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Grant County, Oregon

Licensed Septic Companies in Grant County, OR

7 septic companies serve Grant County, Oregon, and 7 of them hold a Oregon septic license or certification matched to the Oregon Department of Environmental Quality list (data as of October 2026).

7 septic companies in Grant County

John Day 3

  • Byron's Excavation

    821 W Hwy 26, John Day, OR 97845

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1156 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (541) 575-0828

  • Casey Miller

    300 Highland Place, John Day, OR 97845

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3786 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (541) 620-4944

  • Harold Wells

    677 West Main St. Spc 106, John Day, OR 97845

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3794 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (541) 975-0518

Monument 1

  • Hoodenpyl Excavating and Grading

    50339 Hwy 402, Monument, OR 97864

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3437 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (503) 354-4015

Mount Vernon 1

  • III Peaks Contracting LLC

    59204 Hwy 26, Mount Vernon, OR 97865

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #900 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (503) 551-2388

Mt. Vernon 1

  • L & L Excavating

    PO Box 28, Mt. Vernon, OR 97865

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1017 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (541) 620-0970

Prairie City 1

  • C&M Contracting, LLC

    Po Box 261, Prairie City, OR 97869

    • Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3562 (Oregon Department of Environmental Quality, verify)

    Per state license: Installation

    (435) 817-2839

Septic licensing in Oregon

Oregon licenses sewage disposal businesses and certifies the installers who work for them. The Oregon DEQ, Sewage Disposal Service licensing issues these credentials: Sewage disposal service license (installer, pumper); DEQ installer certification.

Permits for new systems, replacements and most repairs are issued locally. Ask the contractor which office handles Grant County and whether the permit fee is in their quote.

Oregon septic licensing: agencies, license types and how to check a license →

Septic companies in Grant County: common questions

How many licensed septic companies are in Grant County, OR?

7 septic companies serve Grant County, Oregon, and 7 of them hold a Oregon septic license or certification matched to the Oregon Department of Environmental Quality list (data as of October 2026). Each license badge on this page names the agency and links to its lookup so you can confirm it.

Who licenses septic contractors in Oregon?

Oregon licenses sewage disposal businesses and certifies the installers who work for them. The licensing body is the Oregon DEQ, Sewage Disposal Service licensing.

Which companies install septic systems in Grant County?

7 listings in Grant County install septic systems. New systems and replacements need a permit, so ask each installer to handle the permit and to show their Oregon license.

How do I check a septic contractor's license in Oregon?

Use the Oregon DEQ, Sewage Disposal Service licensing's lookup (https://www.oregon.gov/deq/permits/Pages/YDO-Public-Records.aspx) and search the contractor's name or license number. Our guide to checking a septic license walks through it.