Gene Johnson Plumbing
Verified Pro
26½+ years online4.8(4173)
Water Treatment & Softeners in Seattle, WA
Compare 36 water treatment & softeners contractors near you in Seattle and surrounding area with an average rating of 4.7/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated May 14, 2026
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Verified Pro Installers
Other Businesses in This Area
PureSpring Water Softeners & Filters
3 years onlineWellness Water Filtration Systems
5½+ years onlineArtesian Bottleless Water
5.0Clear Water Services
5.022½+ years onlineEvergreen Water Treatment Northwest
5.02+ years onlineHydroFLOW USA
5.0~16 years onlineKangen Water
5.023 years onlineKD Water Systems, LLC
5.0~9 years onlineProduct Water / Rain Systems / Seattle
5.017+ years onlineSweetwater LLC
5.0~22 years onlineWater Heater Doctor
5.011+ years online2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air
4.98½+ years online5 Microns Inc. Asbestos, Mold, Drinking Water, Radon, Air Quality Testing Lab
4.9Alcorn Pump & Water Filtration
4.97½+ years onlineEco Electric, Plumbing, Heating and Air
4.9~9 years onlinePuget Seattle Plumbers and Drain Cleaning Co.
4.9Fox Plumbing, Heating & Cooling (now a Gene Johnson company)
4.8~27 years onlineGarrett & Sons Water Heaters
4.8Green Planet Plumbing & Sewer, LLC
4.819½+ years onlineMr. Rooter Plumbing of Seattle
4.830+ years onlinePure Water NorthWest
4.810½+ years onlineMeadow Lake Water Treatment
4.626+ years onlineRoto-Rooter Plumbing & Water Cleanup
4.6~29 years onlineThe Fish Store
4.615½+ years onlineBeacon Plumbing, Heating, Electrical & Mechanical Inc - Seattle
4.523½+ years onlineAquametrics LLC
4.4~18 years onlineKeller Supply
4.430 years onlinePacific Plumbing Supply Company LLC - Administrative Office
4.329 years onlineHydrotonix Water LLC
2.3Water Treatment & Softeners in Nearby WA Cities
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Water Treatment & Softeners in Seattle, WA
Water treatment and softeners in Seattle serves a Puget Sound market: Victorian and Craftsman homes, modern condos, single-family, and commercial properties. Typical jobs include whole-home water softeners (Seattle water relatively soft but variable), reverse-osmosis drinking-water systems, and commercial water treatment for tech-industry. Pacific NW soft water and tech-demographic drive approach.
Residential water softeners in Seattle run $2,500-$5,500; reverse osmosis $1,500-$4,000; commercial $5,000-$50,000. Washington requires a Plumber Certification. Seattle permits apply.
Frequently Asked Questions
- Is Seattle water hard?
- Variable — some areas soft, others moderate. Testing recommended.
- RO for drinking?
- Popular with tech-industry households. $1,500-$4,000.
- Commercial tech-industry treatment?
- Cooling tower and process water for data centers.
About NeedInstall
NeedInstall helps connect customers with local installation professionals across Seattle and surrounding communities. Featured contractors have claimed their profile and verified their business information. Listings marked as "Verified Pro" have been confirmed by the business owner.