Due to the inaction of state and federal officials, thousands of people in Flint have been exposed to unsafe levels of lead in their water. Now a group of union plumber are taking matters into their own hands.

On Saturday, 300 plumbers from unions across the country descended on Flint to install new faucets and water filters for free.

Many Flint residents needed new faucets because their existing faucets were so old they could not accommodate water filters provided by the state.

The effort was coordinated by the United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry, known as the United Association. The fixtures were donated by the Plumbing Manufacturers International.

For some in Flint, however, even new faucets with modern water filters won’t be enough to fully abate the lead contamination. New tests released recently revealed that, in some Flint homes, the levels of lead “exceed the ability of filtration systems handed.” The filters can safely remove up to 150 parts per billion of lead. Some Flint homes were found to have lead levels of more than 4,000 parts per billion.

Residents of Flint, however, are still encouraged to use the filters. For most homes, they will work.