Residents in Timokhovo, about 20 miles east of the Russian capital, called on ecologists from the Natural Resources Ministry to examine why water is turning black and rising about 1.5 feet above normal levels, state news agency RIA Novosti reported Tuesday.
The news agency said residents in Timokhovo last year suffered respiratory problems following reports of a sulfur and ammonia smell in the area. The news agency said it wasn't clear what's causing the pollution though contamination from a nearby landfill was a potential source.
The news agency Sunday reported emissions from a thermal power plant in the Siberian city of Omsk were to blame for the black tinge to snow in the area.
The city was coated twice last winter with a blanket of black snow after a thermal power station dubbed TPP-5 kicked into overdrive.
The report said $4.3 million was slated for new filters at the facility.
There was no indication if the black material was a threat to either city's population.