UpdatedSat, Jun 12, 2021 at 6:03 am MT Reply Tucson Mayor Regina Romero, backed by city residents and state and local officials, announces plans to shut down a water treatment facility to protect it from the chemical PFAS. (Photo Courtesy of the City of Tucson) TUCSON, AZ – Tucson officials said they will indefinitely suspend operations at one of the city's water treatment plants to keep it from being overwhelmed by an underground toxic chemical plume. City officials assured residents in a news conference Tuesday that water from the Tucson Airport Remediation Project treatment plant is safe, and that the decision to stop operations there on June 21 is merely a precaution against high levels of the chemical PFAS that could be moving toward the plant.