Independent water filter guides
Most filters are sold on taste. GudWater starts from your water report, checks NSF/ANSI certifications, and cites the EPA and peer-reviewed research, so you don't pay for a filter that solves the wrong problem.
Pick the problem first. The right filter type follows from it.
Six designs, from a $25 pitcher to a whole-house system. Each card lists the certifications that matter for it.
Better taste, renters, small households, and some lead or PFAS reduction depending on the cartridge.
Filtered water on demand without plumbing work.
Households that drink a lot of tap water and want more capacity with less upkeep.
The broadest reduction, including PFAS, nitrate, arsenic and dissolved solids.
Renters who want more capacity than a pitcher, or households preparing for emergencies.
Chlorine taste in showers, sediment, hardness, and well water treatment.
What each brand makes, and what to check before you buy.
Every guide lists its sources and the date we last checked them.
A plain comparison of reverse osmosis, under-sink carbon and pitcher filters: what each reduces, upkeep, water waste and cost, plus a quick way to decide which one fits your water.
Reverse osmosis and two-stage filters removed 94% or more of PFAS in a Duke and NC State study, while carbon pitchers were inconsistent. Here's what that means, plus the current EPA PFAS rules.
What NSF/ANSI 42, 53, 58, 401, 44, 55 and 244 mean on a water filter box, why the standard number alone isn't enough, and how to check a model's certified claims in two minutes.
There is no known safe level of lead exposure. Learn where lead in tap water comes from, how to test, the new 10 ppb federal action level, and how to pick a filter certified for lead.
EPA limits for lead and PFAS are changing over the next few years. Get a short email when something changes that affects which filter you should use. No spam, unsubscribe anytime.