If you are looking for a hassle-free septic tank installation or replacement experience, Mainstream is the best choice. We’ve been doing this since 2000 and have all the expertise and equipment to finish most jobs on the spot. Whether you book us for the future or need same-day service, we’re glad to help.

Septic tanks can be made from plastic, fiberglass, concrete, or stainless steel. With four different materials to choose from, it can be difficult to know which is best for your home. Our technicians are experts at creating a personalized septic tank proposal, including the material, system, and size, based on your home’s needs. The following includes the different types of septic tank systems we offer:

We Make Choosing a Septic Tank Easy



Sand filter


Pressure distribution

We pride ourselves on our excellent communication, which is why we tell you your options first before we start any work. You can trust that you’ll receive the best advice and high-quality work when you schedule an appointment with Mainstream.

Check out why your neighbors trust us to get the job done right

Very Efficient

Donovan was extremely professional, offered common sense solutions and completed the work in 1/2 day less than we were quoted! He even took the time to mortar set the tub even though the instructions from Delta said it wasn't required. The attention to detail showed and the new bathroom will be great because of their efforts!
Joshua W.


Cody was respectful, personable, courteous, answered all our questions we had during his visit, knowledgeable. Cody helped us get in touch of the appropriate people, to finance the work that our home needs. He helped get the work scheduled so that we wont need to wait longer to get the work taken care of.
Crystal N.

Great Service

We had some plumbing work done by Mainstream. The plumber (Sam) they sent out was GREAT. He listened to what we wanted done; gave us advice about things that could become issues and was very conscientious. We took his advice about our 15+ year old water heater and replaced it. My husband raves about how great it is to have really hot water. We plan to have Mainstream do work for us in the future.
Theresa J.

Highly Recommend

The entire team was very responsive and nice. Handled scheduling quickly. Process was clearly outlined at multiple points in the job to ensure expectations were being met. Took 48 hours from time I reached out to complete issue resolution. Highly recommend
Jennil C.


Jaymin was very professional and friendly. Was knowledgeable and got right down to business. Did a great job! He deserves a KUDOS!! 👍 Daryl was also very professional and friendly. He was knowledgeable and explained the problem very clearly. He's also a good salesman! KUDOS to him, as well!! 👍
Judy W.


Our water heater was making noises it shouldn’t. Chandler was professional and very knowledgeable. He educated us on the issues and answered all of our questions. I recommend this company.
Lance U.

Excellent Work

Sam Smiley was our plumbing tech and he was amazing! Very professional and courteous. Did excellent work and had a great attitude. Thanks so much for your help today!
Beth V.

No Upsells

He was very nice, friendly, and professional, fixed my bathroom sink which I had not used for several months. He did ask about several other plumbing related issues, but never pressured or upsold me, was very happy with the experience
Benjamin C.
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Proudly Serving Spokane County and Northern Idaho for Over 20 Years

We are proud to have serviced Spokane and Northern Idaho for 20+ years and can’t wait to hear from you! Even if you are in the surrounding area, feel free to give us a call! We’ll be ready to set up an appointment to visit you.

Call (866) 411-9277, or feel free to fill out our contact form. Mainstream Electric, Heating, Cooling, & Plumbing is happy to answer your questions!

Special Offers in Spokane Valley, Washington

$79 Off Any Repair

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