"New research out of Iowa adds to a wide body of evidence showing that when pregnant women are exposed to nitrates in drinking water, it raises the risks of problematic birth outcomes, including low birth weights and pre-term birth.

The study, published June 25 in PLOS Water, found that the risks persist even when exposures are lower than the regulatory standard for allowable levels.

It comes as the US farm state wrestles with near-record levels of nitrates in prominent waterways, and as residents increasingly question high levels of cancer and other health problems occurring across Iowa.

Nitrate levels have been so high recently in key Iowa rivers that in June, public health officials banned about 600,000 businesses and homeowners in central Iowa from watering lawns to limit demands on utility operations seeking to filter nitrates from water for household use."

Carey Gillam reports for The New Lede June 30, 2025. [2]