Clean water starts with knowing what's in it.
Whether you're on a private well or city water, we match the fix to your actual problem — iron, sulfur, hardness, arsenic — and rank systems by what they remove and what they cost to own.
- Independent Systems ranked by what fixes your water and what it costs to own.
- Standards-checked Every recommendation weighed against NSF/ANSI certifications and EPA limits.
- Honest about limits We cite specs, lab standards, and real owner reports — and say what we haven't tested.
Start with your water
Three common situations. Pick the one that sounds like you, and we'll take you to the right place — diagnosis first, then the fix.
Diagnose my well water
A 90-second quiz points you to the likely cause — iron, sulfur, hardness, arsenic — and how to confirm it. No email required.
Take the quiz →Diagnose my city water
Chlorine taste, scale, discoloration, or a lead worry? A 90-second quiz reads the signs at your tap and points you to your utility’s free report and the test it can’t replace.
Take the quiz →Better drinking water
Taste, odor, and dissolved contaminants at the kitchen tap — reverse osmosis and under-sink filters.
See the options →Browse by category
Independent buyer's guides, grouped by the system or the problem they cover.
Which system do you need?
Not sure where to begin? Match your water source and symptom to the right type — softener, carbon, iron filter, reverse osmosis, or UV — in one place.
See the guide →Well water
Iron, sulfur, hardness, arsenic and more — diagnose it, then match the fix.
Browse →Softeners & hard water
Salt-based and salt-free systems for scale, spots, and dry skin.
Browse →Reverse osmosis
Point-of-use reverse osmosis for nitrate, arsenic, and high TDS.
Browse →Contaminants
Match a symptom to the contaminant behind it, then the treatment that removes it.
Browse →Under-sink filters
Reverse osmosis and carbon filters for cleaner, better-tasting water at one tap.
Browse →Latest guides
All guides →Every guide traces its recommendation back to a specific contaminant and a real ownership cost — never a brand deal.
Best Water Filter Pitchers (2026): Certified for Lead, or Just for Taste?
Which pitchers are certified for lead and PFAS, and which only fix taste? Certified picks, why ZeroWater costs most to run, and a cost-per-gallon table.
Read the guide →Best Drinking Water Filtration System (2026): Clean Water at the Tap You Drink From
The best drinking water filter treats one kitchen tap. Our point-of-use picks by format and certification, real costs, and when to skip reverse osmosis.
Read →Best Water Softeners for Well Water (2026)
Water softeners ranked for well water, where hardness comes with iron, sulfur, or sediment. Matched to your water and weighted by real ownership cost.
Read →Bacteria in Well Water: What a Positive Test Means and How to Fix It
Bacteria in well water is colorless and odorless, so a lab test is the only way to know. Here's what a coliform or E. coli result means and how to fix it.
Read →