Coast Water Conditioning & Plumbing
Verified Pro
16½+ years online5.0(11)
Water Treatment & Softeners in San Diego, CA
Compare 24 water treatment & softeners contractors near you in San Diego and surrounding area with an average rating of 4.8/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated April 27, 2026
Most pros respond within 2–24 hours
Verified Pro Installers
Other Businesses in This Area
Arnett's Water Systems
5.011½+ years onlineSan Diego Pure Water
5.0~14 years onlineTriton Water Renewal LLC
5.0~10 years onlineTrusted Water Systems
5.0~5 years onlineVerday Smart Solutions
5.010½+ years onlineWellness Water Filtration Systems
5.02½+ years onlineAll Cities Water Treatment inc.
4.926½+ years onlineHigh Quality Water of San Diego
4.95½+ years onlineLifeSource Water Systems, Inc - San Diego
4.9~29 years onlineAllstar Water Systems
4.620+ years onlineCulligan Water of San Diego
4.4~14 years onlineSuperior Water Filtration Systems
4.428½+ years onlinePuretec Industrial Water
4.3~22 years onlineSoft Flow Water
3.06½+ years onlineWater Treatment & Softeners in Nearby CA Cities
Other Services in San Diego
Access Control & Intercom(42)Alarm System Installation(25)Appliance Installation(20)Artificial Turf Installation(20)Automotive Installs(5)Concrete & Paving(40)Deck & Patio Building(37)Electrical Services(26)EV Charger Installation(7)Fencing & Gate Installation(37)Fire Protection & Sprinklers(31)Garage Door Installation(25)
Water Treatment & Softeners in San Diego, CA
San Diego water-treatment contractors in this directory serve homes on San Diego municipal supply (treated, moderately hard at 9-13 grains) and surrounding well-water properties. A whole-home twin-tank water softener runs $1,800-$3,400 installed. Well-water systems with iron filtration, softener, and RO typically land $4,500-$9,500.
San Diego County Water Authority treats imported Colorado River and California Aqueduct water. Hard water and chloramine residual make point-of-use RO popular. Many San Diego installers run free in-home tests.
Frequently Asked Questions
- How hard is San Diego tap water?
- Moderately hard — typically 9-13 grains per gallon (155-220 ppm).
- What about chloramine?
- San Diego uses chloramine for secondary disinfection. Catalytic carbon block filters at point-of-use remove it.
- Is RO worth it?
- For most users, yes — under-sink RO reduces TDS and removes chloramine.
About NeedInstall
NeedInstall helps connect customers with local installation professionals across San Diego 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.