To comply with the EPA 's Total Coliform Rule of 1990 , the water bureau must collect .
To comply with the EPA 's Total Coliform Rule of 1990 , the water bureau analyze at least 210 water samples each month from its distribution system .
To comply with the EPA 's Total Coliform Rule of 1990 , the water bureau must collect and analyze at least 210 water samples each month from its distribution system .