Fresh sewage has a color and odor described as

• A. Brown color and rotten egg odor
• B. Clear color and no odor
• C. Gray green color with a fecal odor
• D. Black color and chemical odor

Answer: (C)

Fresh sewage typically shows a gray to gray-green tint and carries a strong fecal odor. The gray-green color comes from suspended solids and microbial content in untreated wastewater, while the odor reflects the organic matter and bacterial activity present. The rotten egg smell is more characteristic of hydrogen sulfide produced during anaerobic decay, which is not a feature of fresh sewage. Clear color with no odor would not fit sewage, and a black color with a chemical odor suggests contamination by chemicals or other waste rather than fresh sewage. So, gray-green color with a fecal odor best describes fresh sewage.