A San Joaquin water district says it may have found a powerful tool in the fight against California’s growing golden mussel problem. The Arvin-Edison Water Storage District says a large-scale copper-based treatment successfully killed golden mussels found throughout the areas of its water system that were treated before farmers experienced disruptions to their water deliveries. … The district turned to a copper-based product called Natrix CA, using it in a 30-day treatment across its water system. … The first 30-day treatment cost the district about $3 million. … [T]he next round of treatment is expected to cost about $1.3 million, with the district anticipating two to three treatments each year.

Other golden mussels news:

• The Enterprise-Record (Oroville, Calif.): Invasive mussel found in Sacramento area, Lake Oroville remains free
• The Sacramento Bee (Calif.): What to know about the golden mussels invading California’s waterways