Nov 21 (Reuters) - A grand jury has indicted Phillips 66

for violating the Clean Water Act by illegally

discharging hundreds of thousands of gallons of industrial

wastewater into Los Angeles County's sewer system and failing to

report the violations to authorities, the U.S. Attorney in Los

Angeles said on Thursday.

Phillips 66 is expected to be arraigned in the coming weeks

in Los Angeles federal court. It faces a maximum sentence of

five years probation on each count and up to $2.4 million in

fines.

(Reporting by Jonathan Stempel in New York)