When I throw these germs in the water supply, BOTULISM will cause the downfall of your (town/city/skatepark, take your pick).
sink. ★★☆☆☆ 沈 (sink) + 没 (downfall) = 沈没 (sink.)
to reject or turn town ★☆☆☆☆
(waterleft)
+ 
(throw)
KANJIDAMAGE