🔍 Key Concepts

• 33 CFR Subchapter O – Pollution definitions section (look for the term “graywater”) • What types of drains are explicitly included in graywater (e.g., galley, shower, laundry) • What drains are specifically excluded from graywater (e.g., sewage/medical/cargo-related)

💭 Think About

• Which option clearly matches typical domestic wastewater that is not sewage (human body wastes)? • Which options are more likely to be treated as sewage or special waste with stricter handling rules under pollution regulations? • If a system must avoid contamination from human waste or hazardous substances, which drains would regulators keep OUT of the graywater category?

✅ Before You Answer

• Verify in 33 CFR Subchapter O that graywater includes drainage from certain household-type uses (kitchen/galley, showers, sinks, laundry). • Confirm that graywater does not include drainage from toilets or other systems that handle sewage or medical waste. • Check whether drainage from cargo areas is treated separately (e.g., as potential oily/chemical waste) and therefore excluded from the graywater definition.