A lot of cities have auxiliary input ports on their water systems. The ports are designed to allow putting additives in. Perhaps installed originally for reasons of additional water purification but could be used for nefarious purposes too. These are not publicized because of desire to not encourage terrorism. Added: also, they can be remote controlled. wtf. hmmm.

A lot of cities have auxiliary input ports on their water systems. The ports are designed to allow putting additives in. Perhaps installed originally for reasons of additional water purification but could be used for nefarious purposes too. These are not publicized because of desire to not encourage terrorism.