Although the algae have been found in the causeway, the release says it has not been found in the reservoir itself, which supplies drinking water to the city of Cheyenne.
Washing hard surfaces, such as sidewalks, parking lots or driveways with a hose is prohibited except when needed for safety, health or construction-related reasons.
A spokeswoman for the Cheyenne Board of Public Utilities (BOPU) says the utility's payment drop box was vandalized and the contents were stolen early this (Wednesday) morning.