The City of Sierra Madre’s existing water supply comes from one of two sources; tunnel water from the local dam (5-10%) and groundwater wells (90-95%.) Throughout the summer and fall of 2012 City Public Works staff observed the water levels receding at each of the City’s four wells, which make up the area aquifer.
Normally, rainfall throughout the winter months reduces customers’ irrigation water use and provides water to recharge the aquifer. Aquifer water levels therefore tend to increase during the winter and spring months. This year’s minimal rainfall, combined with Los Angeles County Public Works diverting water from Santa Anita Dam to locations outside of Sierra Madre, has resulted in limited water for groundwater recharge at the City’s spreading basins.
Overall, resident water consumption is up from last year. During the period April 24th through 30th the Water Department produced 2.56 million gallons of water a day resulting in a 2 foot drop in water level within local wells. The same period last year showed a production of 1.5 million gallons a day. During the month of April 2013, the department produced a total of 70 million gallons versus production of 46 million gallons in April 2012. Well water levels dropped over 30 feet within that 12 month period.