Where treatment belongs
Whole-house vs. under-sink for PFAS & lead — by exposure route.
Read → Honest water-filter guidance
The right water filter for your home — in 60 seconds.
Answer a few questions and get the correct system, the right size, and the honest call on whether you even need whole-house. Free, no email.
100%Free — no email, no paywall
NSF·IAPMOVerified picks only
HonestWe say when cheaper's right
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The selector
Build your recommendation
Tell us your source and what's in your water. No test yet? Start with one — the link's in the form and up top.
Learn the basics → ≈ ○ ▢ ✓
Know before you buy.
Softener or filter?
They solve different problems. Here's which one you actually need.
Read →PFAS in well water
Serious — but under-sink is usually the right, certified fix.
Read →Sizing by bathrooms
What size whole-house filter for a 3, 4, or 5-bathroom home.
Read →Test your water first
City vs. well — what to test for, and why your senses can't tell.
Read → Common questions
Before you start.
Is this really free?
Yes — 100% free, no email. We may earn a commission from retailer links, but it never changes the recommendation. When a cheaper point-of-use filter is right, the tool says so and stops.
Do I need whole-house for PFAS or lead?
Usually not. Those harm you when you drink them, so a certified under-sink filter at the tap is the correct, cheaper fix. There's no whole-house system certified to remove lead.
What does “certified” mean here?
We show “certified to reduce” a contaminant only when a product has a verified finished-product listing in the NSF, IAPMO, or WQA database. Otherwise we describe it factually.
Should I test my water first?
Yes. PFAS, lead, nitrate and arsenic are odorless, colorless and tasteless — a lab test is the only way to know what to treat.
Know exactly what your water needs.
The right system, the right size, and the honest answer — in about a minute.
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