Licensed Septic Companies in Monmouth, OR
5 septic companies serve Monmouth, Oregon, and 5 of them hold a Oregon septic license or certification matched to the Oregon Department of Environmental Quality list (data as of October 2026).
Septic services in Monmouth
Guides: Septic system installation · Septic repair · Drain field repair · Installation cost · Pumping cost
5 septic companies in Monmouth
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Allied Drilling & Concrete LLC
6050 Fern Hill Rd., Monmouth, OR 97361 · Polk County
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3681 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Complete Landworks LLC
267 Gwinn St W., Monmouth, OR 97361 · Polk County
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3477 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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D Carmona Construction LLC
4780 Riddell Rd, Monmouth, OR 97361 · Polk County
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3564 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Mud Brothers Construction LLC
520 Sacre Lane N, Monmouth, OR 97361 · Polk County
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3754 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Solid Rock Trucking and Excavating LLC
16800 Maplegrove Rd, Monmouth, OR 97361 · Polk County
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #992 (Oregon Department of Environmental Quality, verify)
From their website: Installation · Repair · Drain field
No listings match those filters.
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 Monmouth and whether the permit fee is in their quote.
Oregon septic licensing: agencies, license types and how to check a license →
Septic companies in Monmouth: common questions
How many licensed septic companies are in Monmouth, OR?
5 septic companies serve Monmouth, Oregon, and 5 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 Monmouth?
5 listings in Monmouth 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.