#1
Sapphire Waterworks
“Kelsey from Sapphire Waterworks brought by a filter to our house and was very friendly and knowledgeable. She took the time to answer all of our questions and explained everything in a way that was easy to…” — Google review
Best Water Treatment Services in Missoula, MT
The 4 best-rated water treatment services in Missoula, MT average 4.9★ on Google across 117 reviews. Sapphire Waterworks has the top rating (5.0★). Updated October 26, 2026.
4 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (117 reviews combined) and currently operating. Request a call back and the company will phone you directly.
#2
Z Water Solutions LLC
“Zac was professional, responsive, and able to shop around and get us the best price on our arsenic filter install. He laid out all of his fees up front so there were no surprises. The best part, a person answers the…” — Google review
#3
R D Water Lab, LLC
“I’ve used RD Labs for over five years to perform high-quality water testing for my clients, as well as for my own personal well. They are consistently reliable, professional, and thorough. Excellent company—highly…” — Google review
#4
Crisp Water Technologies, Inc.
“Ken Crisp and his TEAM is always great to work with. From the office to the on-site service install team, crisp water is the right choice to make for your water purification needs. They are professional, clean and…” — Google review
How we pick water treatment services in Missoula
We scan Google Maps for water treatment service listings in and around Missoula, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Frequently asked questions
Who is the highest-rated water treatment service in Missoula?
Sapphire Waterworks has the highest Google rating on our Missoula list: 5.0 out of 5 from 43 reviews (as of October 26, 2026).
Which water treatment service in Missoula has the most reviews?
Sapphire Waterworks has the most Google reviews among the companies listed here: 43, with a 5.0★ average.
How are these water treatment services chosen?
Only open Missoula-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.