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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 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."
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+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

"Excellent company excellent plumbers. Out water heater ruptured in the middle of the night and we had a plumber contacting us with next steps almost immediately at 2am. Greg, our plumber went above and beyond trying to get our hot water back as soon as possible and as cost effectively as possible and we can’t thank him enough for that. Great communication and a quick install. Can’t see us using anyone else for our 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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