(CNN)-- Chicago parks shut off hundreds of drinking fountains because of high levels of lead.
Lead levels higher than the EPA's standard for drinking water were found in 459 water fixtures --445 were outdoor fountains and 14 were indoors.
In a statement, the Chicago Park District said: "ensuring the health and safety of all park patrons and staff is a top priority."
Park officials say the fountains will be removed, replaced or repaired as needed.
All drinking water sources in the park system were tested.
The source of the lead contamination has not been determined.
Cool through Tuesday with wind and periods of rain, then a warming trend.
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