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Most recreational water advisories along the Potomac River in Virginia and Maryland have been lifted after testing showed acceptable bacteria levels, but officials continue to warn people away from parts of Montgomery and Fairfax counties.

The advisories followed a sewer line failure that sent hundreds of millions of gallons of raw sewage into the river on Jan. 19.

The Maryland Department of Health announced Thursday that it had lifted advisories in Prince George’s and Charles counties. Montgomery County’s advisory remains in effect, while St. Mary’s County does not need one because it is outside the affected plume area.

Virginia also partially lifted its advisory Thursday. Restrictions remain along a nearly five-mile stretch between the American Legion Memorial Bridge in Fairfax County and the Route 120 Chain Bridge.

The broader advisory, issued Feb. 13, had extended from the American Legion Bridge to the Harry Nice Memorial Bridge in King George County.

Virginia officials said samples collected Feb. 17, 25, 26 and 27 showed bacteria concentrations at levels considered acceptable for recreational use.

Officials in both states stressed that swimming in the Potomac or any natural body of water carries some risk because the water is not disinfected. They said the sewage spill has not affected drinking water.

“As we approach spring with more people spending time outdoors, we will continue to evaluate the testing results and provide the public with actionable and timely health guidance based on the latest available data and science,” Maryland Health Secretary Dr. Meena Seshamani said.

People should continue avoiding contact with water in areas under advisory, as well as places with foul-smelling water or dead fish. Officials also recommend keeping pets away, promptly washing exposed skin and seeking medical care if health problems develop after contact.

Maryland and Virginia officials will continue monitoring water quality. Washington, D.C., lifted its recreational water advisory Monday.