Refrigerator Water Filters Ranked by Cost per Certified Gallon
Last reviewed July 2026.
Every refrigerator water filter we track that holds an accredited certification, ranked on cost per gallon of certified filtration — the filter's price divided by the capacity its certification actually covers. Sticker price tells you almost nothing: the cheapest filter here is Waterdrop WDS-F27 at $0.030/gallon, and the most expensive, everydrop (Whirlpool) EDR1RXD1, costs 10.0× more for every gallon it filters.
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| # | Filter | $ / certified gal | Capacity | Lead | PFOA/PFOS | Certifier |
|---|---|---|---|---|---|---|
| 1 | Waterdrop WDS-F27 — Samsung DA29-00020B replacement (4-pack) WDS-F27 brand ↗ | $0.030 | 300 gal | ✓ | ✗ | NSF |
| 2 | Waterdrop Plus WDP — Samsung DA29-00020B replacement (3-pack) WDP-F27 buy ↗ | $0.044 | 300 gal | ✓ | ✗ | NSF |
| 3 | Waterdrop Plus WDP-UKF8001 — everydrop Filter 4 / EDR4RXD1 replacement WDP-UKF8001 buy ↗ | $0.117 | 300 gal | ✓ | ✗ | NSF |
| 4 | everydrop (Whirlpool) Refrigerator Water Filter 1 EDR1RXD1 buy ↗ | $0.300 | 200 gal | ✓ | ✗ | NSF |
Price per filter ÷ certified capacity in gallons. Prices carry the date they were checked in the dataset and drift; the retailer page is authoritative.
Certified, but not yet rankable
- everydrop (Whirlpool) EDR2RXD1 — price pending.
- Samsung DA29-00020B — price pending.
- Waterdrop WD-F38 — no rated capacity published.
Read the standards before the price
A cheap cost per gallon means nothing if the certification doesn't cover the contaminant you're worried about. NSF/ANSI 42 is chlorine, taste and odour — not a health claim. Lead and PFOA/PFOS are individual claims, certified under 53 where they exist, and a 53 listing covers only the contaminants its claim set names. 401 covers pharmaceuticals and other emerging compounds; no 401 claim set we read includes PFOA or PFOS. The Lead and PFOA/PFOS columns above follow each model's sourced claim, not its standard numbers — check the ✓ before the dollar figure, and see 42 vs 53 vs 401.
Where each ✓ comes from
Waterdrop WDS-F27: lead — NSF, NSF/ANSI 53, read 2026-10-02.
Waterdrop WDP-F27: lead — NSF, NSF/ANSI 53, read 2026-10-02.
Waterdrop WDP-UKF8001: lead — NSF, NSF/ANSI 53, read 2026-10-02.
everydrop (Whirlpool) EDR1RXD1: lead — NSF, NSF/ANSI 53, read 2026-10-02.
everydrop (Whirlpool) EDR2RXD1: lead — NSF, NSF/ANSI 53, read 2026-10-02.
Samsung DA29-00020B: lead — NSF, NSF/ANSI 53, read 2026-10-02.
We do not test filters — we index what accredited certifiers publish, with attribution, and make no health or treatment claims. A certification covers a specific model against a specific standard; it is not a general seal of quality. We are not affiliated with NSF International.
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