A federal judge has ruled that an Eastern Washington dairy contributed to groundwater contamination in the area.

U..S. District Judge Lonny Suko made the ruling on Dec. 30 against Nelson Faria Dairy, located 45 miles northeast of Yakima, Wash. 

"Faria's manure management practices have caused or significantly contributed to the excessive nitrate contamination of the local groundwater, as observed and documented by (Community Association for Restoration of the Environment's) monitoring wells," Judge Suko wrote.

The 3,000-cow dairy includes four large barns and several lagoons and feedlots. The Faria family, who owns and leases large dairies in New Mexico, Washington and Texas, purchased the Washington dairy from Smith Brothers for $16 million in 2006, according to the Associated Press