Mike Householder ?and Jeff Karoub

FLINT, Mich.: Federal officials warned Flint residents Friday that water samples from more than two dozen locations have higher lead levels than can be treated by filters that have been widely distributed to deal with the city’s contamination crisis, underscoring the need for all residents to have their water tested.

Dr. Nicole Lurie of the U.S. Department of Health and Human Services said the lead level in some Flint locations has exceeded 150 parts per billion, which is the level for which water filters are graded. In one case, it was in the thousands. She said people with levels over 150 ppb were being notified and their water is being retested.

Tests began in the last week of December, and 26 sites out of about 4,000 showed the higher levels. The water was tested by officials before it got to a filter, and Lurie stressed that the results do not mean officials think there’s a problem with the filters.

“We still have confidence in the filters,” said Mark Durno of the EPA. “If you have not had your water tested, get it tested now.”

Officials stressed that pregnant women and children under 6 should only drink and prepare food with bottled water.

Improperly treated water leached lead from pipes into drinking water after Flint switched from Detroit’s water system to the Flint River in 2014 to save money while under state financial management. Some children’s blood has tested positive for lead, which has been linked to learning disabilities, lower IQ and behavioral problems. Flint has reconnected to Detroit’s system for now.

Flint residents have been told to drink only filtered or bottled water because of the lead contamination in the city’s supply.

County health officials had declared a public health emergency Oct. 1, and the next day Gov. Rick Snyder announced $1 million for home water filters.

On Friday, Snyder signed into law $28 million more in emergency funding to address Flint’s lead-contaminated water.