Tsaftattacen ruwan sha, lafiyar muhalli, da tsaftar jiki su na taka mahimmiyar rawa wajen samar da ingantacciyar lafiya da kuma kasancewa cikin koshin lafiya. Amma duk da haka a fadin duniya, mutane miliyan biyu ne suke rasa tsaftattacen ruwan sha a bisa alkaluman MDD.