06/10/2026
CHRONIC NITRATE POLLUTION, NOT DROUGHT, PROMPTED OUTDOOR WATERING BAN
Nitrate pollution has remained above legal limits since the beginning of the year. Des Moines Water Works runs extra equipment to reduce the nitrates.
But the utility company can only treat a certain amount of gallons per day. So an outdoor watering ban has been announced to reduce the use of water.
The established limit for nitrates in drinking water is 10mg/L. That standard is set by the US Environmental Protection Agency. Nitrates must be reduced below that level before it can be delivered as tap water to homes and businesses.
In Des Moines, water comes from two rivers, the Raccoon and the Des Moines. They have had nitrate levels above the established limit nearly every day this year.
This week, for example, the Raccoon has been registering at more than 13mg/L, according to the US Geological Survey. The Des Moines River has been above 10mg/L this week.
Photo from Iowa Public Radio