6 verified septic companies across 5 cities in Washington County. Compare ratings, services, and request free quotes from local providers.
Washington County, Oregon is one of the state's most populated counties, stretching from the urban corridors of the Tualatin Valley to rural foothills at the edge of the Coast Range. This directory lists 6 verified septic service companies operating across 5 cities and communities in the county, connecting homeowners and property managers with local providers for pumping, inspection, installation, and repair. Because Washington County includes a notable mix of newer suburban subdivisions and older rural properties outside municipal sewer service areas, demand for private septic system maintenance remains consistent throughout the region. The county's wet winters and clay-heavy soils in certain areas can affect drain field performance, making routine maintenance particularly important for property owners on private systems in unincorporated parts of the county.
Cornelius, OR
⭐ 5.0 (167 reviews)
West Side Drain and Septic is a family-owned septic and drain service company based in Portland, OR, with over 16 years of hands-on industry experience. The company offers a comprehensive range of services including septic pumping, septic inspections, septic installation and repair, drain field service, drain cleaning, sewer cleaning and repair, sewer video inspection, grease trap pumping, lift station service, catch basin cleaning, RV pumping, gray water pumping, and alternative treatment technologies. West Side Drain and Septic provides 24-hour drain cleaning, meaning customers can count on around-the-clock availability for urgent needs. As a locally owned business, they emphasize honest communication, fair pricing, and showing up on time with fully stocked trucks capable of handling most jobs on the spot. The company has earned 750-plus five-star reviews and takes pride in serving the communities where their team members live and work. Customers speak directly with knowledgeable staff rather than a call center, making for a straightforward and trustworthy service experience.
Tigard, OR
⭐ 5.0 (84 reviews)
West Side Drain and Septic offers comprehensive septic and drain solutions in Portland, OR, with over 16 years of experience. They provide a wide range of services including septic pumping, installation, repair, and inspection, as well as drain field services and grease trap pumping. The company also handles alternative treatment technologies, lift station services, and RV pumping. They are known for their prompt, professional, and precise service, offering around-the-clock drain and septic solutions. As a family-owned business, West Side Drain and Septic is committed to honest service, fair pricing, and treating properties with care, ensuring reliable and dependable work for both residential and commercial clients. Their trucks are fully stocked to solve most problems on the spot, and they pride themselves on clear communication and straight answers.
Lake Oswego, OR
⭐ 4.9 (936 reviews)
Hillsboro, OR
⭐ 4.7 (50 reviews)
Precision Earthworks LLC is a full-service excavation and septic company serving the Portland metro area and the Central and North Coast of Oregon. The company specializes in septic system design, installation, and replacement for both residential and commercial properties, alongside a broad range of related services including sewer repair, underground utilities, drainage solutions, site preparation, concrete and asphalt work, demolition, and retaining walls. Led by president Ryan McCain, who brings decades of hands-on excavation experience in the Pacific Northwest, Precision Earthworks is committed to upfront pricing, strong client communication, and on-time, on-budget project delivery. The team operates Monday through Saturday from 7:00 a.m. to 7:00 p.m. and offers 24-hour emergency service seven days a week. Residential and commercial clients are encouraged to reach out for a free project quote by phone or email. Precision Earthworks LLC takes pride in its glowing client references and a satisfaction guarantee that backs every project it undertakes.
Hillsboro, OR
⭐ 4.9 (180 reviews)
# West Side Drain and Septic West Side Drain and Septic is a locally-owned drain and septic service provider based in Hillsboro, Oregon, with over 16 years of industry experience. The company offers 24-hour emergency service and comprehensive solutions for residential and commercial properties, including septic pumping, septic installation and repair, drain cleaning, sewer repair, and video inspection services. Their service menu also covers specialized offerings such as drain field maintenance, lift station repair, grease trap pumping, and alternative treatment technologies. The company distinguishes itself through direct communication with knowledgeable local technicians rather than call centers, transparent pricing explanations, and fully-equipped service trucks capable of resolving most issues on-site. West Side Drain and Septic maintains a 4.9 Google rating based on customer reviews, reflecting their commitment to reliable, professional service. Their operations and maintenance contracts provide ongoing system monitoring for homeowners and businesses seeking preventative care solutions.
Beaverton, OR
⭐ 4.8 (46 reviews)
Black Rock Underground, LLC is a licensed sewer contractor serving the Portland metro area and Southwest Washington, including Hillsboro, Beaverton, Tigard, Lake Oswego, Oregon City, Milwaukie, Salem, Vancouver, and surrounding communities. With over 13 years in business, the company specializes in trenchless pipe bursting, sewer line replacement, and sewer scope inspections for residential, commercial, and municipal clients. Black Rock Underground is licensed in both Oregon and Washington and is trusted by hundreds of local real estate agents for pre-sale sewer inspections. The company provides fixed-price bids, detailed written scopes, and pre-estimate video inspections to ensure accuracy and transparency. Their trenchless pipe bursting method requires only two small access points, minimizing disruption to lawns, landscaping, and driveways. Most residential jobs are completed in a single day. Financing options are available for unexpected repairs. Black Rock Underground is known for honest communication, no high-pressure sales tactics, and leaving properties in the same or better condition than when work began.
Washington County's septic landscape reflects its varied development history. Older rural properties in unincorporated areas west and southwest of Hillsboro often rely on conventional gravity-fed systems installed decades ago, while newer developments in and around communities like Cornelius may include pressure-distribution or alternative systems required by more current permitting standards. The Tualatin Valley's relatively flat terrain can limit natural drainage in some locations, making pump-up systems more common than in hillier parts of Oregon. Seasonal rainfall from late fall through early spring keeps soil saturation levels elevated, which can stress drain fields and slow effluent absorption. Homeowners in these conditions are generally advised to avoid heavy water use during peak wet months and to keep up with regular pumping schedules to reduce the load on their systems year-round.
In Washington County, Oregon, septic system permits and oversight are handled through the Oregon Department of Environmental Quality in coordination with the county's land use and environmental health programs. Oregon uses a statewide onsite wastewater treatment program framework, meaning installers and designers must hold state-issued licenses, and new installations or significant repairs require a permit before work begins. At the point of a real estate transaction, many lenders and buyers request a septic inspection or evaluation, though Oregon does not mandate a universal point-of-sale inspection for all counties; local requirements and lender standards can vary. Homeowners looking to understand their specific obligations can consult the Oregon DEQ's onsite wastewater program resources or contact Washington County's Department of Health and Human Services for locally applicable guidance. Always verify current requirements with your local health department.
Get free quotes from verified septic companies serving Washington County, Oregon.
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