An inflatable dam on Alameda Creek in Fremont was damaged May 21st, allowing water that would otherwise have served the Alameda County Water District to flow into the San Francisco Bay.
The Fremont Police Department has been investigating the incident, but now the U.S. Environmental Protection Agency is stepping in as well.
The episode has also prompted the EPA to look into whether the federal Safe Drinking Water Act was violated, EPA spokeswoman Suzanne Skadowski said. That law makes it a crime to tamper with a public water system.
According to the EPA's website, the penalty for the crime is 20 years in prison.