Filmmaker and Flint native Michael Moore held a press conference on the steps of the Flint City Hall and called for the arrest of Governor Snyder

TWO state regulators and a Flint employee have been charged with evidence tampering and other felonies and misdemeanours, for the first time raising the lead-tainted water crisis in the Michigan city to a criminal case.

Months after officials conceded that a series of bad decisions had caused a disaster, charges were filed against a pair of state Department of Environmental Quality employees and a local water treatment supervisor and stem from an investigation by the office of Michigan Attorney General Bill Schuette.

“They failed Michigan families. Indeed, they failed us all,” Mr Schuette said. “I don’t care where you live.”

He added, with certainty, that there will be more charges — “I can guarantee you” — but did not provide a timeline.

For nearly 18 months, the financially troubled city of Flint, where the majority of residents are black, used the Flint River for tap water as a way to save money — a decision made by a state-appointed emergency manager — while a new pipeline was under construction. But the water wasn’t treated to control corrosion. The result: Lead was released from ageing pipes and fixtures as water flowed throughout the city of 100,000 residents.

Governor Rick Snyder, a Republican, didn’t acknowledge the problem until last year when tests revealed high levels of lead in children.

A task force appointed by the governor recently said the crisis was a “case of environmental injustice.”

Flint played a key role in the Democrats’ presidential nomination race in March, when Michigan held its primary, with Hillary Clinton and Bernie Sanders debating in Flint and taking turns lambasting the Snyder administration.

Michael Prysby, a DEQ district engineer, and Stephen Busch, who is a supervisor with the DEQ’s Office of Drinking Water, were both charged with misconduct in office, conspiracy to tamper with evidence, tampering with evidence and misdemeanour violations of water law.

They’re both accused of failing to order chemicals to control corrosion. Michigan environmental regulators have acknowledged misreading federal regulations and wrongly telling the city that the chemicals were not needed.

Flint utilities administrator Michael Glasgow also was charged with tampering with evidence for changing lead water-testing results and wilful neglect of duty as a public servant.

Busch is on paid leave after being suspended earlier.

Prysby recently took another job in the agency.

Glasgow testified at a legislative hearing that Prysby told him phosphate was not needed to prevent lead corrosion from pipes until after a year of testing.

Flint has been under a state of emergency for more than four months, and people there are using filters and bottled water.

In addition to the lead contamination, outside experts also have suggested a link between the Flint River and a deadly Legionnaires’ disease outbreak.

There were at least 91 cases, including 12 deaths, across Genesee County, which contains Flint, during a 17-month period.

That represents a fivefold increase over what the county averaged before.

State officials were slow to respond to experts’ and residents’ concerns. After the crisis broke open, DEQ Director Dan Wyant and his spokesman, Brad Wurfel, resigned. Snyder announced the firing of Liane Shekter Smith, the former chief of the DEQ’s Office of Drinking Water and Municipal Assistance.

Susan Hedman, the director of the US Environmental Protection Agency’s Chicago-based Midwest office, also resigned.