If you ask a plumber or a home improvement store clerk, they’ll hit you with the dreaded “it depends.” And yeah, it’s annoyingly accurate. A basic whole-house system might run you anywhere from $400 to $1,500 for the unit itself—but that’s like saying a car costs between $5,000 and $100,000. Big difference, right?
Here’s the kicker: installation can double or triple that cost. Unless you’re a DIY wizard with a wrench and a lot of patience, expect to pay a plumber $200 to $800 for the hookup. (Pro tip: don’t try to install a reverse osmosis system yourself unless you enjoy waking up to a flooded basement.)
The “Cheap” Filter That Costs You More
Let’s talk about those cute little pitcher filters or faucet-mounted units. They’re cheap—like $20 to $50—but they’re not really house systems. They’re more like a band-aid for a bullet wound. A real whole-house filtration system treats every tap: your shower, your washing machine, even the hose outside.
So, what’s the price range for a solid system? A basic sediment and carbon filter combo (good for city water with chlorine) can start at $600 to $1,200 installed. If you’re on well water with iron, sulfur, or bacteria—welcome to the big leagues—you’re looking at $1,500 to $4,000 for a decent setup. Yeah, I saw your jaw drop.
