Onterris Laboratories, LLC - El Dorado Hills

At a glance

What it is certified to test

1 of the 9 common well tests on the WA list (see which)

Price

not published on the state list: ask the lab for a quote

Turnaround

not stated on the state list or the lab’s website: ask when you order

Homeowner samples

yes (Washington list)

Lab facts

Listed by

Washington (Washington State Department of Ecology - Lab Accreditation Program (with WA DOH))

Address

1104 Windfield Way, El Dorado Hills, CA 95762 · Open in Google Maps

County

El Dorado

Phone

(916) 673-1520

Public / homeowner samples

Public samples: yes (per state)

WA Ecology Lab Search label 'Accepts Commercial/Public Samples' (broader than homeowner: confirm the lab takes household samples)

Location note

Lab is in CA, certified by Washington (often used as a mail-in lab).

Left blank on the list

The Washington list (version Information current as of 11/13/2026) gives no website for this lab.

Certification record

Certificate ID

EPA CA00413 / WA DOH #258

Issued by

Washington State Department of Ecology - Lab Accreditation Program (with WA DOH) (certification program)

Expiry on the list

02/26/2027 · expires in 103 days

List version

WA Ecology - Environmental Laboratories Accredited for Drinking Water Analyses (with scopes), version Information current as of 11/13/2026

We fetched it

15 Nov 2026 (file SHA-256 e7c9dab549d5…) · open the state file

Tests on the state list

• Named on the official list The state list names this analyte (or a column for it) for this lab.
• Group-level certification Certified for a parent group (e.g. 'Inorganics') that includes this analyte. Confirm the specific test with the lab.
• Partial group certification The list marks the group as 'Partial'. Confirm this analyte with the lab.
• Subcontracted The lab sends this analyte to another accredited lab (MDH 'X*').

30 drinking-water analytes on the WA scope (Mass Spectrometry).

Also certified by other states

Same business (same street address and ZIP) on another state's official list. Each state certifies separately, so each listing keeps its own source.

• Vermont · VT 4042 · PFAS · Public samples: ask the lab
  Vermont Department of Health - Laboratories Certified for Drinking Water Analysis (September 28, 2026)
• Ohio · no ID on list · PFAS · Public samples: ask the lab
  Ohio EPA - Laboratories Certified/Accepted to Perform Analyses on Public Drinking Water (November 2026)
• Virginia · VA lab 460235 / EPA CA00413 · PFAS · Public samples: ask the lab
  Virginia DCLS - Drinking Water Certified Labs (analyte detail) (Current as of 8/1/2026)
• New York · NY ELAP 11411 · PFAS · Public samples: ask the lab
  NY DOH - New York State accredited labs for PFOA/PFOS (EPA 533 / 537.1 v2), private-well rebate program (page fetched 2026-10-29)
• California · CA ELAP 2892 · PFAS · Public samples: yes (per state)
  California ELAP - Accredited Laboratories (map layer) + per-lab Fields of Accreditation (Map layer fetched 2026-11-15; scope PDF as of 2/1/2026)
• Michigan · 9932 · PFAS · Public samples: ask the lab
  EGLE - Certified Out of State Laboratories + EGLE - Out-of-State Certified PFAS Laboratories (9/8/2025 (out-of-state, out-of-state PFAS lists))
• Florida · FL DOH E87777 · PFAS · Public samples: ask the lab
  Florida DOH - Laboratories Certified Under NELAP (DEP Qlik app): Analyte Search + Organization Name and Location Search, Matrix = Drinking Water, Certification Status = Accredited, Active labs (DOH Version: 11/07/2026 08:30:01 (Qlik app refresh 11/9/2026 4:26:47 AM; live database))
• Texas · TX Lab ID T104704189 · PFAS · Public samples: ask the lab
  TCEQ Laboratory Approval Status - List of Accredited Laboratories (public database, Matrix: Drinking Water) (Live database, searched 2026-11-15 ("accurate as of the date and time of the search"))
• Nevada · NV Lab ID CA00413 · PFAS · Public samples: ask the lab
  NDEP Laboratory Approval Status - Certified Lab List (public database, Matrix: Drinking Water) (Live database, searched 2026-11-15 ("accurate as of the date and time of the search"))
• Colorado · CO Lab Cert ID CA00413 · PFAS · Public samples: yes (per state)
  CDPHE Drinking Water Lab Certifications (Looker Studio report on cdphe.colorado.gov/dwlabs) (Live report, no edit date shown; data read by the report at 2026-11-02 20:39 UTC (Looker Studio dataTimestamp))
• Oregon · 4042 · PFAS · Public samples: yes (per state)
  ORELAP laboratory search (ODIE): accredited for the Drinking Water matrix (search as fetched 2026-11-15 (live database, no list date))

Before you send a sample

Call the lab to confirm it's currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Bacteria samples have short holding times. Status can change between list updates. To check a status, contact the Washington certification program.

Is this your lab?

Labs can ask for corrections through the agency that publishes their state list. Homeowner service, prices and turnaround above come only from the lab’s own website. To ask us to correct or remove this listing, write to us (how we handle listings).