Steve Minutillo :: messy-78messy things

污 – Wu1 – Filth

污染 – Wu1 Ran3 – Filth Contaminate — Pollution

污水 – Wu1 Shui3 – Filth Water — Sewage

It’s not clear what’s going on with 汙 – Wu1. 中文.com says it’s a “variant of” 污. My dictionary just says “see 污“.