Commercial laboratory

McCowan Clinical Laboratory Inc.

Coos Bay, OR · Coos County

Homeowner samplesYou can collect and drop off your own sample
Mail-in kitsNot listed, call to confirm
Walk-in drop offNot listed, call to confirm

Certification and services

State certified
Certification number
OR100026
Certified by
Oregon drinking water program
Certified for
Microbiology
Lab type
Commercial
Last verified
September 30, 2026

Listed on the official state certified laboratory list.

Tests this lab is certified for

Coliform Bacteria

Accredited by the Oregon Environmental Laboratory Accreditation Program (ORELAP ID OR100026) for drinking water and flagged by ORELAP as accepting samples from the public. Accredited for: Microbiology (coliform, ecoli checked). Call for bottles, drop-off hours and pricing; most of these labs sell the real estate transaction panel (arsenic, nitrate, total coliform) required by Oregon's Domestic Well Testing Act.

How to submit a sample

  1. 1
    Call or check the website for the right bottles

    Bacteria samples need a sterile bottle from the lab. Chemistry samples usually take a clean container the lab supplies.

  2. 2
    Collect from a cold tap before treatment

    Skip softeners and filters. Remove the aerator, run the water 3 to 5 minutes, then fill without touching the inside of the cap.

  3. 3
    Keep it cold and deliver within 24 hours

    Bacteria samples are time-sensitive. Use a cooler with ice packs and hand it in or ship it the same day.

  4. 4
    Read the report against the standards

    Compare results with EPA drinking water limits. If anything is over, our problem pages explain what it means and how to treat it.

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