Inorganic
Perchlorate in your water
Health effects
Perchlorate comes from rocket fuel, explosives, and some fertilizers, and is also found naturally in arid regions. It interferes with the thyroid's ability to make hormones, which is especially concerning for pregnancy and infant development. There is currently no enforceable national drinking-water limit.
The guideline vs. the legal limit
The federal legal limit is the maximum allowed by law. The EWG health guideline is what independent scientists consider safe — it is often far stricter.
Health guideline (EWG)
1 ppb
Federal legal limit (MCL)
No federal limit set
Source: EWG Tap Water Database & EPA MCLs · 2026
What removes Perchlorate
We're still cataloging certified systems for Perchlorate. A free water test is the fastest way to get a matched recommendation.
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Is Perchlorate in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.