U.N. report : Polluted water kills about 2.2 people a year ; wars claim fewer victims per year . Report also says wastewater could become a problem if treated . `` Financing and investment are urgently needed and must address design , ecosystem restoration construction , operation and maintenance of wastewater infrastructure , '' the report says . Upfront investment to build treatment plants would be expensive , report says .
U.N. report : Polluted water kills about 2.2 people a year ; wars claim fewer victims per year . Report also says wastewater could become a problem if treated . Upfront investment to build treatment plants would be expensive , report says .