AT&T has agreed to remove some six miles of lead cables that have been submerged in Lake Tahoe for decades, per a settlement agreement.

Per multiple news reports, AT&T will remove approximately 107,000 pounds of unused cables in the agreement with the California Sportfishing Protection Alliance (CSPA), which in a 2021 lawsuit claimed that lead from the cables was contaminating multiple areas of the lake and creating a widespread risk of exposure. Elevated levels of lead were confirmed in both the water and sediment around the cables, according to the lawsuit. Lake Tahoe, a freshwater lake in the Sierra Nevada, straddles the border between California and Nevada.

CSPA said that the paper-wrapped copper wire cables are composed of spiral-wound steel rods and coated with a fiber layer impregnated with bitumen tar. Each foot of these cables has about 3.39 pounds of lead, and there are about six miles of submerged cables. A study by scientists hired by the CSPA’s attorneys found that biofilms (algae) that are a food source for fish had lead concentrations 67,000 times higher in samples taken from the cables compared to those taken from a rock.

AT&T maintained that multiple expert analyses found that the telecom cables in the lake pose no threat to public health or the environment. “While we’re confident in the strength of our case and the safety of the cables, this settlement represents an amicable resolution to litigation.”

The cables were discovered 12 years ago by divers on the sandy bottom of the lake by the Pacific Bell Telephone Company a century ago. Three years ago, the California Sportfishing Protection Alliance (CSPA), a nonprofit advocacy group, sued AT&T to have them removed after their discovery.