Residents in the city of Heidelberg, Germany recently noticed their tap water started to exhibit a strange, blueish hue. One local conducted a PH test and found the water to be highly acidic, which is very unusual: According to German news site Mannheimer Morgen: drinking water should not be used or consumed due to an “unknown contamination” until further notice. Twitter user @powtac reports the city”s fire department is actually driving around and warning residents about the blue water: Feuerwehr macht jetzt Durchsagen auf der Strau00dfe. Vermutlich fu00fcr die Offliner. #Heidelberg #Trinkwasser pic.twitter.com/JeRzvMvYqs – Simon Bru00fcchner (@powtac) February 7, 2019 official website The immediately initiated investigations are not critical. The authorities assume that it is a discoloration based on the natural variation in the composition of the water. Very strange Main Image Credit: Infowars 246 views