By Denis Cuff, Contra Costa Times, Walnut Creek, Calif. May 28--The East Bay Regional Park District has banned out-of-state boats from its recreational lakes in the latest crackdown by a local agency to prevent two non-native mussels from infecting new waters in California.

By Denis Cuff California, where water and recreation often mix, is struggling to devise a plan to defend its lakes and rivers from invasions by tiny quagga and zebra mussels, which threaten to wreak havoc on the environment and water-delivery systems.

By Denis Cuff The East Bay Municipal Utility District will restrict recreational boating in six reservoirs to prevent the spread of two non-native mussels that have caused havoc in waterways in many states, EBMUD officials announced Thursday.

By Denis Cuff The East Bay Municipal Utility District will restrict recreational boating in six reservoirs to prevent the spread of two non-native mussels that have caused havoc in waterways in many states, EBMUD officials announced Thursday.

By Denis Cuff, Contra Costa Times, Walnut Creek, Calif. Jan. 25--The East Bay Municipal Utility District will restrict recreational boating in six reservoirs to prevent the spread of two non-native mussels that have caused havoc in waterways in many states, EBMUD officials announced Thursday.