How Much Do Reverse Osmosis Water Filtration Systems Cost?

By Melanie Dawn

September 17, 2026

It feels like every time you turn on the news, there’s another warning about local water quality. Between aging municipal water pipes and heavy storm runoff that affects well water, access to clean drinking water is a major concern that affects homeowners everywhere. Fortunately, a reverse osmosis system for the home is one way to address these issues.

This May Also Interest You: Why Does My Tap Water Taste Salty?

Before you invite your local plumber to install an RO system, you need to understand what a reverse osmosis system is and the costs involved. This will give you a good idea of how much it will affect your budget. The following article describes everything you need to know about reverse osmosis (RO) systems.

What Is a Reverse Osmosis System and How Does It Work?

First, to understand what you’re paying for, it helps to know how a RO system works. Normal water filters use carbon to absorb contaminants and odors. RO systems use your home’s natural water pressure. When water flows through the system, it passes through a pre-filter to catch things like rust, sediment and chlorine. Afterward, the filtered water moves through a semi-permeable membrane that removes odors and bad tastes.

What Does a Reverse Osmosis System Remove?

The two stages of filtration remove everything from lead and fluoride to forever chemicals (PFAS). You’re left with crystal-clear, bottled-quality water.

Where Are Reverse Osmosis Filters Installed?

Under-Sink Systems

You have two choices when installing RO systems. Most homeowners choose a point-of-use (POU) sink system. These compact units fit beneath your sink and only filter water that passes through your sink faucet. POU systems can filter 50 to 75 gallons of water per day. This is typically more than enough for drinking and cooking.

Whole-House Systems

The other option is a whole-house setup. Much larger than POU systems, whole-house filters are installed near your water heater or where your main water line enters your home. They treat all water flowing to faucets and appliances throughout the home. Most homeowners use these systems if they have problems with contaminated well water, as they require large storage tanks that take up space.

How Much Does a Reverse Osmosis System Cost?

The cost of a RO system varies depending on what type of system you’re looking at. A POU or under-sink RO system costs between $300 and $950 (CAD 417 to CAD 1,319). Whole-house systems cost between $4,800 and $8,000 (CAD 6,666 to CAD 11,110). These estimates include the cost of labor.

More Related Articles:

What Factors Influence Cost?

The final price tag for a RO system depends on several factors. Before purchasing a system, always test your water to see what contaminants are hiding in your pipes. This will tell you the best filtration system to buy. A basic three-stage RO costs significantly less than a premium six-stage system that includes a remineralization feature to add calcium and magnesium back into your water to improve the taste.

Another major factor is the system’s efficiency. RO systems constantly flush filtered contaminants down the drain. Inexpensive models waste as much as four gallons of water each time during this cleaning process. High-efficiency systems or WaterSense-certified systems cost more up front because they have specialized pumps that reduce wastewater. Over time, money saved on water bills can pay for the unit.

Under-sink osmosis systems vary in cost depending on how much water is filtered per day. In smaller homes or homes with fewer residents, a small unit that generates 50 to 400 gallons of water per day is sufficient. These units cost between $300 and $700 (CAD 417 to CAD 972) installed. Larger units that handle 400 to 1,200 gallons of water per day cost between $450 and $950 (CAD 625 to CAD 1,319) installed.

One similar alternative to RO systems is high-capacity multi-stage carbon and sediment filters. While they aren’t as effective as RO systems, they are much cheaper and offer zero water waste.

How Much Does Installation Cost?

Installation costs vary depending on the type of RO system. For a basic under-sink setup, most DIYers can install the system without contacting a professional. Under-sink RO systems include a kit with color-coded tubing and simple instructions. If you prefer to hire a professional plumber, expect to pay between $125 and $350 (CAD 173 to CAD 486) in labor costs. These costs may vary slightly depending on labor costs in your area.

Installing a whole-house system is a major construction project that involves plumbing modifications, rerouting main water lines, and setting up electrical pumps. A licensed plumber typically charges between $500 and $800 (CAD 694 to CAD 1,111) for larger plumbing jobs. You should also expect to pay between $45 and $150 (CAD 62 to CAD 208) per hour, plus a minimum service call fee between $50 and $200 (CAD 69 to CAD 278).

Follow us