Welcome To Lilly's Septic Tank Services Website!

If you are looking for first-class Septic System Service, you have come to the right place! We aim to be friendly and approachable.

We are here to serve all of your Septic System needs and answer any questions you may have. 

Call us today (425) 432-3084  (253) 639-3606  (360) 825-4809

We put our customers first. We listen to you and help you find answers to all of your Septic System questions. Give us a call, we are here to help solve all of your Septic System concerns.

We are the only Septic Company in the Northwest who can perform any Septic service needed.  We are licensed as a Professional Septic Tank Pumping Firm, Professional Operation and Maintenance certified Sale Inspection Firm, Certified Master Installer for all of your repairs, Pump Alarm calls, pump replacements,  sale inspection repairs. Our Staff is knowledgeable in all aspects of your Septic System.  We have been proudly serving homeowners in the Northwest since 1978.  We are family owned and operated and consider each and every customer as part of the Lilly's Family!


You can count on Lilly’s Septic Tank Pumping and Inspections for:


Lilly’s Septic Service, provides quality environmentally conscious expert Septic Tank Pumping & Septic System Installation services to residential and commercial clients in King & Pierce Counties.

We proudly provide the best customer service in the industry!  Since 1978, Lilly’s Septic Services has provided its clients with quality, expert and thorough service. Based in King County, Lilly’s handles both residential and commercial jobs ranging from Septic Tank Pumping and Cleaning, King County Home Sale Inspections, Certified As-Built Drawings, Locating and Digging Septic Tank lids, Inspection Repairs, Septic Pump Alarm Calls, Pump Replacements.

Septic Tank Pumping

As an environmentally conscious company, Lilly’s Septic Service guarantees satisfaction. Our company is a member of the National Onsite Wastewater Recycling Association (NOWRA) and the Washington Onsite Sewage Association (WOSSA).

Darren McCullough, Owner and Operator is a Certified Septic System Professional, King County O&M (Real Estate Sale Inspections) and a Certified Master Installer in King, Pierce, Snohomish & Kittitas Counties.

Thank you for stopping by our website! I’m sure you will find an abundance of helpful information and resources here for you Septic System Needs. If you have questions and/or would like to book an appointment for Septic Services give us a call


Call Today To Book Your Septic System Services

(425) 432-3084  (360) 825-4809  (253) 639-3606



Lilly's Septic Tank System Pumping Services

Maple Valley Wa 98038