Licensed Septic Companies in Benton County, OR
21 septic companies serve Benton County, Oregon, and 21 of them hold a Oregon septic license or certification matched to the Oregon Department of Environmental Quality list (data as of October 2026).
21 septic companies in Benton County
Philomath 11
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Bravo Group LLC
22940 Harris Rd, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3717 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #4073 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Bravo Group LLC
22940 Harris Rd, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3721 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Bravo Group LLC
22940 Harris Road, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3367 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Bryan Whipple
PO Box 84, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3900 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Dennis Gibson Construction
33653 Mary's River Estates Rd, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #733 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Emmons Trucking and Excavation LLC
23760 Labare Rd, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3697 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Evenflo Plumbing LLC
106 S 11th St., Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #4040 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Hughes Excavation
PO Box 1258, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3637 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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McVay Construction LLC
24411 Old Peak Rd, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3733 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1160 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Patton Construction Services LLC
PO Box 653, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3810 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Thor Excavation LLC
24380 Hwy 20, Philomath, OR 97370
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3422 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Corvallis 9
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Blair Gamble Tractor Service
PO Box 995, Corvallis, OR 97339
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #615 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Cascade Ground Works LLC
37141 Soap Creek Rd, Corvallis, OR 97330
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3471 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3476 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Coleman Custom Builders
29157 Blake Dr., Corvallis, OR 97330
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3679 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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ED Hughes Excavating
PO Box 1082, Corvallis, OR 97339
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3358 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3362 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #627 (Oregon Department of Environmental Quality, verify)
- +3 more credentials
Per state license: Installation
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Groundhog LLC
7135 NW Valley View, Corvallis, OR 97330
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #72 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Hughes Excavation
PO Box 1082, Corvallis, OR 97339
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3718 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Kelci Free
4077 SW Research Way, Corvallis, OR 97333
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3821 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Kevin Armstrong Excavating
971 NE Crane Ln, Corvallis, OR 97330
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #93 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Red Hat Construction, Inc.
560 SW B Ave, Corvallis, OR 97333
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #144 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Blodgett 1
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Bravo Group Excavating LLC
21632 Vanderpool Ln, Blodgett, OR 97326
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #870 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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 Benton 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 Benton County: common questions
How many licensed septic companies are in Benton County, OR?
21 septic companies serve Benton County, Oregon, and 21 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 Benton County?
21 listings in Benton 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.