SEPTIC SERVICE IN KENT, WA & SURROUNDING AREAS
47+ Years of Experience
Certified Installers & OSM Firm
Fast Services Available
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Septic Pumping & Cleaning
Reliable, affordable septic tank cleaning to keep your system healthy and worry-free. Our team safely removes waste, checks for early warning signs, and keeps your system flowing like it should.
Home Sale Septic System Inspections
Buying or selling a home? Our licensed inspectors handle all county-required septic evaluations, ensuring your system meets standards and your sale moves forward without delays.
Septic System Installation
Need a new septic system or replacement for a failed system? We design, install, and fix all types of systems—so your home stays safe, clean, and worry-free. With over 47 years of experience, we do it right the first time!
Septic System Repair & Restoration
When your septic system starts to fail, Lilly’s Septic Service brings it back to life. Our certified experts repair damaged tanks, lines, and drainfields using proven restoration methods that restore full function & prevent costly replacements,
#1 Most Trusted Septic Experts in the PNW
From inspections to full system installs, Lilly’s Septic Service is King County’s trusted choice for reliable, high-quality septic work. We proudly serve homeowners in Kent, Renton, and surrounding areas, delivering fast service, fair pricing, & lasting results you can count on.
- 100% Satisfaction Guarantee
- 47+ Years in Industry
- Licensed & Certified Experts
- Super Fast Response Time
Comprehensive Septic Services You Can Count On
From inspections and pumping to full system installations and repairs, we provide everything you need to keep your septic system running safely, efficiently, and up to code.
Why Work With Us
Trusted Experts Since 1978
Decades of hands-on experience and proven results.
Fast, Reliable Service
Same-week scheduling and 24-hour turnaround on reports.
Licensed & Certified Pros
Master Installers and OSM-certified technicians.
Clean, Honest Work
No mess, fair pricing, and guaranteed satisfaction.
We Don’t Hide Our Work. We Put It On Display
We Could Tell You How Great We Are - But Our Clients Do It Better
Locations We Serve:
From Kent to Renton and throughout King County, Lilly’s Septic Service provides trusted septic care for homes and businesses across the Puget Sound region.
- Auburn, WA
- Black Diamond, WA
- Bonney Lake, WA
- Buckley, WA
- Carnation, WA
- Covington, WA
- Cumberland, WA
- Des Moines, WA
- Duvall, WA
- Edgewood, WA
- Enumclaw, WA
- Fairwood, WA
- Fall City, WA
- Federal Way, WA
- Graham, WA
- Hobart, WA
- Issaquah, WA
- Kent, WA
- Lake Tapps, WA
- Maple Valley, WA
- North Bend, WA
- Orting, WA
- Pacific, WA
- Preston, WA
- Puyallup, WA
- Ravensdale, WA
- Redmond, WA
- Renton, WA
- Sammamish, WA
- SeaTac, WA
- Snoqualmie, WA
- South Hill, WA
- Sumner, WA
- Woodinville, WA
Frequently Asked Questions?
How often should I have my septic tank pumped in King County, WA?
Most King County homeowners should pump their septic tank every 3 to 5 years, depending on household size and water use. Regular pumping prevents backups, system failures, and costly repairs — and it’s required by King County Health Department regulations for compliance.
Do I need a septic inspection when selling my home in King County?
Yes. King County requires a Time-of-Sale (TOS) septic inspection before a property can be sold. Lilly’s Septic Service provides fast, compliant inspections with same-day filing so your sale closes smoothly.
What are signs that my septic system needs service?
Watch for slow drains, sewage smells, wet spots, or gurgling pipes. These are early warning signs of a full or failing system. If you notice any of these, call Lilly’s Septic Service right away for an inspection or pumping. It’s always good however to stick to a preventative schedule so these issues don’t arise!
How long does a septic system last in the Washington?
A well-maintained septic system in Western Washington can last 25–40 years or more. Regular inspections, pumping, and avoiding harsh chemicals will extend your system’s life and prevent expensive replacements.
Can you replace just the septic tank or do I need a full new system?
In many cases, we can replace just the tank if the drainfield is still working properly. We’ll evaluate your system during inspection and design the most cost-effective solution — whether it’s a simple tank swap or a full system upgrade.
How much does septic tank pumping cost in King County, WA?
Typical residential pumping costs range from $500–$800, depending on tank size, accessibility, and waste volume. We always provide upfront, flat-rate pricing with no hidden fees. (We also often beat all competitors on price)
What’s included in a septic inspection by Lilly’s Septic Service?
Our inspection includes:
- Locating and uncovering your tank
- Checking sludge/scum levels
- Inspecting baffles and filters
- Testing pumps and floats
- Reviewing drainfield performance
- Filing a full county-approved report
We also include a free peace-of-mind system check with every service.