39 named for arsenic itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Oregon but on its list.
USGS estimate for Oregon.
How many labs test for arsenic in Oregon
39 labs on Oregon's official drinking-water lab list are certified to test for arsenic. All 39 are named for arsenic on the list. 36 of them are marked as taking samples from the public. They are listed first. 27 are located outside Oregon.
The list is published by the Oregon Health Authority (OHA) - Oregon State Public Health Laboratory, Oregon Environmental Laboratory Accreditation Program (ORELAP). List version on file: search as fetched 2026-11-15 (live database, no list date). Fetched 2026-11-15 (UTC).
Oregon labs certified for arsenic
Marked as taking public samples (36)
| Lab | Location | Arsenic certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| ACZ Laboratories, Inc. | Steamboat Springs, CO | Named on the official list | Public samples: yes (per state) | 2/9/2027 |
| Alexin Analytical Laboratories, Inc. | Tigard, OR | Named on the official list | Public samples: yes (per state) | 5/4/2027 |
| Alliance Technical Group, LLC - Seattle | Seattle, WA | Named on the official list | Public samples: yes (per state) | 5/9/2027 |
| Alliance Technical Group, LLC-Akron | Cuyahoga Falls, OH | Named on the official list | Public samples: yes (per state) | 2/26/2027 |
| ALS Environmental, Kelso | Kelso, WA | Named on the official list | Public samples: yes (per state) | 2/10/2027 |
| Analytical Laboratory Group | Eugene, OR | Named on the official list | Public samples: yes (per state) | 4/19/2027 |
| Anatek Labs, Inc. - Spokane | Spokane, WA | Named on the official list | Public samples: yes (per state) | 4/10/2027 |
| Anatek Labs, Inc.-ID | Moscow, ID | Named on the official list | Public samples: yes (per state) | 6/26/2027 |
| Apex Laboratories, LLC | Tigard, OR | Named on the official list | Public samples: yes (per state) | 6/25/2027 |
| ASSET Laboratories | Las Vegas, NV | Named on the official list | Public samples: yes (per state) | Not on the list |
| Babcock Laboratories, Inc. | Riverside, CA | Named on the official list | Public samples: yes (per state) | 12/18/2026 |
| BSK Associates | Fresno, CA | Named on the official list | Public samples: yes (per state) | 1/29/2027 |
| City of Bend Water Quality Laboratory | Bend, OR | Named on the official list | Public samples: yes (per state) | 8/22/2027 |
| Columbia Laboratories Inc. | Portland, OR | Named on the official list | Public samples: yes (per state) | 6/29/2027 |
| EMSL Analytical, Inc. | St. Louis, MO | Named on the official list | Public samples: yes (per state) | 2/26/2027 |
| Enthalpy Analytical, LLC - Orange | Orange, CA | Named on the official list | Public samples: yes (per state) | 1/29/2027 |
| Environmental Science Corporation (dba Pace Analytical National Center for Testing & Innovation) | Mt. Juliet, TN | Named on the official list | Public samples: yes (per state) | 1/15/2027 |
| Eurofins Cleveland | Barberton, OH | Named on the official list | Public samples: yes (per state) | 2/27/2027 |
| Eurofins Lancaster Laboratories Environment Testing, LLC | Lancaster, PA | Named on the official list | Public samples: yes (per state) | 9/11/2027 |
| Eurofins Pomona | Pomona, CA | Named on the official list | Public samples: yes (per state) | 1/29/2027 |
| Eurofins South Bend | South Bend, IN | Named on the official list | Public samples: yes (per state) | 9/16/2027 |
| Eurofins Washington | Burlington, WA | Named on the official list | Public samples: yes (per state) | Not on the list |
| Friedman & Bruya, Inc | Seattle, WA | Named on the official list | Public samples: yes (per state) | 4/5/2027 |
| Grants Pass Water Laboratory, Inc./The Water Lab | Grants Pass, OR | Named on the official list | Public samples: yes (per state) | 12/17/2026 |
| Matrix Sciences dba KTL | Pasco, WA | Named on the official list | Public samples: yes (per state) | 2/14/2027 |
| Microbac Laboratories, Inc. - Arcata | Arcata, CA | Named on the official list | Public samples: yes (per state) | 9/2/2027 |
| Neilson Research Corporation | Medford, OR | Named on the official list | Public samples: yes (per state) | 12/23/2026 |
| Pace Analytical Services, LLC - Mansfield, MA (320 Forbes) | Mansfield, MA | Named on the official list | Public samples: yes (per state) | Not on the list |
| Pace Analytical Services, LLC - Minneapolis MN | Minneapolis, MN | Named on the official list | Public samples: yes (per state) | Not on the list |
| Pace Analytical Services, LLC -- Bakersfield | Bakersfield, CA | Named on the official list | Public samples: yes (per state) | 4/22/2027 |
| RJ Lee Group, Inc./Columbia Basin Analytical Laboratories | Pasco, WA | Named on the official list | Public samples: yes (per state) | 2/23/2027 |
| Rose City Laboratories | Portland, OR | Named on the official list | Public samples: yes (per state) | 11/16/2026 |
| SGS Silver State Analytical Laboratories - Reno | Reno, NV | Named on the official list | Public samples: yes (per state) | 3/13/2027 |
| Umpqua Research Company | Myrtle Creek, OR | Named on the official list | Public samples: yes (per state) | 1/30/2027 |
| Waterlab Corp. | Salem, OR | Named on the official list | Public samples: yes (per state) | 4/10/2027 |
| Weck Laboratories, Inc. | City of Industry, CA | Named on the official list | Public samples: yes (per state) | 1/29/2027 |
Other labs on the list (3)
| Lab | Location | Arsenic certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| Continental Water Laboratory | Sacramento, CA | Named on the official list | Not marked as taking public samples | 1/29/2027 |
| Portland Water Bureau Laboratory | Portland, OR | Named on the official list | Not marked as taking public samples | 11/6/2027 |
| U.S. Region 9 Lab - Corvallis, OR | Corvallis, OR | Named on the official list | Not marked as taking public samples | 8/31/2027 |
How the Oregon list marks public samples (whole list). Yes for labs ORELAP marks as accepting public samples (OHA: "these laboratories can accept samples from anyone"); No for drinking-water labs without that mark (mostly utility and federal 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 Oregon
Arsenic is invisible, tasteless and mostly natural, and it comes in two forms that respond very differently to treatment. Read our arsenic explainer.
Oregon guidance that mentions arsenic:
- OHA says Oregon requires well testing only when a property with a well is sold, but it recommends testing for coliform and E. coli bacteria every year, nitrate every year, and arsenic every 3 to 5 years. You may need to test more often if the well has a history of contamination, the septic system recently malfunctioned, household members have a stomach illness, infants drink the water, or any equipment has broken. OHA lists typical costs of $20 to $40 for the bacteria and nitrate tests and $25 to $45 for arsenic. [1]
- If arsenic is above 8 ppb, OHA says to retest; if levels stay high, install a treatment system and keep testing every year at the faucet you drink from and every 3 years at the wellhead. [1]
- In the LUBGWMA program the first test covers nitrate, arsenic, lead, total coliform and E. coli. Depending on the nitrate result, OHA and the county health departments offer free retesting; households at 10 mg/L or more qualify for free drinking water delivery, and those between 10 and 24.99 mg/L are also offered a free reverse osmosis system. OHA says free testing is not available to households outside the LUBGWMA. [2]
- Under Oregon's Domestic Well Testing Act (ORS 448.271), the seller of real estate with a domestic well must have the well water tested for arsenic, nitrate and total coliform bacteria by an accredited lab. Within 90 days of receiving the results, the seller or their representative must send the results to the buyer, and a Real Estate Transaction (RET) form plus the results to OHA. Properties with spring wells or irrigation-only wells are exempt. [3]
USGS estimates that the most private-well users with arsenic above 10 µg/L, EPA's limit for public water, live in Malheur County, Umatilla County and Klamath County (about 2,989 people in Malheur 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. [4]
Show the numbers
| Item | Value | Note |
|---|---|---|
| Malheur County | 2,989 people (2010 base year) | |
| Umatilla County | 2,377 people (2010 base year) | |
| Klamath County | 2,254 people (2010 base year) | |
| Jackson County | 2,027 people (2010 base year) | |
| Josephine County | 1,867 people (2010 base year) | |
| Deschutes County | 1,704 people (2010 base year) |
USGS model estimate for broad screening, not a measurement of any well. Only a test tells you about your own well. Source: USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017), accessed 2026-11-01.
About 631,538 people in Oregon used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [5] 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: Oregon.
Other tests in Oregon
- Oregon Health Authority, Domestic Well Safety Program, Routine Domestic Well Testing
- Oregon Health Authority, LUBGWMA Frequently Asked Questions
- Oregon Health Authority, Domestic Well Safety Program, Submit a Domestic Well Testing Act and Real Estate Transaction (RET) Form
- USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017)
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- ORELAP laboratory search (ODIE): accredited for the Drinking Water matrix (official list)
ORELAP laboratory search (ODIE): accredited for the Drinking Water matrix.
Official source