How much does a whole-house water filter cost?
A whole-home carbon filter with a tankless reverse osmosis drinking water system costs $2,895 installed by Willow Springs, or about $61 a month with approved financing. If your water is also hard, packages with a softener are $3,295 and $4,495. Here's what each includes and which homes each one fits.
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Whole-home filtration packages
Every price includes equipment, installation by a licensed plumber, fittings, a bypass valve and startup.
or about $61/mo*
Whole-home carbon filter + 7-stage tankless reverse osmosis
Chlorine taste and smell at every tap, plus purified drinking water. No softening.
or about $70/mo*
Carbon + softener combination tank + 7-stage tankless reverse osmosis
Best value for hard city water: softening and chlorine removal in one tank.
or about $95/mo*
Separate whole-home carbon filter + water softener + 7-stage tankless reverse osmosis
Best for chloramine, PFAS and disinfection byproducts: a dedicated carbon tank gives more contact time.
*60 months at 9.99% APR, subject to credit approval. Prices installed, as of October 2026.
What each part does
| Equipment | What it does | In |
|---|---|---|
| Whole-home catalytic carbon filter | Reduces chlorine, chloramine, disinfection byproducts and many chemicals including PFAS, at every tap and shower | City Clean, City Premium |
| Carbon + softener combination tank | One tank that removes chlorine with a carbon layer and hardness with softening resin | City Essential |
| Water softener | Removes the calcium and magnesium that cause scale and spots | City Premium |
| 7-stage tankless reverse osmosis | Kitchen drinking water: removes nitrate, lead, arsenic, PFAS, sodium and dissolved solids | Every package |
Which package fits?
Soft city water: City Clean.
Hard city water, chlorine: City Essential.
Hard water with chloramine, or PFAS or byproducts in your report: City Premium.
Not sure? Our free test and your utility's report decide it.
Local water notes
Chloramine: Western Berks Water Authority (Wyomissing, West Reading, Shillington) disinfects with chloramine, which needs catalytic carbon. Wyomissing water →
PFAS and byproducts: City of Lancaster reported PFOA up to 22.3 ppt and trihalomethanes at 75.2 ppb (limit 80) in 2025. Lancaster water →
Very hard water: Pennsylvania American Water's Penn District averaged 204 to 360 mg/L. Sinking Spring water →
Whole-house water filter cost: common questions
How much does a whole-house water filter cost?
A whole-home carbon filter with a 7-stage tankless reverse osmosis drinking water system installed by Willow Springs is $2,895, or about $61 a month with approved financing. Adding softening brings it to $3,295 with a combination tank or $4,495 with separate tanks.
What does a whole-house carbon filter remove?
A catalytic carbon tank on your main line reduces chlorine, chloramine, disinfection byproducts and many chemicals, including PFAS, at every faucet and shower.
Why is reverse osmosis included?
Carbon handles taste and chemicals, while reverse osmosis at the kitchen sink also removes nitrate, lead, arsenic, sodium and dissolved solids from the water you drink and cook with. Every city package includes it.
Do I need a softener too?
Only if your water is hard. If it is, City Essential or City Premium handles both. Our free water test tells you your hardness.
Is there financing?
Yes, with approved credit: 60 months at 9.99% APR. City Clean is about $61 a month.
Written by Sam Beiler, co-founder of Willow Springs Water Company, Sinking Spring, PA. Last updated October 2026.