In recent weeks, some Fremont residents have noticed a yellowish tinge to their water. We hope to correct this problem and reduce the possibility of future discolored water episodes by cleaning selected water mains from February 25 - March 11. In the meantime, we want you to know that your water remains safe to drink and continues to meet all state and federal water quality standards.
This discoloration is caused by manganese which is a naturally-occurring mineral in raw water supplies. Manganese concentrations can vary seasonally and we are currently experiencing higher levels than normal. This can cause the yellowish tinge.
While increased manganese levels may cause your water to look slightly yellow, other events, such as a broken fire hydrant or water main cleaning may temporarily cause a brownish-black discoloration. If you notice such discoloration, please contact ACWD at (510) 668-6500.