Solutions
The Best Water Filters for Every Contaminant
Not all water filters are created equal — and you may not need one at all. This guide matches filter types to specific contaminants so you can buy the right filter for what's actually in your water, not what marketing says you should be afraid of.
Start With Your Water, Not the Filter Aisle
Before buying any filter, check what's in your water. Search your zip code on IsWaterSafe or read your Consumer Confidence Report. If your water system has an A or B safety score with no violations, a basic pitcher filter for taste improvement (removing chlorine) is all most people need.
Filter Types: What Removes What
Pitcher Filters ($20-50)
Standard pitcher filters (Brita, PUR) use activated carbon to remove chlorine taste and odor, some lead, and some organic chemicals. They do NOT remove: most PFAS, nitrate, fluoride, bacteria, or dissolved minerals. ZeroWater pitchers use ion exchange and remove more contaminants, including dissolved solids, but filters need replacing more frequently.
Faucet-Mounted Filters ($20-40)
Attach directly to your faucet and filter water on demand. Similar performance to pitcher filters but more convenient — no waiting for water to filter through. Look for NSF 42 (chlorine/taste) and NSF 53 (lead, cysts) certifications.
Under-Sink Reverse Osmosis ($200-500)
Reverse osmosis is the most comprehensive home water treatment. It removes 95%+ of virtually everything: PFAS, lead, arsenic, nitrate, fluoride, bacteria, viruses, dissolved minerals, pharmaceuticals, and pesticides. The downside: it produces waste water (3-4 gallons per 1 gallon filtered) and removes beneficial minerals.
Whole-House Carbon Filters ($500-2,000+)
Treat all water entering your home. Use granular activated carbon to remove chlorine, some organic chemicals, and improve taste throughout the house. Good for homes with strong chlorine taste or sediment. Not effective for lead, nitrate, or most PFAS without additional specialized media.
What Filters Do NOT Remove
Common misconceptions:
- Boiling: Does NOT remove PFAS, lead, nitrate, or any chemical contaminant. Only kills pathogens
- Basic carbon (Brita-style): Does NOT remove nitrate, fluoride, most PFAS, dissolved metals, or bacteria
- UV treatment: Kills bacteria and viruses but does NOT remove any chemical contaminants
- Water softeners: Remove calcium/magnesium (hardness) but do NOT remove contaminants
Certification: How to Know a Filter Works
Look for NSF/ANSI certifications on any filter you buy:
- NSF 42: Chlorine taste and odor
- NSF 53: Lead, cysts, specific contaminants
- NSF 58: Reverse osmosis — comprehensive contaminant removal
- NSF P473: PFAS removal — the critical certification for forever chemicals
- NSF 401: Emerging contaminants (pharmaceuticals, pesticides)
Related Resources
Frequently Asked Questions
Check your water system on IsWaterSafe first. If your system has an A or B safety score with no health violations, a basic pitcher filter for taste improvement is all you need (or no filter at all). If your system has violations, contaminant exceedances, or you're on a private well that hasn't been tested, consider a more targeted filter based on your specific contaminants.
For lead specifically, an NSF 53-certified pitcher filter (like ZeroWater or certain Brita models) or a faucet-mounted filter works well and is the most affordable option. For comprehensive lead removal plus other contaminants, an under-sink reverse osmosis system is the best choice. Also: running cold water for 30 seconds before filling your glass flushes lead that accumulated from sitting in pipes.
Whole-house filters make sense if your water has sediment, chlorine taste throughout the house, or broad contamination issues. For specific contaminants like lead or PFAS, a point-of-use filter at your kitchen tap is more cost-effective — you only need to filter the water you drink and cook with, not the water for toilets and laundry.