Mass fish deaths in Arlington linked to error at water pollution control plant

Officials with the Arlington Department of Environmental Services alerted members of the public to a "fish kill" Wednesday morning. They said it happened along Four Mile Run, between Mount Vernon Avenue and Route 1, adding that people should "avoid contact with the water for at least the next 48 hours." By early Wednesday evening, the officials had declared Four Mile Run "safe," explaining in a release that "a manual operation error at the County’s Water Pollution Control Plant released higher-than-usual levels of sodium hypochlorite into the waterway." The release also...