In the WEF article mentioned earlier there is an estimate that
a free chlorine residual of between 0.2 and 0.5 mg/L [[aka ppm)
would be sufficient to inactivate a coronavirus in wastewater.

This is QUITE low. Also, the tap water free chlorine residual right now
is 1.3 mg/L [[ppm). That should take out the coronavirus. However
there are plenty of pathogens that need quite a bit more chlorine
in order to be disinfected.

One reference recommended 1/3 cup of bleach in one gallon of
water for disinfection of coronavirus. [[overkill for coronavirus)
This is a nominal 1200 ppm solution. For general disinfecting
with bleach it is recommended to use 1/2 cup of bleach to a
gallon of water, which is a nominal 1800 ppm solution.

On the other hand parvovirus and ringworm are pretty durable.
For disinfecting those, various organizations recommend a 1 in 10
dilution of bleach. That is 1.6 cups of bleach in one gallon of water.
That is about 5700 ppm.