Melbourne issued a boil-water notice in email at 9:33 p.m. Wednesday after a water main break on Riverside Drive.

"Due to this temporary drop in water pressure, as a precaution, we advise that all water used for drinking, cooking, making ice, brushing teeth, or washing dishes, be boiled. A rolling boil of one minute is sufficient. As an alternative, bottled water may be used," Melbourne Public Information Officer Cheryl Mall said in a news release.

The precautionary boil-water notice affects about 4,000 people:

Indialantic customers who live south of Fifth Avenue/U.S. 192.

All customers in Melbourne Beach.

All customers in unincorporated Brevard County south of Melbourne Beach.

The precautionary boil-water notice is expected to remain in effect until the required bacteriological survey indicates the water is safe to drink, the news release states.

The earliest that test results will be available will be Saturday. Once the initial tests are received, the city will issue an update alerting the public if the water is confirmed to be safe or if further testing is needed.