Septic System Installation - Serving King County & Pierce County, WA

New & Replacement Septic System Installation

47+ Years of Experience
Certified OSM Firm
Fast Services Available

Call (425) 432-3084
or
Text (425) 437-2534

Expert, Efficient, and Reliable Septic System Installations

At Lilly’s Septic Service, we provide professional new septic system installations across King and Pierce County, WA. With over 47 years of hands-on experience, our team designs and installs systems that perform flawlessly — built to meet county standards and last for decades.

Our licensed Master Installers and Certified On-Site System Maintainers (OSM) work closely with engineers, designers, and local health departments to ensure every installation is compliant, efficient, and tailored to your property’s needs. From start to finish, we handle permits, coordination, and final approval, making the process completely stress-free.

We take pride in clean, precise, and professional installations, keeping your property organized and job sites spotless while delivering systems that function perfectly from day one. Whether it’s a new build, full replacement, or advanced treatment system, you can trust us for honest pricing, dependable service, and guaranteed quality.

📞 Call or text Lilly’s Septic Service today for expert septic system design and installation in King County, Pierce County, and surrounding areas — your trusted local installers since 1978.

Importance of Properly Installed Septic System

A septic system is one of the most critical — and permanent — parts of your property. A poorly designed or incorrectly installed system doesn’t just fail early; it can destroy your drainfield, contaminate your soil, and even make your property unlivable.

At Lilly’s Septic Service, we’ve seen the costly damage left behind by unlicensed or inexperienced installers — tanks buried too deep, drainfields built in the wrong soil, and systems installed without proper county approval. When space on your property is limited, one bad install can eliminate your only viable location for a replacement system, permanently reducing your property’s value and future usability.

With over 47 years of experience, our Master Installers ensure your system is done right — fully compliant, professionally engineered, and built to last for decades. We handle every phase of the process, from design and permitting to installation and inspection, so you can trust your investment is protected.

💡 Your septic system isn’t something you get a second chance to fix — make sure it’s installed by experts who stand behind their work.

📞 Call or text Lilly’s Septic Service today to schedule your new septic system installation in King or Pierce County — and protect your home, land, and peace of mind.

Designed for Long-Term Reliability

Built to last for decades. Every septic system we install is engineered to county standards, ensuring proper function, efficient drainage, and maximum system lifespan.

Fully Compliant & County Approved

Installed right the first time. We handle all permitting, design coordination, and county approvals to guarantee your system meets or exceeds all King and Pierce County requirements.

Protects Your Property Value

A bad install can cost you everything. Poorly installed systems can contaminate soil, flood your yard, or make your property unlivable. Our expert installations protect your investment — and your land’s future usability.

Tailored to Your Property

Custom solutions for every site. From compact lots to complex rural properties, our team designs and installs systems that fit your soil type, layout, and long-term needs.

Clean, Professional Installation

No mess. No damage. No stress. We take pride in precise, organized work — keeping your property neat while delivering a system that’s installed efficiently and correctly.

Trusted by Homeowners Since 1978

Experience you can depend on. With over 47 years in the industry, our family-owned and locally operated company has earned a reputation for honesty, craftsmanship, and reliable results.

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Why Choose Lilly's Septic Service?

Over 47 Years of Industry Experience

With decades of hands-on experience, we’ve seen and solved it all — delivering reliable, professional septic service across King County and beyond.

Family & Locally Owned

Since 1978, our family has proudly served King County and surrounding communities, delivering honest, reliable service backed by small-town care and big-time expertise.

Licensed Master Installers

Our licensed Master Installers bring unmatched skill and precision to every system — from simple pumps to complex installations.

Certified OSM Firm

As a Certified On-Site System Maintainer, we’re licensed to inspect, maintain, and report your system to meet King County requirements.

Accurate System Records

No need to guess where your tank is — we can locate it using verified county records and mapping tools for a quick, efficient service.

Clean & Organized Work

We take pride in a clean, no-mess job site and treat your property with the same care and respect we’d want for our own.

CONTACT US

For reliable and professional septic pumping in Kent, WA and surrounding areas, trust Lilly’s Septic Service. Whether you need routine maintenance or emergency assistance, our team is ready to help. Get in touch with us to discuss your needs and schedule an appointment. In most cases, services can be provided within a week.