The Inspector General of the Environmental Protection Agency is beginning an audit of controversial billboards in Washington State which alleged water pollution was the result of agriculture. Politico says the billboards were funded by a grant from the EPA and were part of the “What’s Upstream” campaign by the Northwest Indian Fisheries Commission. An EPA official has already acknowledged that the billboards likely violated the agency’s rules because they did not disclose EPA involvement. Agricultural groups have charged that the billboards amount to lobbying, which is a violation of Federal law. The EPA has already been found guilty of one such anti-lobbying violation with its social media campaign promoting the Waters of the U.S. Rule.