The city of Premont is under a water boil advisory.
The mayor issued a notice on Thursday afternoon advising residents that boiling the water will ensure destruction of all harmful bacteria and other microbes.
The contamination is being blamed on low water pressure.
Residents using the water for cooking, ice or to drink should bring water to a vigorous, rolling boil and then boiled for two minutes.
According to the notice, residents can also purchase bottled water or obtain water from some other suitable source.
Premont Vol Fire Department says the water does not need to be boiled for bathing or to wash clothes.
Premont ISD posted to its social media site that it will operate school as usual on Friday.
Schools will provide bottled water to students.
The mayor notes that water system officials will notify residents when the water is safe for consumption.