(Portland, OR)  --  The City of Portland will vote on how to treat its drinking water for a potentially deadly parasite.  The Bull Run water source tested positive for cryptosporidium several times this spring and now the city has to come up with a solution by August 11th.  Two options are currently being considered, one is to build an ultraviolet plant at a cost of 105-million dollars, and the other is to build a new treatment facility that could cost up to 500-million dollars.  The City council will vote on how to deal with the parasite on August 2nd.