Is atrazine weed killer getting into drinking water?

What's actually in it

Atrazine is one of the most widely used herbicides in the U.S., applied to corn and sorghum fields. It dissolves in water and travels into groundwater and surface water. Because it's used in large agricultural areas, it gets into the water supplies that communities draw from for drinking water.

Atrazine is an endocrine disruptor. It interferes with estrogen signaling, affects puberty timing, and has been linked to menstrual irregularities. The EU banned it. The U.S. allows it with an EPA limit of 3 parts per billion in drinking water.

What the research says

A 2026 review in Int J Environ Res Public Health summarized biomonitoring studies tracking atrazine and its metabolites in human blood, urine, and sweat. Researchers found atrazine detectable in human biosamples in exposed populations, confirming that the chemical is being absorbed from drinking water and food. Urinary atrazine metabolites are the most reliable marker of recent exposure.

A solid carbon block or reverse osmosis water filter removes atrazine from tap water before you drink it. The pitcher filters with basic activated carbon are less effective at removing it.

Store filtered water in glass food storage or stainless steel rather than plastic to avoid adding plastic chemical exposure on top of what's already in tap water.