SAN MARCOS, Texas—A break in a main has prompted San Marcos to issue a boil water notice.

A statement from the city of 35,000 says the boil water notice is in effect until at least midday Friday as testing continues.

The Texas Commission on Environmental Quality required the San Marcos water system to issue the boil notice due to low system pressure and water outages.

Crews located and isolated the water main break Wednesday night.

The boil water notice means there is a possibility of contamination due to lack of pressure in the main lines for an extended period.

San Marcos, located 30 miles south of Austin, says water for drinking, cooking and ice should be boiled and cooled prior to consumption.