9 verified septic companies across 4 cities in Mason County. Compare ratings, services, and request free quotes from local providers.
Mason County, Washington is home to a diverse mix of rural properties, forested lots, and waterfront communities along Hood Canal and the southern Puget Sound shoreline — settings where private septic systems are the norm rather than the exception. This directory lists 9 verified septic service companies operating across 4 cities and towns in the county, giving property owners a straightforward way to find local help for pumping, inspection, installation, and repair. Because much of Mason County lies outside municipal sewer service areas, functioning septic systems are essential infrastructure for a large share of residents. The county's combination of heavy rainfall, clay-heavy soils in some areas, and high seasonal water tables makes routine maintenance especially important. Whether you own a cabin near Lake Cushman or a year-round home outside Shelton, connecting with a qualified local septic professional is a practical step toward protecting your property and the surrounding environment.
Belfair, WA
⭐ 5.0 (23 reviews)
Quality Septic & Excavation specializes in providing top-tier septic services, focusing on expert installations and thorough inspections. With a commitment to quality, this company ensures that all septic systems are installed correctly and maintained through detailed inspections, promoting long-term functionality and compliance. They are dedicated to educating their clients on septic system best practices, empowering homeowners with the knowledge to care for their systems effectively. Quality Septic & Excavation prides itself on delivering reliable and professional service, making them a trusted partner for all septic installation and inspection needs. Their team is ready to assist with new system setups and routine checks to ensure optimal performance and prevent future issues.
Belfair, WA
⭐ 5.0 (17 reviews)
R&S Septic Solutions is a trusted, family-owned septic company based in Mason County, WA, serving homeowners and businesses in areas like Belfair, Allyn, Grapeview, Shelton, Union, Hoodsport, and Tahuya. They specialize in professional septic pumping, septic tank cleaning, and routine maintenance for systems of all sizes, including RV holding tanks. Their services include effluent filter cleaning, tank locating, and riser installation, with every job providing full county-required pumping reports. R&S Septic Solutions is licensed, insured, and county-approved, offering fast response times, transparent pricing, and dependable service. They also provide emergency septic pumping, ensuring systems run safely, efficiently, and affordably. Customers can schedule pumping or inspections to keep their septic systems clean and trouble-free.
Shelton, WA
⭐ 4.9 (436 reviews)
AAA Septic LLC provides septic system services in Western Washington, operating since 1993. The company serves Mason County, Grays Harbor County, Jefferson County, Thurston County, and Kitsap County from their Shelton, WA location. Their services include septic tank pumping, operations and maintenance (O&M) inspections, septic repairs and riser installation, septic line camera inspection and jetting, home sale septic services, and RV and holding tank pumping. The company also offers portable res
Belfair, WA
⭐ 4.7 (221 reviews)
FloHawks Plumbing and Septic provides comprehensive plumbing and septic tank services in Belfair, WA, and surrounding areas. They offer a wide range of septic services including septic tank inspections, pumping, installation, repair, and replacement, as well as drain field services. FloHawks also handles commercial and industrial pumping, catch basins, and grease traps. Their team of highly experienced and professional technicians is dedicated to providing exceptional service and value. They are available 24 hours a day, 365 days a week, ensuring prompt assistance for urgent plumbing and septic problems. FloHawks is known for reliable and professional service, catering to both residential and commercial customers with their world-class expertise.
Shelton, WA
⭐ 5.0 (4 reviews)
F&S Construction and Septic LLC is a locally owned and operated septic and construction company serving Shelton, Mason County, and surrounding counties in Washington State. The company is co-owned by Jennifer Fox and Joseph Stoffel, bringing together entrepreneurial leadership and hands-on construction expertise. Joseph Stoffel is a licensed and certified septic specialist who performs detailed septic system inspections to ensure compliance with safety and environmental standards. The company also offers reliable septic tank pumping to keep systems clean and fully functional. Beyond septic services, F&S handles a wide range of construction work including custom home builds, full home remodels, additions, roofing and roof replacements, siding, decking, interior and exterior painting, commercial renovations, and general household maintenance. Clients can expect clear communication, tailored solutions, and skilled craftsmanship on every project. Jennifer Fox is recognized as a Top 40 Under 40 business owner in the region, reflecting the company's strong roots and commitment to the local community. F&S Construction and Septic can be reached by phone at 360-229-1220 or by email at [email protected].
Grapeview, WA
⭐ 5.0 (3 reviews)
Union, WA
⭐ 5.0 (3 reviews)
Arrow Septic Designs, Inc. provides professional septic design services in Mason County, leveraging over 40 years of experience. This second-generation, family-focused company specializes in streamlining projects from site layout and septic design to permit approval. They also offer referrals to professional service providers and certified septic installers, ensuring clients receive comprehensive support throughout the entire septic process. Arrow Septic Designs is dedicated to producing economical, quality designs that meet client needs and comply with all state and local regulations. Their commitment to long-term relationships and community ties makes them a trusted choice for septic design needs. They guide clients through a clear process, starting with a project checklist and phone consultation to move projects from theoretical to physical. While they mention septic tank maintenance and pumping, their core service is design, and they refer out for pumping services.
Shelton, WA
⭐ 4.1 (45 reviews)
B-Line Construction, Inc. is a family-owned septic and construction company based in Shelton, WA, serving Mason County since 1991. With over 25 years of experience, the company offers a comprehensive range of septic services including septic pumping, septic inspections, O&M certified inspections, septic locating, septic design and installation, tank patching and replacement, and repair work. In addition to septic services, B-Line Construction handles new home construction, home demolition, remodeling, land clearing, excavation, driveway building, site preparation, utility ditching, and road construction. A key differentiator is that B-Line performs all of its own site work, septic design, installation, and home builds in-house, giving customers a single experienced contractor responsible for every phase of a project from start to finish. The company also provides after-the-fact as-built septic system designs for older systems with incomplete records. As a locally rooted, family-operated business committed to quality materials and craftsmanship, B-Line Construction is a trusted choice for residential and land development projects throughout the Shelton and Mason County area. Contact them at 360-426-4221.
Belfair, WA
⭐ 3.7 (3 reviews)
Mason County's septic landscape reflects its largely rural and semi-rural character. Many homes in the county — particularly those built before the 1980s — rely on older conventional gravity-fed systems, which can require more frequent attention as components age. Newer construction and properties with challenging soil conditions more commonly feature pump-up or pressure-distribution systems that move effluent to the drain field mechanically. In low-lying areas near Hood Canal or seasonal wetlands, alternative systems such as mound or drip-irrigation designs may be required to meet setback and soil absorption standards. The region's wet winters and persistently moist soils can stress drain fields if systems are not properly maintained or if excess water enters the tank. Seasonal population increases at vacation and waterfront properties can also create higher-than-usual loads on systems that were sized for part-time use, making periodic inspection a sound practice for second-home owners.
Septic system permitting and oversight in Mason County, Washington falls under the jurisdiction of the Mason County Public Health department, which administers on-site sewage system regulations in accordance with Washington State rules — primarily Washington Administrative Code Chapter 246-272A, which governs on-site sewage systems statewide. Homeowners typically need a permit for new system installation, major repairs, or significant modifications; routine pumping generally does not require a permit. At the point of sale, Washington state encourages — and in some circumstances requires — a system inspection, and lenders or buyers may request an inspection as a condition of the transaction. Mason County Public Health maintains records of permitted systems, which can be useful when purchasing an older property or when a system's history is unknown. To find current application forms, inspection requirements, and any local amendments to state rules, contact the Mason County Public Health department directly. Always verify current requirements with your local health department.
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