Can I add some comments, as my company does AWWA (American Water Works Association) sterilization of water lines for schools, hospitals, nursing homes, etc.? Just trying to dispel some misconceptions....
1. The AWWA procedure calls for 100 ppm of chlorine for 3 hours. That equates to about 1 quart of Clorox per 100 gallons of water. Run to all fixtures, let sit 3 hours, then flush. We've done this procedure hundreds of times followed by multiple sampling for E. coli and have never once found a positive E. coli result.
That is pretty much the same procedure we used to use when we had a residential well with a submersible pump after the pump and pipe had been pulled for maintenance or replacement. Dump a gallon of bleach down the well, run each fixture until we could smell the bleach and then let it sit overnight. Flush each fixture the next day until the smell was gone or tolerable.
Anyone who has used water from a residential well for some time will smell chlorine when using treated city water but will soon get used to it and not notice the smell.