In 2015 and 2016, the Michigan DEQ was criticized for its role in the Flint water crisis; agency officials repeatedly dismissed citizens' concerns about water quality in Flint, leading to a delay in addressing lead poisoning in the city's water supply. The DEQ also revised water samples to wrongly indicate that the water was safe, changing the lead-level results from unacceptable to acceptable, delaying action. DEQ Director Dan Wyant acknowledged in October 2015 that the department had failed to follow the relevant federal regulation and had made other errors.