baby), use the which-tests checklist. When results arrive, check your numbers against EPA's limits. State guidance, county data and every lab: Idaho.

Other tests in Idaho