How Much Does an Under Sink Reverse Osmosis System Cost to Install?

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Under sink reverse osmosis systems are easier to install and are more affordable than whole house systems.

If you’re wondering how much it’ll cost to install an RO system under your kitchen sink, this article is for you.

We’ll analyze the expenses of installing an under sink reverse osmosis system and discuss how much it’ll cost you to maintain it.

Key Takeaways

  • Installation of an under sink reverse osmosis system costs between $150 to $400.
  • You may need additional tools and supplies which could add another $50-100.

Under Sink Reverse Osmosis System Installation Cost

So, how much does it cost to install an under sink reverse osmosis system?

Well, there are two things to plan for; the labor cost and the cost of tools and supplies needed for installation.

Labor Fees

Hiring a professional to install an under sink RO filter will cost you between $150 and $400.

However, if you have basic plumbing skills and the necessary tools, you can install a system yourself and save the labor fees.

Installation Supplies + Tools

Supplies you’ll need to install an under sink reverse osmosis system may include connectors, fittings, and adapters. These tools could add another $50 to $100 in total. Generally, though, all supplies should be included with the system.

As far as tools are concerned, all you really need is a drill and some Teflon tape.

Factors That Affect Installation Cost

The price we mentioned above has a wide range. That’s because a couple of factors influence the exact amount you’ll eventually spend installing an under sink RO filter. We’ve analyzed each of these factors below.

Installation Location

If you have appliances like a garbage disposal under your kitchen sink, installing an RO system can become more difficult.

The plumber would have to fix the system in a limited space without damaging existing appliances.

They’ll charge you extra for any troubles, meaning you’ll spend more on labor fees.

Additional Plumbing Work Required

Installing under sink RO systems usually does not require additional plumbing work. But if your plumbing is peculiar and needs customization, you’ll spend more on installation.

A standard RO system comes with a storage tank and an additional dispenser to be installed on the countertop. That means you’ll need to do some drilling on the kitchen cabinet (which raises your installation costs).

plumber installing reverse osmosis system under sink

The Complexity of the Under Sink RO System

The exact model of under sink system you buy could also affect installation cost.

For example, if you buy one with complicated designs and lots of parts to join and fix, you’ll pay more.

DIY Installation vs. Hiring a Professional

As we mentioned, you can install almost any under sink RO system if you’re familiar with the (basic) plumbing process. Also, if you’re simply replacing an existing unit — not installing a filter under your sink for the first time — you can DIY. It will be easier since the necessary connections are ready-made.

However, if you have zero plumbing know-how and you’re installing your first RO water filtration system, it might best to hire a plumber. Remember, you might need to drill your countertop to fix the extra dispenser. So, to be on the safe end, you should hire a professional.

Under Sink RO Water Filter System Prices

You’ll find this part helpful if you’re yet to buy an under sink RO filter. We’ve curated the latest prices systems to help you prepare the most realistic budget.

Under Sink RO System Price Tag
Waterdrop G3 Under Sink RO System (Tankless) $499.00
Aquasana OptimH2O Under Sink RO System $349.99
Crystal Quest Thunder Under Sink RO Water Filter $298.40
NU Aqua Platinum Series 5-Stage Reverse Osmosis System $179.35
Home Master TMHP RO Filter System $529.95
APEC Ultimate RO-90 Reverse Osmosis Drinking Water Filter $299.95
Brondell Circle $375.00
Express Water RO5DX $148.18
iSpring RCC7AK Reverse Osmosis System with Remineralization $216.73
Olympia Water Systems OROS-50 $169.99
Whirlpool WHER25 Under Sink RO System $169.00

*Last updated: January 2023.

How Much Does It Cost to Maintain an Under Sink Reverse Osmosis System?

Maintenance costs are a significant part of the total expenses of any reverse osmosis filter system.

  • You must change the pre-filter cartridges every 6 to 12 months, depending on how much water you use and the number of contaminants in your water.
  • There’s also the reverse osmosis membrane, which you must replace every 2 to 5 years.
  • Post-filters usually last 12-24 months.

At the end of each year, you’ll spend between $60 to $200 on maintaining your under sink RO system.

A trick to saving some maintenance costs is buying aftermarket components, which are usually cheaper. But if you’re going for aftermarket parts, you must carefully confirm that their quality is okay because they are sometimes below grade.

Total Average Cost (First Year)

Average Under Sink RO Price Tag Installation Cost Yearly Maintenance Cost Total Average Cost (First Year)
$150-600 $0-500 $60-200 $210-1300

If you have any questions about the cost to install a reverse osmosis system under the sink please don’t hesitate to leave a comment below!

About the Author Alexandra Uta

Alex is a content writer with an affinity for research and a methodical attention to detail. Since 2020, she has fully immersed herself into the home water treatment industry only to become an expert herself. Alex has been using water filters and similar products for years which has gained her lots of hands-on experience.
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