bad
biological
conduit
contaminants
dirty
domestic wastewater
drain
drain pipe
duct
effluent
environment
flow
flowing
gutter
impact
industrial
industry
liquid
municipal wastewater
natural
nature
odor
old
pipe
plant
pollutant
polluter
pollution
rusty
savor
scent
sewage
sewage pipe
sewer
sewerage
snuff
storm water
stream
surface runoff
tainted
treat
treatment
tube
tubing
untethered
waste
waste water
wastewater
water