On Aug. 23, the Navajo Nation Environmental Protection Agency announced that its Criminal Enforcement Department is working to address a case of illegal trash dumping in the community of Black Mesa, Arizona, which is in violation of the Navajo Nation Solid Waste Act, and will seek prosecution of the perpetrators.On Aug. 23, the Navajo Nation Environmental Protection Agency announced that its Criminal Enforcement Department is working to address a case of illegal trash dumping in the community of Black Mesa, Arizona, which is in violation of the Navajo Nation Solid Waste Act, and will seek prosecution of the perpetrators.