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Top-Rated Water treatment & purification system installers and replacers in Seattle - Updated Nov 2026

Avatar for Water Doctor of Washington
Water Doctor of Washington
4.6(
68
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 1997

Free estimates

Warranties offered

"We are so happy we had The Water Doctors install our Kinetco water softener system in our Shelton Washington home. We put off having a water treatment system when the first company wanted over $8000 for a electric system. The Kinetco system is much less expensive and uses clean water to flush. We have noticed the significant difference already. Shane and one other installer arrived on time and took just about 3 1/2 hours to install with water being secured for only a few minutes. Shane did an awesome job explaining the system and how to take care of it. When all was done there was no mess and fresh clean water in our home."
Customer on city water
2060s OD Installation in Garage
Whole system installed cleanly in the Garage
Response time10 hrs
56 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Harts Plumbers, Electricians, & HVAC Technicians
Harts Plumbers, Electricians, & HVAC Technicians
4.6(
1,468
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Emergency services offered

Warranties offered

"I had a hot water leak and he came out gave me a quote and replaced it next day upon my request. And I'm still waiting on the quote from the other two plumbing outfits. If you need quick and timely service and good personnel go with these guys. The two guys that gave me the quote were installers as well so they know what they are talking about."
Prep Area
Waterfall Finished!
Excavation jobs and more!
 install grease trap for commercial kitchen
Delivery of Shoring

+334

39 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Harts Plumbers, Electricians, & HVAC Technicians
Harts Plumbers, Electricians, & HVAC Technicians
4.6(
1,044
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2013

Emergency services offered

Warranties offered

"Service came to my house within 30 minutes of me contacting them to them to replace my broken water tank with an O.A. Smith brand. The person took the time to educate me about what had to be done to replace the hot water tank and why it needed to be put in a certain way. Person also took the time to teach me how to maintain the hot water tank. Their man office stayed in touch with me during the installation and followed up afterwards to be sure I was satisfied with every aspect of the installation process."
Before the Extension
After Extension
Recommended by92%of homeowners
Avatar for Northwest Water Systems, Inc.
Northwest Water Systems, Inc.
4.5(
12
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 1972

Free estimates

Emergency services offered

"Chris was awesome! Great price, great customer service, and did an excellent job with the installation. Chris was even kind enough to videotape a system walkthrough for future maintenance and explanation of the water system. Would recommend to anyone looking for a quality water filtration system with zero hassle!!"
Submersible pump repair
Submersible pump Repair
Subersible pump repair
Duckworth Pump & Well Truck
Duckworth Pump & Well Truck & Glenn

+5

Response time3 days
6 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Robison Plumbing Service Inc
Robison Plumbing Service Inc
4.3(
112
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 1986

Emergency services offered

Warranties offered

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

10 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for SIMBA SOLUTIONS CO LLC
SIMBA SOLUTIONS CO LLC
4.7(
19
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

"Absolutely fantastic service!!! Jason did an amazing job installing our new tankless water heater, and the whole experience was smooth and stress-free. He took the time to answer all our questions, made sure everything was set up perfectly, and left the workspace spotless. You can tell he takes pride in his work. We?re beyond happy with the results and grateful for the excellent service"
Simba plumbing
Simba plumbing
Simba plumbing
Simba plumbing
Simba plumbing

+29

1 neighbors recently requested a quote
Avatar for Pro Works, LLC
Pro Works, LLC
5.0(
2
)
Water Treatment & Purification System - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2022

Emergency services offered

Small jobs welcome

Daniel Ramirez is the top choice for all of your plumbing needs. With over 10 years experience, I'll take great care of you. I take pride in my customer satisfaction. Call today. You will be taken care of the way you want to be.

Block wall and wire fence
Block retaining wall and
Response time1 day
1 neighbors recently requested a quote
Recommended by100%of homeowners
Showing 1-10 of 46

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