Waterdrop · Countertop reverse osmosis
Waterdrop K19-H: what it removes and what it costs
The Waterdrop K19-H is certified (NSF/ANSI 58) to reduce TDS. Waterdrop also claims lead, chlorine, chloramine and fluoride from lab tests that are not certification. For 2 people drinking and cooking with it, replacement filters cost about $69 a year, and it sends about 68 gallons a year to the drain.
1
certified reductions we track
6.3¢
filters per gallon at rated life
Price checked 2026-10-23. We may earn a commission.
What the Waterdrop K19-H removes
"Certified" means a certifier (NSF, WQA, IAPMO or CSA) lists this exact product for that reduction claim; the listing is linked. "Brand test only" means Waterdrop cites a lab report but no certifier lists the claim. See certified vs. tested.
| Contaminant | Status | Evidence |
|---|---|---|
| TDS | Certified | IAPMO R&T listing, NSF/ANSI 58 ("TDS") |
| Lead | Brand test only | Unnamed third-party laboratory (per brand): "Lead" |
| Chlorine | Brand test only | Unnamed third-party laboratory (per brand): "Chlorine" |
| Chloramine | Brand test only | Unnamed third-party laboratory (per brand): "Chloramine" |
| Fluoride | Brand test only | Unnamed third-party laboratory (per brand): "Fluoride" |
| Arsenic | Brand test only | Unnamed third-party laboratory (per brand): "Arsenic" |
| Nitrate | Brand test only | Unnamed third-party laboratory (per brand): "Nitrate" |
| Chromium 6 | Brand test only | Unnamed third-party laboratory (per brand): "Chromium-VI" |
| Bacteria and viruses | Brand test only | Unnamed third-party laboratory (per brand): "Bacteria (99.9%)" |
| Copper | Brand test only | Unnamed third-party laboratory (per brand): "Copper" |
Not verified, either way (no certification or brand claim): PFAS, Mercury, Microplastics, Cysts, VOCs, Iron, Uranium, 1,4-dioxane.
What it costs to run
Yearly cost = replacements per year × filter price, for each filter it uses; a filter is replaced at its gallon rating or its month limit, whichever comes first, plus the water sent to the drain at an average water and sewer price. Water use: drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
| Household | Gallons a year | Filters a year | Drain water | Total a year | Per gallon |
|---|---|---|---|---|---|
| 1 person | 102 | $69 | 34 gal ($1) | $70 | 68¢ |
| 2 people | 204 | $69 | 68 gal ($1) | $70 | 34¢ |
| 4 people | 409 | $69 | 136 gal ($3) | $72 | 18¢ |
Per-gallon costs in the table are for real use, so they also count drain water and any filter replaced at its month limit before it reaches its gallon rating. At rated filter life alone, filters cost 6.3¢ a gallon (the figure at the top of this page).
Rated production is 75 gallons a day; 2 people need about 0.56 — well within it. Colder water and lower pressure reduce actual output.
Replacement filters
| Filter | Rated life (gallons) | Rated life (months) | Price |
|---|---|---|---|
| WD-K19RF (6-in-1 composite incl. RO) | 1,100 Source noteFilter page: up to 12 months or 1,100 gal; K19-S product page says 'Filters 528 gallons' (conflict) waterdropfilter.com | 12 Source note | $68.99 Source note |
Specs
- Type
- Countertop reverse osmosis
- Price
- $379
Source note
List $379.00; sale $279.00 on brand compare table 2026-10-23. Sibling K19-S marked 'Discontinued'; K19-SFK out of stock waterdropfilter.com
- Installation
- None
- Rated production
- 75 gallons per day
Source note
IAPMO listing: 288 LPD (~76 gpd) waterdropfilter.com
- Pure to drain
- 3:1
Source note
- Needs power
- Yes
- Remineralization
- No
Where it ranks
Compare the Waterdrop K19-H
Updates about the Waterdrop K19-H
- October 23, 2026 · New filters from Aug-Sep 2026: none yet confirmed in a certifier listing
Common questions
What does the Waterdrop K19-H remove?
The Waterdrop K19-H is certified (NSF/ANSI 58) to reduce TDS. Waterdrop also claims lead, chlorine, chloramine and fluoride from lab tests that are not certification. For 2 people drinking and cooking with it, replacement filters cost about $69 a year, and it sends about 68 gallons a year to the drain.
Does the Waterdrop K19-H remove PFAS?
It has no certifier listing or brand claim for PFAS reduction.
How much does the Waterdrop K19-H cost to run?
About $70 a year for 2 people ($70 for 1, $72 for 4), counting replacement filters and the water sent to the drain, for drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
Data checked 2026-10-23. 102 filters tracked.