Drilling well with river water: safe?

I'll be drilling a well in a location that is about a half mile from the nearest water line. It IS, however, next to a river so I'm planning on using a mud pump to pump river water for the drilling process. This well will, eventually, be providing water for an entire homestead, so it will need to be potable ... eventually.

If I use river water to drill the well, will I still be able to disinfect it with bleach or by pumping river water through it am I permanently ruining its potability?

Thank you for your help.

The reality is yes, you can do fine with river water and get the well disinfected afterwards. I drill with only potable water, but of about a dozen drillers within 75 miles, In only know 2 others that use clean water. Everyone else pulls the water truck over by a stream, pond, or river and gets a load with a trash pump. According to the regs, you can do it, if you properly chlorinate the water first, but no one does. Not sure what the regs are there, but it's probably frowned on. The only other thing to mention, is if it is salt water, most conventional drilling additives won't work....they have some really expensive stuff available, but normal high yield bentonite won't mix.