The City recognizes the changing aesthetics of the drinking water, which is common with surface water supplies. Starting on March 5th our State Water Project supply source (Delta water) will be unavailable for three weeks to perform maintenance which necessitates using our Lake Hennessey water. The taste and odor is not unique to Napa’s water sources – seasonal algae blooms are common to many surface waters. As algae dies off they release odor causing compounds. Most persons describe the aesthetics of this phenomenon as earthy and/or musty.