When water appears gray or black it is typically caused by a disturbance of sediment in the pipeline. The discoloration is caused by presence of manganese. Manganese is naturally occurring sediment and is an aesthetic issue. The presence of manganese sediment is not an indicator that the water is unsafe or that the integrity of the water main has been compromised. A disinfectant residual is maintained at all times to ensure that the water is safe for household use, including cooking and drinking. If you experience this type of discolored water take precautions to clear the lines to your laundry facility to prevent articles of clothing from becoming stained. Please call MCWD at (760) 934-2596 to report any discoloration lasting longer than 24 hours with internal flushing or clears but returns every few days.