Which type of waste contains human excrement and liquid waste?

• A. Gray Water
• B. Sanitary Waste
• C. Black Water
• D. Domestic Waste

Answer: (B)

In plumbing, waste streams are labeled by how contaminated they are. Black water is the wastewater that comes from toilets and contains human waste—feces and urine—along with any liquid waste that accompanies it. This makes it distinct from gray water, which comes from sinks, showers, tubs, and laundry and does not carry toilet waste. Because black water can carry pathogens, it’s collected and treated separately in sanitary sewer systems or septic systems. Domestic or sanitary waste is a broader, less precise term, but the specific category that unambiguously includes human excrement is black water.