How Much Does a Reverse Osmosis System Cost? [2025 Data]

Reverse Osmosis Water Filter System Cost Factors

The price of your reverse osmosis (RO) water filter depends on several factors, including the type of water filter and the efficiency of the system. Let’s break down these variables to give you a better idea of how much you’ll pay for your system.

Type of System

There are two main types of RO systems: whole-house and point-of-use. Whole-house RO water filter systems (also known as point-of-entry systems) are installed at your home’s main line, where they treat all of the water coming into your house. While these are great at filtering all water that enters your home, they can be overkill for some who only need RO-filtered water at certain faucets. 

On the other hand, point-of-use systems treat water at a single water fixture (for example, a kitchen sink or refrigerator). These are excellent choices if you primarily drink from one water fixture, don’t want to swap filters regularly, or want to avoid investing in a large, whole-house RO system.

As you might expect, whole-house systems cost more than point-of-use filters. Here’s what you can expect to pay for each type: 

System Efficiency

The purpose of reverse osmosis water filter systems is to produce clean, drinkable water, but they also generate significant amounts of wastewater in the process.

According to the Environmental Protection Agency (EPA), a point-of-use RO system wastes 5 gallons of water per gallon of treated water. Some newer systems are more efficient, reaching a one-to-one ratio of wastewater to filtered water, but they cost about $300 more than less efficient products.

Filtration Stages

Reverse osmosis systems have multiple filtration stages (often between three and seven), each of which serves a different function. For example, the first level might remove sediment particles, while the second one extracts carbon from the water. 

As you compare RO systems from the same company, you’ll notice that products with more filtration stages are often pricier than ones with fewer stages. However, this isn’t always true because a four-stage RO water filter from one company could cost less than a seven-stage filter from another. 

Keep in mind costs will differ between point-of-use and whole-house systems, too. Explore average starting prices for point-of-use reverse osmosis filters based on the number of filtration stages:

System Capacity

Different filters have different flow capacities. Which one you choose will depend on the water usage in your home, which can be estimated based on the number of people living in the home. If you don’t have any exceptional water needs, the average person uses around 175 gallons per day. Not all of this is water that’s required to be filtered, though (for example, you don’t need to filter toilet water). 

Expect to pay more for larger units with more filtration capacity. However, the cost may remain the same over the filter's lifetime. Larger units cost more, but if the system wears less, you’ll save on filter replacements. Talk to a pro to determine the right size of system your household needs.  

Labor

On average, it costs between $300 and $700 to hire a professional to install a reverse osmosis water filter system. Your price will depend on a few factors, including labor rates in your area and the size and complexity of your RO system. For example, you might only pay $100 to $300 to install a point-of-use system, while a whole-house system could cost closer to $1,500.

Reverse Osmosis Water Filter Ongoing Costs

In addition to the upfront costs of installing a reverse osmosis water filter, there are ongoing expenses to consider. Here’s what to expect.

Filter Replacement

Filters need to be replaced at least every year, but it’s a good habit to swap them once every six months. The good news is they aren’t complicated to replace and are relatively inexpensive. A set of RO filters will cost between $40 and $90, but it can be quite a bit more if you have a large system or one with special filters. In that case, budget between $100 and $300 per year for replacement filters.  

Membrane Replacement

The RO membrane is separate from the filters but is an integral part of the system. On most systems, the membrane will look similar to a filter but will be installed horizontally on top of the filters. You should replace the membrane every two to five years, which will add $30 to $100 to these costs.

System Maintenance

For the most part, your RO water filter system should run pretty seamlessly. However, to keep it in good shape, you’ll need to perform periodic maintenance, like checking for leaks and cleaning and sanitizing the system annually. You can do this for free by following the instructions in your user manual. 

Otherwise, you can call in a plumber or water filtration professional (which you might need to do anyway if you find any leaks or other issues while inspecting your system). On average, hiring a plumber costs between $45 and $200 per hour.

DIY Reverse Osmosis Water Filter Installation vs. Hiring a Pro

If you plan on adding a point-of-use reverse osmosis water filter system to your home, you can cut costs by installing it yourself. To do so, you’ll need a few common tools (like a wrench and screwdriver) and basic plumbing experience. By going the DIY route, you can save around $150 to $300 in labor.

However, you’ll want to bring in a local water softener installation company or plumber if you’re installing a whole-house RO system. Setting up one of these systems involves more complex plumbing work, including turning off your home’s water supply and connecting the system to the main water line. Plus, if you hire a reputable pro, you should get a guarantee or warranty on their work.

Cost of Common Reverse Osmosis Water Filter Add-Ons

If you’re installing a new point-of-use RO system in your kitchen, you might want to tackle other kitchen plumbing projects at the same time. 

• Cost to install a new dishwasher: $200–$3,500

• Cost to replace a garbage disposal: $200–$625

• Cost to add a refrigerator water line: $75–$130

• Cost to install a sink: $200–$650

• Cost to add a hot water dispenser: $300–$600

• Cost to add UV filtration: $200–$500

• Cost to add booster pump: $50–$300

• Cost to add alkaline remineralization kit: $150–$300

How to Save Money on a Reverse Osmosis Water Filter

As we’ve mentioned, installing your own small point-of-use RO system is one way to reduce costs. Other money-saving options include:

• Buying a refurbished system: You’ll spend less upfront if you buy a refurbished reverse osmosis water system instead of a new one. However, you’ll want to confirm that the system is still in good condition and covered by a warranty before making a purchase.

• Opting for an energy-efficient model: To keep operational costs down and reduce water usage, invest in an energy-efficient RO system.

• Comparing brands and prices: There are many RO systems for sale online from home improvement stores and online retailers. Take the time to research different brands and products to find the right model for your needs—and get the best deal on it.

• Requesting multiple quotes: Installation prices vary by company. Gathering several estimates will let you compare rates and find the most competitive offer.