Grand Coteau under boil water advisory due to main water line break, schools will go virtual Water will be shut off on Wednesday KATC and last updated 2021-02-23 17:15:02-05 GRAND COTEAU, La. â The Town of Grand Coteau is under a Boil Water Advisory until further notice. The town says that the advisory is due to a main water line break. Water will be tuned off on Wednesday February 24, 2021 from 8:00 am until possibly 12:00 noon for repairs. The shut off may take longer, they say. Residents may have low water pressure or none at times during the day and evening. Town officials say that the Utilities Department is working on keeping running water working throughout Tuesday before the shut off.