Residents have been notified not to use the water in Las Lomas due to it being contaminated with high levels of mercury, posing a major health risk.
Nearly 3,000 residents have been notified not to use the water under any circumstances.
The California Water Service Company is working hard to try and determine the source of the problem and how they can fix the water supply from here.
Over the weekend, a water tank was vandalized and could have played a role in the contamination of the water.
Mercury in the water can cause major health problems including cardiovascular disease and neurological events.