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Water Treatment Answers is a free service that connects homeowners with local water treatment and filtration companies. We are not a water-treatment company or installer, and we do not perform the work ourselves.

The short answer

Costs depend on the system. A whole-house filter usually runs about $1,000 to $3,300 installed, a water softener about $1,000 to $3,000, and an under-sink reverse-osmosis unit about $300 to $950. Whole-house reverse osmosis is the priciest, roughly $4,800 to $8,000. Your water test and home plumbing set the final figure.

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Typical installed cost by system type (U.S.)
SystemTypical installed cost
Whole-house filter (sediment + carbon)$1,000–$3,300
Water softener (salt-based)$1,000–$3,000
Salt-free water conditioner$1,500–$4,500
Under-sink reverse osmosis$300–$950
Whole-house reverse osmosis$4,800–$8,000
Common Questions

What Water Treatment Costs: questions people ask

Is Water Treatment Answers a water treatment company?

No. We're a free matching service. We are not a water-treatment company, installer, or manufacturer, we connect you with vetted local companies who do that work.

What does it cost to use?

Nothing. Our service is free for homeowners. The companies in our network pay us when we refer you, so you're never charged for the connection.

Do I really need to test my water first?

It's the best first step. A water test, from a certified lab, your utility's annual report, or your county health department, tells you what to treat so you don't overpay for a system you don't need.

What kinds of water problems can you help with?

Hard water, chlorine taste and odor, iron and sulfur, sediment, bacteria in well water, and contaminants like lead or PFAS. We match you with companies that handle your specific issue.

Are the companies licensed and certified?

We match you with companies that carry the licensing their state requires and install NSF-certified equipment. Always confirm the details and the warranty before you hire.

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Sources

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