"There was no breach of a dam in Dernau", the district administration tweeted.
Police in the nearby city of Koblenz said dams near the towns of Bad Neuenahr-Ahrweiler and Sinzig stood firm, following massive floods that swept the western state of Rhineland-Palatinate this week.
"There is no reason for panic! No flood wave or dam collapse in Sinzig, Ahrweiler and their surroundings", a police statement read.
Suedwestrundfunk radio reported that the rumours caused panic in the district, prompting people to flee their homes. This comes a day after police said looting was on the rise in German towns after they were evacuated in the wake of devastating floods.