A boil water notice has been lifted for the communities of Arroyo Grande, Grover Beach and Oceano, and customers of the San Miguelito Mutual Water Company.
According to the County of San Luis Obispo, further testing by county and State Water Resources Control Board officials has found that the water is safe to drink in those areas.
The order remains in place for Pismo Beach and Avila Beach.
The boil water notice was issued on Wednesday after testing on water samples repeatedly found the presence of coliform bacteria in the Lopez Water Distribution System, the county reported.
A County Public Works representative told KSBY News that E. coli was found to be present in the water system.
Those who remain under the boil water order are advised to use bottled water or boil their water following these instructions:
Boil all water for one (1) minute (rolling boil). Let water cool before drinking. Use boiled or bottled water for drinking, brushing teeth, and food preparation until further notice. Boiling water kills bacteria and other organisms in the water.