environmental
agriculture
artesian
bionomics
bright
clean
clear
danger
drain
drainage
drink
drinking
drought
ecology
effluent
engineering
environment
faucet
flow
flowing
fountain
fresh
green
gush
headspring
irrigation
leaking
liquid
melioration
natural
nature
pipe
pipeline
pipes
plant
pollution
pouring
protection
purity
rain
sewage
sewer
source
supply
toxic
transparent
tube
unhygienic
water
wellspring