FLINT, MI -- Pregnant women and children under 6 are being told by state, local and federal officials to stop using tap water unless it has been tested for lead.

Officials announced during a Friday, Jan. 29, press conference that recent lead testing found 26 sites across the city with readings of 150 parts per billion or more of lead-- ten times the federal action limit.

Testing from the U.S. Department of Environmental Quality discovered at least one home with lead levels above 4,000 ppb.

The state directors of the Department of Environmental Quality and health department were in attendance. The state's chief medical executive, Dr. Eden Wells, was also in attendance at the city hall press conference.

All of the water fountains in city hall were turned off prior to the press conference.

Residents can continue to drink tap water if the water has been tested and found to be below the action level for lead.

The state claimed this week it had distributed nearly 100,000 water filters to city residents, but now says the city's pregnant and young residents should stop using any tap water if it hasn't been tested.

Filters began being handed out in Flint in August 2015 by the Concerned Pastors for Social Action after Flint had been in violation of the Safe Drinking Water Act since the start of 2015 because of elevated levels of total trihalomethanes, a byproduct of water treatment, in water samples.

The pastors initially said the filters were donated anonymously, but a month later it was discovered Gov. Rick Snyder's office helped foster the giveaway from an anonymous donor and asked the pastors not to disclose their involvement.

The state offered cash to the city in October for filters after elevated blood lead levels were discovered in some residents and Snyder signed a bill Friday appropriating more than $15 million provide emergency bottled water, filters and other services.

For more than 50 years, Flint used pretreated Lake Huron water purchased from Detroit, but in April 2014, switched to using the Flint River instead.

A state-appointed emergency manager was running Flint at the time the change was made, and the DEQ provided oversight as the city struggled to keep bacteria and total trihalomethanes out of the water supply.

In September 2015, Virginia Tech university researchers reported Flint drinking water is "very corrosive" and high rates of lead leaching from pipes and solder joints and "contamination in homes."

Also in September, a Hurley Medical Center doctor's study showed the number of children in the city with elevated blood levels of lead nearly doubled after the city started using the river as a water source and nearly tripled in two "high-risk" ZIP codes where lead in water levels have been especially high: 48503 and 48504.

The governor activated the National Guard to assist in the crisis on Jan. 12 and President Barack Obama signed an emergency declaration Jan. 16 ordering federal assistance over the crisis.

(Staff writer Gary Ridley contributed to this report)