A sewer district worker leads the path with a light down an old 19th-century sewage tunnel

infrastructure sewer sewage clean river clean lake sewer district northeast ohio cleveland cleveland water cleveland power northeast ohio sewer district tunnel tunnels brick brick tunnels sewer system water water lines public water public health tunnells waterway underground combined sewer outflow outflow out poor storm storm drain drain rain ninja turtles city city worker dark drip cold dingy infrastructure week public works public department environmental safety environment climate climate change watershed