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Top-Rated Water treatment pros in Longview - Updated Nov 2026

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

Serving Longview, WA and surrounding areas

Approved

In business since 1997

Free estimates

Warranties offered

"Very pleased with the service provided. The installation of my water treatment system was put in quickly and clean. The personal were professional and well informed. Highly recommend their services."
Customer on city water
2060s OD Installation in Garage
Whole system installed cleanly in the Garage
Response time10 hrs
62 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Service Pro Plumbing
Service Pro Plumbing
5.0(
10
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

Approved

In business since 1999

Emergency services offered

Warranties offered

Welcome to Service Pro Plumbing, where faith, integrity, and exceptional service come together!\n\nAs a family-owned and operated plumbing company proudly serving Clark and Cowlitz Counties, we believe every customer deserves honest communication, quality workmanship, and genuine care.\n\nWith over 1,300 five-star reviews, we've earned our reputation by putting customers first, delivering dependable solutions, and treating every home like our own.\n\nFrom water heater repairs and installations to drain cleaning, leak detection, sewer services, repiping, and complete plumbing solutions, our experienced team is ready to help.\n\nNeed a plumber fast? We offer same-day or next-day service availability to get your home back to normal quickly!\n\nAt Service Pro Plumbing, we're not just fixing plumbing problems. We're building lasting relationships through integrity, professionalism, and service you can trust.\n\nExperience the Service Pro difference!

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+16

Response time7 hrs
Response rate100%
1 neighbors recently requested a quote
Avatar for Simpson Plumbing, LLC
Simpson Plumbing, LLC
4.6(
128
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

In business since 1980

Free estimates

Emergency services offered

"They called me when they were on their way to my house and arrived promptly. They fixed everything quickly and explained the problem to me. They also visibly checked the water shutoff in the house, in the garage and talked to me about the efficiency of these, or inefficiencies."
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+8

Recommended by90%of homeowners
Avatar for Culligan of the Pacific North West Inc
Culligan of the Pacific North West Inc
4.8(
20
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

In business since 1936

Free estimates

Emergency services offered

"I have very hard water and wanted a unit installed. I called Ecowater Northwest because they were local and had excellent ratings on Angie's List. Aaron came to my house, answered all my questions, tested my water and recommended the two units I had installed. Dave did the installing and did an excellent job. I am very happy with the results and would recommend them to anybody that needs this type of service."
Culligan HE Softener
Culligan HE Softener
Culligan Aqua Cleer Drinking Water System
Recommended by93%of homeowners
Culligan
3.8(
45
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

In business since 1936

Free estimates

Emergency services offered

"I love my Culligan Twin Water Softener and AC-30 Reverse Osmosis. We have the best water available, soft water for laundry and bathing and great tasting Reverse Osmosis for drinking and cooking. The people at Culligan are wonderful. I would recommend this company to everyone. Quality products, fair price, and friendly service. I give Culligan an A+"
total home
Aqua-Cleer
Medallist Series
Bottled Water
gold series

+12

Recommended by94%of homeowners
Avatar for Cascade Clean Water LLC
Cascade Clean Water LLC
5.0(
5
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

In business since 2023

Emergency services offered

Credit card accepted

"Christian came out diagnosed water heater found it was 20 years old and suggested replacing with new Bradford white brand water heater with ten year factory warranty realy liked that he gave me different options on wat to do and did the new install same day, we could not be happier, definitely will be referring him to freinds and family"
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+3

Recommended by80%of homeowners
Avatar for Lake's General Contracting
Lake's General Contracting
4.9(
8
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

In business since 2018

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Our mission at Lakes General Contracting is to continue the growth of our business by doing right by all of our clients. We love seeing that one of a kind smile on a home owners face at the end of a project! Lake's General Contracting stacks up with the competition and surpasses it with competitive prices, second to none workmanship and a prompt/responsive team! We give you quality that you can measure, and a finished product that will enhance your home forever. Call us today!

Recommended by100%of homeowners
Avatar for Choice Home Warranty
Choice Home Warranty
4.0(
5,678
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Longview, WA and surrounding areas

In business since 2008

Emergency services offered

Credit card accepted

"Great! This was through home warranty plan. It was a simple matter of the water backed up in the water pan which caused the stopper to disconnect it. The technician knew immediately what it was, he cleaned out the line and the pan and checked everything else to make sure it was working. This is an older system so I was glad he was so thorough and there was no upselling of service, etc."
Recommended by81%of homeowners
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