Homes & vacation rentals
Most of my RO jobs are kitchen sinks in homes, sometimes with a line run to the fridge. I keep it neat under the sink so you still have room for your stuff.
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Local Reverse Osmosis Water Filter Installation in Malibu CA
Better tasting water at the kitchen sink, set up right, with straight talk on what RO does and doesn't do.
Written by Sergio, owner of Malibu Plumbing Pros. Last updated October 2026.
Let me say this first: a lot of Malibu homes don't need an RO system. Some do. I'm Sergio, and I'll help you figure out which one you are before you spend a dime on reverse osmosis water filter installation in Malibu, CA.
RO stands for reverse osmosis. It pushes your water through a very fine screen, called a membrane, that lets water through and holds back most of what's dissolved in it. The clean water goes to a small faucet at your sink. The rest goes down the drain. I install the under-sink kind, the one most homes use for drinking and cooking water.
When Reverse Osmosis Water Filter Installation May Be the Right Next Step
Sound familiar? These are the calls we get most.
Tap water tastes off
Salty, flat or chlorine taste that makes you buy bottled water every week.
Spots on glasses and pots
White crust from hard water minerals that won't wash off your drinking glasses or kettle.
Worried about PFAS
You read about forever chemicals and want a filter certified to reduce them.
Tired of hauling bottles
Cases of water from the store, plastic everywhere, and running out at the worst time.
Old RO system acting up
Slow faucet, tank won't fill, drain line gurgles, or the filters haven't been changed in years.
Fridge water tastes bad
You want the ice maker and fridge dispenser on clean water too, not just the sink faucet.
Reverse Osmosis Water Filter Installation in Malibu, CA for Homes & Businesses
Shops, restaurants & property managers
Coffee shops, small restaurants and offices use RO for drinks and ice. I can size a system for your daily use and set it up so filters are easy to change.
Request Commercial QuoteOur Approach
Same four steps on every reverse osmosis water filter installation job.
- STEP 01
Look at your water first
Read your water report with you and test what comes out of the tap before we pick anything.
- STEP 02
Pick the right system
If a simple carbon filter does the job, I'll say so. If RO makes sense, I suggest a certified model.
- STEP 03
Install it neat
Cold water tap, drain connection, faucet hole, tank and filters, all tidy under the sink.
- STEP 04
Flush and teach you
Flush the new filters, check every fitting for drips, and show you how to change them.
On this page
Fixing RO Systems Someone Else Put In
I get called to a lot of RO setups that were installed fast and forgotten. Drain lines with no loop that let sink water back up into the system. Push-in fittings that drip on the cabinet floor for months. A storage tank with no air in it, so the faucet barely trickles. Filters that haven't been changed since the house was sold.
Before any new reverse osmosis water filter installation in Malibu, CA, I'll figure out if your current system is worth saving. A lot of times it is. New filters, a new membrane, the right drain fitting and some air in the tank, and it works like new. If the unit is cheap and worn out, I'll tell you a new one will cost you less in the long run.
Do You Even Need RO in Malibu?
Start with the facts. Most of Malibu gets water from LA County Waterworks District 29. Its 2024 water quality report says the water met or beat all health-based drinking water standards. In the same report, lead testing at homes found 0 of 38 sites over the action level.
So why do people want RO? Taste, mostly. The water comes from the Colorado River and the State Water Project through the Metropolitan Water District. One treatment plant shows average total dissolved solids (minerals and salts in the water) of 632 parts per million and sodium of 105. It's also disinfected with chlorine, which some folks can taste. RO cuts all of that way down.
You probably don't need RO if your only gripe is chlorine taste. A good carbon filter on the faucet fixes that for less money. And if your problem is scale in your water heater and shower, RO won't help. That's a whole-house job for a water softener.
What Reverse Osmosis Water Filter Installation in Malibu, CA Removes
Two things to know. First, RO is very good at pulling out dissolved stuff: salts, sodium, hardness minerals and more. The EPA found that point-of-use RO systems can greatly reduce PFAS, the forever chemicals people worry about.
Second, not every system is equal. The EPA says to look for certification to NSF/ANSI 58, the standard for reverse osmosis units, and to check that PFAS reduction is on the label. When I do a reverse osmosis water filter installation in Malibu, CA, I show you the certification for the model before we buy it, so you know exactly what it's tested to remove.
Waste Water and Septic: The Part Nobody Mentions
RO sends some water down the drain to rinse the membrane. The EPA WaterSense page says a typical under-sink system sends five gallons or more down the drain for every gallon of clean water, and some send up to 10. Systems with the WaterSense label send 2.3 gallons or less. EPA says picking a labeled model saves more than 3,100 gallons a year on average.
That matters more here than most places. Many Malibu homes are on septic, and the city's rebuild guide lists a septic permit for a typical single-family home. Every extra gallon down the drain goes into that system. So for reverse osmosis water filter installation in Malibu, CA, I steer you to an efficient model. Ok, that's my speech.
Filter Changes, Install Time and Cost
An under-sink install usually takes two to three hours. I connect to the cold water line, add a drain fitting, drill the faucet hole if you need one, set the tank and filters, then flush the system.
Keep up with filters, or the system stops doing its job. Changing them yourself? It don't take long once I show you. EPA says filters only work if you change them on the maker's schedule. This Old House says pre-filters usually need changing every six months to two years and the membrane every three to five years.
For cost, This Old House lists point-of-use RO at $150 to $1,300 for the system and install, with the install alone often $150 to $300. That's a national range. I give you my upfront price before any work starts.
What to Expect
Time: two to three hours for a typical under-sink install. A fridge line adds a bit.
Mess: I clear the cabinet with you, lay a towel down, drill clean, and leave the space neat with room to reach the filters.
Permits: an under-sink RO system on an existing sink usually doesn't need a permit. If we add a new drain or move plumbing in the wall, I'll check with City of Malibu Building Safety first.
Cost: national range for point-of-use RO is $150 to $1,300 per This Old House. Your reverse osmosis water filter installation in Malibu, CA comes with an upfront price before I start.
Last updated October 2026.
Reverse Osmosis Water Filter Installation in Malibu, CA FAQ
Straight answers to what people ask on the phone.
All plumbing FAQsIs Malibu tap water safe to drink without a filter?
By the numbers, yes. District 29's 2024 water quality report says the water met or beat all health-based drinking water standards. Most people who add RO do it for taste, for less sodium and minerals, or for extra protection from things like PFAS. If you're happy with your water, you don't need one.
How much water does an RO system waste?
EPA WaterSense says a typical under-sink RO unit sends five gallons or more down the drain for every gallon it makes. WaterSense labeled models send 2.3 gallons or less. If your home is on septic, that difference adds up fast, so I usually suggest a labeled, efficient model.
How often do RO filters need to be changed?
This Old House says pre-filters usually last six months to two years and the membrane three to five years. Your model's manual has the exact schedule, and EPA notes filters only work when you follow it. I can set you up with the right filters and show you how to swap them.
Does reverse osmosis remove PFAS?
The EPA found that point-of-use RO systems can greatly reduce PFAS. Not every unit is tested for it, though. Look for certification to NSF/ANSI 58 with PFAS reduction listed. I'll show you that on the box or the listing before we pick a model, so there's no guessing.
Will an RO system fix hard water in my whole house?
No. An under-sink RO system only treats water at one faucet, and maybe your fridge. Scale in your showers, water heater and appliances is a whole-house problem. For that you want a water softener or scale filter at the main line. I can help with either one.