City of Lasalle issued the following announcement on May 1.
Hydrants will be flushed in the City of La Salle on May 6th - May 9th. Monday, May 6th - East of Int. 39, Tuesday, May 7th - Canal St. to 9th St., Wednesday, May 8th - 9th Street to O'Conor, Thursday, May 9th - O'Conor to North of O'Conor. If you have water discoloration, let your water run until it's clear.
Original source can be found here.
Source: City of Lasalle