Seasonal taste and odor in drinking water

The City of Mesa can experience seasonal taste and odor problems associated with the drinking water.  The safety of the water is not at risk; however, some individuals may perceive that the water is unsafe to drink because it has an unpleasant smell or taste.  Customers often describe the taste and smell as “musty-dusty or earthy.”  The primary causes are Geosmin and Methylisoborneol (MIB), which are non-harmful, naturally-occurring compounds associated with algae growth in lakes and canals.

To help eliminate taste and odor problems, powdered activated carbon (PAC) is added during the water treatment process.  Regular analysis of water samples helps determine how much PAC to use, and identifies necessary adjustments to the treatment process.

The City’s goal is to eliminate taste and odor problems associated with the drinking water.  We will continue to use new technologies, and improve existing processes to meet this goal.