One area resident told Townsquare Media that the damage to her family's home has been estimated at $80,000, and she says their insurance won't cover the cost of the damage.
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.