Ключевые слова: bacteria, building, channel, construction, contamination, danger, dig, dirt, dirty, drain, drainage, ecology, engineering, environment, environmental, equipment, excavation, flow, flowing, hole, home, house, industrial, industry, infrastructure, nature, outdoor, pipe, pipeline, plastic, plumber, pollution, pvc, renovation, sanitary, sewage, sewer, sewerage, smell, stream, system, tank, toxic, tube, tunnel, underground, waste, wastewater, water, work,