Lead has been found in the water at a total of 75 Chicago public schools, after 20 new schools were added to the list Friday.
The district has informed parents whose children attend schools with elevated lead levels, according to a statement from Chicago Public Schools.
CPS officials said testing has now been done at all 324 school buildings that have pre-k programs and were built before 1986.
Testing results have thus far come back for 4,000 school water fixtures, and 130 of them have had high lead levels.
Lead testing results for Chicago public schools can be found here.