Only three systems here carry a certified PFOA/PFOS claim we could trace to a certifier listing — Aquasana AQ-5300+, AquaTru Classic and Waterdrop G3P800 — with 5-year totals from around $1,024 to around $1,669. iSpring, Hydroviv and Clearly Filtered are excluded, with the exact gap in each claim shown.
The certification trap is the story: Samsung HAF-CIN and HAF-QIN are both NSF-listed for 42, 53 and 401, LG LT1000P carries the same three standards on its NSF-named data sheet, and everydrop Filter 4 is certified 42/53/401 — but GE’s RPWFE sheet on file certifies only 42 and 53 and expressly disclaims NSF certification for its pharmaceutical claims. Standard compatibles (Waterdrop, AQUA CREST) verify as 42 and 372 only — taste, not lead — while Waterdrop Plus lines carry named NSF/IAPMO certification for 42, 53 and 401. Annual cost at two six-month cartridges: about $70–$120 OEM, about $20 taste-only compatible, about $28 certified Plus-type.
The sticker is the smallest number. Equipment, installation, every filter and media change added up for three representative setups — about $1,380 to $1,999 over five years, with the arithmetic shown.
Only one under-sink filter here has an end-to-end verified PFOA/PFOS certification. We checked every claim against certifier listings and ran the 5-year filter math — from around $198 to around $2,188.
Five whole-house systems compared on what we could actually verify: certifications, flow rates, and true five-year costs — including the certification gaps most roundups skip.
NSF/ANSI 177 certifies free chlorine reduction only — not chloramine, lead, or softening. Certified Sprite and Culligan picks, honest Aquasana and Jolie distinctions, and five-year costs.
