Waterdrop G3P800

Checked against its certification listings: what they cover, what the maker claims, and what it costs over five years.

Under-sink reverse osmosis

Listings checked Oct. 9, 2026

Certified to

NSF/ANSI 42IAPMO listingchecked Oct. 9, 2026
NSF/ANSI 53IAPMO listingchecked Oct. 9, 2026
NSF/ANSI 58IAPMO listingchecked Oct. 9, 2026

Certified for: Lead, PFOA, PFOS, Fluoride, Chlorine

Water to drain: 3:1 pure to drain

Maker’s list price

$999

as of Oct. 9, 2026

Each replacement, at list price

CF composite filter (WD-G3-N1CF): $30
CB carbon block filter (WD-G3-N3CB): $30
RO filter (WD-G3P800-N2RO): $140

Five years, household of 3

$1,669

30¢ per gallon

TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Price on Amazon The maker’s page

List price from the maker’s site, checked Oct. 9, 2026. Prices change; the maker’s page is the final word.

What the listings say

Standard	Certifier	Claims	Listing
NSF/ANSI 42	IAPMO	Chlorine; Taste and Odor	Read the listing checked Oct. 9, 2026
NSF/ANSI 53	IAPMO	PFOA/PFOS	Read the listing checked Oct. 9, 2026
NSF/ANSI 58	IAPMO	TDS; Fluoride; Cadmium; Barium; Radium 226/228; Lead	Read the listing checked Oct. 9, 2026

Certified for, and claimed

Certified, by a listing

Claimed by the maker only

None recorded.

What it costs over five years

Household of 3, 3 gallons a day of drinking and cooking water. Installation not included.

Item	Replaced	Count	Amount
System, with first media	—	1	$999
CF composite filter (WD-G3-N1CF)	Every 6 monthsmonth rating	9	$270
CB carbon block filter (WD-G3-N3CB)	Every 12 monthsmonth rating	4	$120
RO filter (WD-G3P800-N2RO)	Every 2 yearsmonth rating	2	$280

Five-year total$1,669

Per gallon30¢

Run it for your household

Worth knowing

Tankless. The 58 claims are for the RO filter; the 42 and 53 claims are for the carbon block, which IAPMO lists as WD-G3-CB. The page showed $849 with a $150-off checkout offer; the $999 list price is recorded.

Other under-sink reverse osmosis filters

All filters