WASHINGTON - A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history. Public-health agencies typically issue advisories in summer, when people are more likely to recreate in the water, including paddling and fishing. The rupture occurred at Lock 10, just upstream of CIA headquarters in neighbouring Virginia, creating a foul stench in the surrounding area. DC Water says there is no impact on drinking water because the Washington Aqueduct's main intake points are upstream of the break. She added that the ruptured line was built in the 1960s and that DC Water had scheduled the section for remediation under a $625 million plan, but work had not yet begun.