Which of the following is an acceptable source of potable water?
Boiler water
.
Private well water
.
Mop water
Untreated water

A water well is a hole that is dug or drilled for using the groundwater and the aim of the well is to collect rainwater.

Hence the option B is correct. That is private well water.

Learn more about the acceptable source of potable water.

link

An acceptable source of potable water is private well water.

Explanation:

A water well is usually a dug or drilled hole in the ground to be able to use groundwater. In addition, there are wells that aim to collect rainwater (rain well). They primarily serve to provide drinking water.  

If the groundwater is just below the earth's surface, which is usually the case in humid environments, the groundwater level is easily reached by fairly simple digging. The excavated pit is usually also enclosed by bricks, so that the excavated hole can remain narrow over the entire length of the pit and also does not collapse if the soil itself becomes more humid and therefore less solid.

see below  

explanation:

all of the above