As-Builts, Locating and Digging - Serving King County & Pierce County, WA

KING COUNTY AS BUILTS, LOCATING & DIGGING

47+ Years of Experience
Certified OSM Firm
Fast Services Available

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

We Find It, Dig It, and Document it

Fast, Accurate, and Reliable Septic Locating & As-Built Services

At Lilly’s Septic Service, we specialize in septic system locating, as-built retrieval, and tank uncovering across King County, WA and surrounding areas. With over 48 years of hands-on experience, our expert team ensures every system is located accurately, safely, and without unnecessary digging or property damage.

Our licensed Master Installers and Certified On-Site System Maintainers (OSM) have direct access to county records and advanced locating equipment — so even if you don’t know where your system is, we’ll find it fast. From retrieving official King County as-built drawings to precisely uncovering buried lids for inspections or pumping, we handle it all.

We take pride in no-damage, precision locating, keeping your yard intact while providing the detailed mapping and documentation you need. Whether you’re selling your home, preparing for repairs, or scheduling maintenance, you can count on our fast response times, fair pricing, and guaranteed results.

Call or text Lilly’s Septic Service today for expert septic locating, digging, and as-built assistance — your trusted King County professionals since 1978.

Importance of Accurate As-Builts, Locating & Digging

Knowing exactly where your septic system is located is critical for maintenance, repairs, and property sales. Without proper records or accurate locating, homeowners risk costly digging mistakes, system damage, or even permit delays.

At Lilly’s Septic Service, we use advanced locating equipment and King County-approved mapping standards to find, expose, and document your system precisely — saving you time, stress, and unnecessary excavation.

Accurate Locating, Every Time

Know before you dig. We use precision equipment and county mapping to pinpoint your system components — eliminating guesswork and preventing unnecessary yard damage.

As-Builts That Actually Pass County Review

Done right the first time. Our detailed, scaled as-built drawings meet King and Pierce County requirements — ensuring your submittal gets approved without costly revisions or rejections.

Avoid Costly Mistakes & Re-Excavation

Protect your property and your wallet. Many old as-builts are inaccurate or incomplete, causing failed inspections and unnecessary digging. We locate and verify every line, lid, and tank before you ever break ground.

Minimize Yard Disturbance

We dig smart, not deep. Our technicians use precise excavation methods to expose system components with minimal disruption — saving landscaping, time, and cleanup costs.

Fully County-Compliant Documentation

Approved and on record. We handle every step — from field locating to drawing submission — so your as-built package is ready for health department approval and future property reference.

Trusted by Homeowners & Contractors Since 1978

Experience that pays for itself. With over 45 years in King and Pierce County, Lilly’s Septic Service delivers fast, accurate locating and documentation that prevents problems before they start.

Why Choose Lilly's Septic Service?

Over 48 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.