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· 20 in stock · prices checked Oct 17, 2026, 6:34 AM ET
Cheapest water filter per gallon right now
Price ÷ the gallons the brand says the filter is rated for, with the brand's wording on each product page. The full table, grouped by filter type, is in the Water Index.
The ranking lowest cost per rated gallon first
Brand-store buttons go straight to the brand's own page, with no affiliate tag. Rankings are pure math.
| Rank | Product | $ / rated gallon | Rated (brand) | Price today | vs. last week |
|---|---|---|---|---|---|
| #1 | Survivor Filter Straw Ultra Filter Replacement Survivor Filter In stock | $0.0006 | 26,417 gal | $16.95 | history building |
| #2 | SURVIVOR FILTER™ Pure 10K - Replacement Chlorine Filter Survivor Filter In stock | $0.0080 | 10,000 gal | $80.00 | history building |
| #3 | Puribag Micro - Mini membrane water filter Uncharted Supply Co In stock | $0.0174 | 1,321 gal | $22.99 | history building |
| #4 | Puribag Pro - Membrane Filter Kit Uncharted Supply Co In stock | $0.0227 | 1,321 gal | $29.99 | history building |
| #5 | LifeStraw Peak Series Straw Echo-Sigma In stock | $0.0260 | 1,000 gal | $25.99 | history building |
| #6 | SURVIVOR FILTER™ Max, 2-Stage Fluoride and Chlorine In-Line Home Filter Survivor Filter In stock | $0.0400 | 5,000 gal | $200.00 | history building |
| #7 | Puribag Pro Portable Water Purification System Uncharted Supply Co In stock | $0.0492 | 1,321 gal | $64.99 | history building |
| #8 | Survivor Filter Straw Carbon Filter Replacement Survivor Filter In stock | $0.0566 | 264 gal | $14.95 | history building |
| #9 | SURVIVOR FILTER™ Max - Replacement Stage 1 Fluoride Filter Survivor Filter In stock | $0.0588 | 1,700 gal | $100.00 | history building |
| #10 | Big Berkey Stainless Steel Drip Filter System - 2 Black Berkey Filters (approx. 6000 gal.) Legacy Food Storage In stock | $0.0645 | 6,000 gal | $387.00 | history building |
| #11 | Royal Berkey Stainless Steel Drip Filter System - Includes 2 Black Berkey® Filters (approx. 6000 gal.) Legacy Food Storage In stock | $0.0717 | 6,000 gal | $430.00 | history building |
| #12 | Puribag Pro Kit - Portable 4-in-1 Water Filtration System Uncharted Supply Co In stock | $0.0757 | 1,321 gal | $99.99 | history building |
| #13 | LifeStraw SIP Echo-Sigma In stock | $0.13 | 264 gal | $34.95 | history building |
| #14 | SURVIVOR FILTER PRO™ Portable Water Filter Pump Survivor Filter In stock | $0.15 | 528 gal | $77.95 | history building |
| #15 | Replacement Filter for Active All Terrain and Americana Ultra Light Water Bottle, 2-Pack Survivor Filter In stock | $0.35 | 100 gal | $35.00 | history building |
| #16 | Frontier Max Filter System Virus - Red line (RED-IV-120) Legacy Food Storage In stock | $0.42 | 120 gal | $49.99 | history building |
| #17 | SURVIVOR FILTER™ Active All Terrain Filtration Bottle & Carrier System Survivor Filter In stock | $0.50 | 100 gal | $49.95 | history building |
| #18 | Frontier Pro Ultralight Water Filter - Green Line (GRN-III-50-T) Legacy Food Storage In stock | $0.60 | 50 gal | $29.99 | history building |
| #19 | Puribag Monster Bug Out 4-Pack Water Purification System Uncharted Supply Co In stock | $1.26 | 127 gal | $159.99 | history building |
| #20 | Puribag 120L System Uncharted Supply Co In stock | $1.42 | 32 gal | $44.99 | history building |
Price history started Oct 17, 2026; week-over-week changes appear as it builds. Prices checked Oct 17, 2026, 6:34 AM ET at each brand's own store. Tax and shipping not included.
Sold out today (7)
- Survivor Filter SURVIVOR FILTER™ Pure 10K, Chlorine In-Line Home Filter, last price $100.00
- Survivor Filter Survivor Filter Straw Cotton Filter Pads Replacement (20 Pack), last price $9.95
- Survivor Filter SURVIVOR FILTER™ Max - Replacement Stage 2 All Tap Filter, last price $80.00
- Survivor Filter SURVIVOR FILTER™ Cleanable Water Filter Straw (Model: L600 UPC Code: 628250537437), last price $36.99
- Survivor Filter SURVIVOR FILTER SQUEEZE™ Water Filter + 2 Canteens, last price $41.99
- Survivor Filter SURVIVOR FILTER™ PRO X Electric Survival Filter, last price $99.95
- Survivor Filter SURVIVOR FILTER SQUEEZE™ Bundle Kit, last price $88.95
Prepared, not scared
Cheapest isn't always best: check what each product includes on the brand page, and buy for the household you actually have. The Kit Calculator works out how much food and water that is.
More water storage & filters rankings
Questions people ask
What is the cheapest water filters right now?
At today's prices: Survivor Filter Survivor Filter Straw Ultra Filter Replacement at $0.0006 per rated gallon ($16.95). This page updates every day.
How often is this ranking updated?
Daily. We check each brand store once a day and rebuild this page; the last check was Oct 17, 2026, 6:34 AM ET.
Why isn't my favorite brand listed?
We only collect prices from stores whose terms allow automated price checks. Brands that forbid it, such as EcoFlow, Jackery and Sawyer, are listed on our methods page.