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

Avatar for EJ Plumbing, LLC
EJ Plumbing, LLC
4.2(
11
)
Water Treatment & Purification System - Install or Replace

Serving San Francisco, CA and surrounding areas

Approved

In business since 2007

Emergency services offered

Warranties offered

Part of what makes EJ Home Services such a highly rated and memorable company is the compassionate personas that all of our friendly technicians have to offer. We treat every customer like a member of our own family because as a business that is run by a family, we understand the importance of kindness and respect for everyone that we work for.

427 neighbors recently requested a quote
Avatar for Edym Plumbing
Edym Plumbing
5.0(
2
)
Water Treatment & Purification System - Install or Replace

Serving San Francisco, CA and surrounding areas

Approved

In business since 2024

Free estimates

Credit card accepted

"Edy is the best plumber I have worked with! With my recent purchase of an older condo, I wanted to replace both toilets, supply lines and shut off valves in both baths, and kitchen. Edy was very professional, walked me through the work and offered fair pricing! Thanks again Edy!"
EDYM PLUMBING
EDYM PLUMBING
EDYM PLUMBING
EDYM PLUMBING
EDYM PLUMBING

+5

3 neighbors recently requested a quote
Avatar for AAA Water Systems
AAA Water Systems
4.7(
57
)
Water Treatment & Purification System - Install or Replace

Serving San Francisco, CA and surrounding areas

In business since 1993

Free estimates

Emergency services offered

"I feel so much better our family has cleaner drinking water! I have been considering getting a whole house water purification system and found Kinetico by AAA Water Systems. We had an appointment with Damian Fernandez. He was so nice and took the time to make sure we understood how the water system works and answered all of our questions. I was also horrified that the water test showed that what we had been drinking barely met regulations. The installation only took one day to complete. Jessie was courteous and confirmed my preferences before installing the system. The tanks take up much less space in our garage than I thought. Then Jessie walked through how to turn it off and on as well as how to maintain it. In the end I’m very pleased with the service and product! Here are a few things to consider… laundry pods have too much detergent and will stain your clothes. After the system is installed you’ll need much less detergent (money saver) for the washer and dishwasher. Also you’ll need to decide where you want your untreated water faucet to be. I chose inside the garage with the treatment system but I wish I would’ve chosen the outside faucet so I can water my plants with that water. Also if you’re like us with conserving water in this drought, keep in mind you can’t use the grey water from the house in your yard or garden. The treated water is not good for plants. Your house plants need to be watered with the hard, untreated water."
Whole Home Softener / Filter & Reverse Osmosis System
Whole Home Softener / Filter & Reverse Osmosis System
Compact Kinetico Drinking Water System. NSF 58 Certified to provide high quality drinking water!
Desktop style Kinetico Drinking Water System providing high quality water with NSF 58 certification.
Compact Kinetico Drinking Water System. NSF 58 Certified to provide high quality drinking water!

+18

Response time1 day
10 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for New Era Rooter & Plumbing
New Era Rooter & Plumbing
4.8(
34
)
Water Treatment & Purification System - Install or Replace

Serving San Francisco, CA and surrounding areas

Free estimates

Emergency services offered

"Finding a plumber who is there to solve the issue and not try to redo your whole bathroom is hard to find. Everyone wants to cut and replace but New Era Plumbing took the time to diagnose and fix what was needed. Efficient. Cost effective. Has the skills, knowledge, and confidence to do it in one morning. I feel like lots of plumbers wanted to hedge on what they could deliver, especially since they are turning off your water. I’m very grateful to finally find a skilled professional."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+3

Recommended by93%of homeowners
Avatar for Rayne Plumbing & Sewer Svc Inc
Rayne Plumbing & Sewer Svc Inc
4.4(
108
)
Water Treatment & Purification System - Install or Replace

Serving San Francisco, CA and surrounding areas

In business since 1964

Free estimates

Emergency services offered

"I purchased the special through Angie's list for the faucet replacement. Daisy, with Rayne, called me before I could call them to schedule the appointment! Super fast, and super friendly. I got an appointment for just a couple of days later! Super convenient! When I made my appointment, I mentioned that my daughter had a show for camp on that afternoon, and they would have to be there and finished by 2pm. On the day of the appointment, they called me first thing in the morning and came even earlier than promised! Super punctual! Aaron Campa, was very friendly, and completed the work very quickly. He even checked with me on the positioning of our multi-hose connector! He went above and beyond! All in all, I couldn't say enough positive things about Rayne, and my experience with them. I will now use them for all my plumbing needs!"
Custom Bathroom Sink
Sunnyvale Plumber
Value Repipe
Woodside Shower Valve
Recommended by84%of homeowners
Benjamin Franklin Plumbing Novato
3.9(
264
)
Water Treatment & Purification System - Install or Replace

Serving San Francisco, CA and surrounding areas

In business since 1996

Free estimates

Emergency services offered

"I thought it was really expensive because I got a 7 years contract.  They gave me a 50 gallon water heater because the specs were changing the following month for what’s required for water heaters so they gave me one that was bigger than I needed. It worked fine."
Recommended by73%of homeowners
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