Licensed Septic Companies in Washington County, OR
51 septic companies serve Washington County, Oregon, and 48 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 Washington County
Guides: Septic tank pumping · Septic system installation · Septic inspection · Septic repair · Drain field repair · Installation cost · Pumping cost
51 septic companies in Washington County
Hillsboro 13
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Aloha
8600 SW Hillsboro Hwy, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #948 (Oregon Department of Environmental Quality, verify)
From their website: Pumping · Installation · Inspection · Perc testing · Grease traps
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Dirt Road Excavation & Debris
470 NW Yonia Ct, Hillsboro, OR 97124
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3971 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Hollenbach & Hurd, Inc.
5291 NE Elam Young Pkwy Ste 180, Hillsboro, OR 97124
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3804 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Horner Brothers Construction
3337 NE Jackson Road Loop, Hillsboro, OR 97124
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3732 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Lead Construction Inc
2194 SE 53rd Ave, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3874 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Patrick Walker
4490 SW Minter Bridge Rd, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3653 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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PLI Systems
3045 SE 61st Ct., Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3861 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Renner Trucking & Excavating
228 SW Walnut St, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3925 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Subcom Excavation
PO Box 4055, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3895 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Subcom Excavation & Utilities
PO Box 4055, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #785 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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West Side Drain
5976 SE Alexander Ste. C, Hillsboro, OR 97123
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1038 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Whiz to Coho Inc.
12800 NW Bishop Rd, Hillsboro, OR 97124
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3369 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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West Side Drain and Septic
5976 SE Alexander St Ste C, Hillsboro, OR 97123
From their website: Pumping · Installation · Inspection · Drain field · Grease traps
Beaverton 8
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Alpha Environmental
11080 SW Allen Blvd Suite 100, Beaverton, OR 97005
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3660 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Alpha Environmental Services
11080 SW Allen Blvd #100, Beaverton, OR 97005
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3940 (Oregon Department of Environmental Quality, verify)
From their website: Pumping · Inspection Per state license: Installation
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Alpha Environmental Services Inc
11080 SW Allen Blvd Ste 100, Beaverton, OR 97005
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3549 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Alpha Environmental Services Inc
11080 SW Allen Blvd Ste 100, Beaverton, OR 97005
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3554 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Farminton Digs LLC
22385 SW Farmington Rd, Beaverton, OR 97007
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #4043 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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JQ Construction Inc.
PO Box 250, Beaverton, OR 97075
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3374 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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SRD Plumbing LLC
6805 SW Madrid Dr., Beaverton, OR 97078
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #4047 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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The Excavators LLC
21975 SW Riggs Rd, Beaverton, OR 97007
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3510 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Forest Grove 6
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Bell Construction Inc
47333 SW Carpenter Creek Rd, Forest Grove, OR 97116
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #452 (Oregon Department of Environmental Quality, verify)
From their website: Installation · Repair · Drain field · Perc testing
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HI-Line Construction
5848 NW Gales Creek Rd, Forest Grove, OR 97116
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3530 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Joshua VanderZanden
40543 NW Verboot Rd, Forest Grove, OR 97116
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #923 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Levi Parker
3121 Taylor Way, Forest Grove, OR 97116
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3498 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Parker Concrete, Inc.
3121 Taylor Way, Forest Grove, OR 97116
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3757 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3735 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Verboort Construction
4938 NW Visitation Rd, Forest Grove, OR 97116
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #711 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Sherwood 4
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Chad Cook Excavating Inc.
22164 SW Bushong Terrace, Sherwood, OR 97140
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #876 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Harris Excavation Inc.
21303 SW Hells Canyon Rd, Sherwood, OR 97140
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3434 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Paragon Excavation LLC
PO Box 1308, Sherwood, OR 97140
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3894 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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ReNew Handyman Services LLC
22554 SW Verdant Ter, Sherwood, OR 97140
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3398 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Gaston 3
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Chehalem Ridge Excavating LLC
38649 SW Fernwood Dr, Gaston, OR 97119
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #796 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Kingdom Construction & Consulting llc
38250 SW Laurelwood Rd, Gaston, OR 97119
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3999 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Kyle VanDyke
25670 NE Wapato School Rd., Gaston, OR 97119
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3396 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
North Plains 3
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HPS Construction, Inc.
10985 NW Cami Pl., North Plains, OR 97133
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3687 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Insight Sanitary Services
10801 NW Main St ST A, North Plains, OR 97133
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #985 (Oregon Department of Environmental Quality, verify)
From their website: Pumping · Drain field Per state license: Installation
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Scott Tankersley Construction LLC
18630 Nw Pumpkin Ridge Rd, North Plains, OR 97133
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1131 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Tigard 3
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Plumbing & Sewer Renewal Specialist
9350 SW Tigard St, Tigard, OR 97223
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3908 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Sewer Renewal Specialist
13385 SW Beef Bend Rd., Tigard, OR 97224
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3444 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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West Side Drain and Septic
9460 SW Tigard St Ste 102 A, Tigard, OR 97223
From their website: Pumping · Installation · Inspection · Drain field · Grease traps
Banks 2
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Pihl Inc
41660 NW Sunset Hwy, Banks, OR 97106
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3604 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3586 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1221 (Oregon Department of Environmental Quality, verify)
- +5 more credentials
Per state license: Installation
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Pihl Inc.
41660 NW Sunset Hwy, Banks, OR 97106
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1168 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1167 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Cornelius 2
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Bettinelli Excavation
36400 SW Dixon Mill Rd., Cornelius, OR 97113
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3986 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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VanDyke Excavating
35490 NW Wren Rd, Cornelius, OR 97113
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #699 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Gales Creek 2
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Huson Excavation & Tree Service
11900 NW Gales Creek Rd, Gales Creek, OR 97117
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1086 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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L bar L Excavation Inc.
18103 NW Grimmett Dr., Gales Creek, OR 97117
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #4042 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Tualatin 2
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Edicott-Woods Enterprises, Inc
PO Box 1537, Tualatin, OR 97062
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #19 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
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Jacob Wark
21585 SW 75th Ave, Tualatin, OR 97062
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3561 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Aloha 1
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Precision Earthworks LLC
21150 SW Johnson St, Aloha, OR 97003
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3479 (Oregon Department of Environmental Quality, verify)
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #1265 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Manning 1
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Manning Construction LLC
20480 NW Pottery Ln, Manning, OR 97125
- Licensed: Oregon DEQ Certified Onsite (Septic) Installer · #3551 (Oregon Department of Environmental Quality, verify)
Per state license: Installation
Portland 1
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PDX Sewer Solutions
7886 SW Oak St, Portland, OR 97223
From their website: Repair
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 Washington 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 Washington County: common questions
How many licensed septic companies are in Washington County, OR?
51 septic companies serve Washington County, Oregon, and 48 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 pump septic tanks in Washington County?
5 of the 51 listings in Washington County offer septic tank pumping, either on their own website or under a state pumper license. Use the service filter above to show only those companies.
Which companies install septic systems in Washington County?
50 listings in Washington 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.