accident
chemical
contamination
corrosion
danger
dirty
disaster
draff
drain
drainage
dump
ecology
environment
excrement
factory
faeces
fatal
feces
flow
garbage
gushing
impurity
industrial
industry
influence
liquid
mire
mud
nature
outdoor
pipe
pipeline
plant
pollution
refuse
reset
river
rusty
sewage
sewer
shit
stench
stream
substance
technology
toxic
tube
waste
wastewater
water