Drought conditions are worsening an already concerning situation at Falls Lake, where water levels continue to recede, exposing more sandbars and shoreline.
People become infected by breathing in contaminated mist or vapor, not through person-to-person contact, DHHS says.
The City of Durham is in good shape water-wise, but officials ask residents to use water wisely.
Raleigh Water customers in Garner, Knightdale, Rolesville, Wake Forest, Wendell, and Zebulon are included in the restrictions.
Johnston County Public Utilities is urging people to cut back on using water because of a shortage caused by the extreme cold.
Business owners and Cumberland County leaders say the plan could have lasting consequences for the region's water supply, recreation, and economy.