DES MOINES, Iowa —

About a month ago, the lawn watering ban ended for Central Iowa Water Works customers .

It took until Aug. 25 for nitrate levels in all three main water sources to get below 10 milligrams per liter and stay below.

Those lower numbers continued into September.

KCCI Investigates requested the August data on nitrates from the regional water authority. The readings show nitrate levels dropped from Aug. 1 through Sept. 3 for the Des Moines and Raccoon rivers and infiltration gallery.

That infiltration gallery is the pipe under Water Works park that brings groundwater in for treatment.

Central Iowa Water Works this summer said at least one of those sources had to be consistently below the EPA threshold of 10 mg/l for a sustained time for the ban to be lifted.

The ban

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