Aquasana
Aquasana OptimH2O RO (under-sink) Review (2026)
Certified PFAS / lead drinking-water fix
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Type
Point-of-use reverse osmosis
Flow rate
n/a
Warranty
Limited
Maintenance
Filter swaps
Price tier
$ (entry)
Best for
Certified PFAS / lead drinking-water fix
Key specifications
IAPMO-certified for PFOA/PFOS, lead and chromium-6.
Our take
The Aquasana OptimH2O RO (under-sink) is a strong fit for certified pfas / lead drinking-water fix. As with any whole-house treatment decision, the right choice depends on your incoming water (hardness, chlorine vs. chloramine, any flagged contaminants) and the size of your home. If you haven't already, check your local water-quality data before committing.
What problem does it solve?
Under-sink reverse osmosis system independently certified to NSF/ANSI 53, 58, P473 and 401, meaning verified removal of PFOA/PFOS, lead, chromium-6, pharmaceuticals and over 80 other contaminants. Delivers high-purity drinking water at one tap.
Who is this for?
Anyone whose EWG Tap Water report flags PFAS, lead, nitrate, arsenic or chromium, and who wants third-party certified removal at the kitchen sink for drinking and cooking water. Not a whole-house solution.
Pros
- NSF-certified for PFAS, lead, fluoride, chromium-6
- Claryum + RO + post filter stack
- Re-mineralizes for taste
- Under-sink size; no whole-house plumbing required
- Affordable upfront vs whole-house RO
Cons
- Only treats one faucet (kitchen)
- Wastes 1 to 3 gallons per gallon produced
- Storage tank takes cabinet space
- Filter swaps twice a year
Can I install this myself?
Easy DIY (1-2 hours)
Standard under-sink RO install. Mount the bracket and storage tank in the cabinet, tap the cold water line with the included saddle valve, run the drain line to the existing drain saddle, and mount the faucet in the sink hole or soap-dispenser hole. Most homeowners finish in 1 to 2 hours with no special tools.
What are the running costs I should foresee?
Filter cartridges every 6 months (about $80 to $100 per year). Membrane every 2 to 3 years (about $60). No electricity. Roughly 1 to 3 gallons of reject water per gallon produced.
Frequently asked questions
+Who is the OptimH2O for?
Households that have flagged PFAS, lead, fluoride, chromium-6 or nitrate on their water-quality report and want certified removal at the kitchen tap for drinking and cooking water.
+What does it remove?
NSF-certified against PFOA and PFOS, lead, fluoride, chlorine, chloramine, chromium-6 and 88 total contaminants. The post-filter remineralizes for taste so RO water does not feel flat.
+Can I install this myself?
Yes; this is one of the easier DIY plumbing jobs. Allow 1 to 2 hours. You need under-sink space for the storage tank and a hole in the counter for the dedicated faucet (or use the existing soap-dispenser hole).
+What are the running costs?
About $80 to $100 per year for the filter cartridges (changed every 6 months) and $60 every 2 to 3 years for the membrane. No electricity. RO does waste 1 to 3 gallons of reject water per gallon produced.
+Do I need this if I already have a whole-house filter?
Maybe. Whole-house carbon filters do not remove PFAS, fluoride or nitrate. If those are on your report, add an under-sink RO at the kitchen sink for drinking and cooking water.
Ready to look at current pricing?
We don't display prices on this site because the manufacturer changes them frequently.