Risks For Babies As Nitrate Levels Soar

"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."

Farm operations are considered largely to blame for nitrate contamination, both because of the runoff of fertilizer applied to fields of corn and other crops, and the runoff of liquified manure generated by large livestock operations that is also often spread on farm fields. The runoff carries nitrates and phosphorus into surface and groundwaters, and ultimately into drinking water.

In addition to concerns about impacts on babies before and after they are born, a growing body of literature indicates potential associations between nitrates and an increased risk of cancer.