Airborne organisms are usually the cause.
You will see grey, black, or sometimes pink film on surfaces that are regularly moist, including toilet bowls, showerheads, sink drains, dishwashers, and shower tiles.
These organisms are controlled with normal drinking water disinfectants and, therefore, are not found in the water but can come from dust or dirt that is airborne.
Regular cleaning and ventilation should reduce these nuisance organisms.
Simple steps you can take at home to prevent water pollution.
Signage installed at Griggs, O'Shaughnessy & Hoover Reservoirs invites park visitors to take a self-guided tour along the shoreline & learn about the green infrastructure installed there.
Rain gardens, porous pavement & more can improve the quality of storm water entering the reservoirs that supply our drinking water.
Protect our Waterways Illustration Courtesy of NCDENR