Contaminants

Drinking Water Contaminants

What's in tap water, what the rules say, and which filters are certified to remove each contaminant.

Chlorine in Drinking WaterWhy utilities add chlorine and chloramine, what the CDC and EPA say about safety and byproducts, and the filters certified to reduce each.
Fluoride in Drinking WaterWhy fluoride is added to tap water, what is settled and what is debated, the 2025 and 2026 federal and state changes, and how to remove it.
Hard WaterWhat hard water is, the USGS hardness scale in mg/L and grains per gallon, why it isn't a health concern, and which fixes work.
Iron in Drinking WaterWhere iron in water comes from, the types and signs, what the EPA, WHO, and Health Canada say, and the treatments that remove it.
Lead in Drinking WaterWhere lead in tap water comes from, what the EPA and WHO say about its risks, the 2027 rule changes, and the filters certified to reduce it.
Sodium in Drinking WaterWhere sodium in water comes from, how much a softener adds, what the EPA, WHO, and Health Canada advise, and the treatments that reduce it.
Tap Water ContaminantsThe contaminants found in US tap water, their EPA limits, what isn't regulated yet, and how to find out what's in your own water.
TDS in Drinking WaterWhat TDS in water measures, the EPA guideline and WHO taste ratings, why the number alone isn't a health score, and the treatments that lower it.