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initial version
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If the waste water treatment pant only handled domestic waste water, it is unlikely you will have any problems with contaminants. Given it is 20 years since it was last used, pathogens should not be a problem at all. Some information on the surrounding community and likely users of the plant would be useful in this. Try and find from local authorities if they have any knowledge of what - if any - industrial users may have been connected to the plant. You could also try and find some of the people who operated the plant, as they would also have some idea. For the well, also there should hopefully be no problems, but for that, it would be worth having the water checked. Are you in a totally urban area or peri-urban area? If the latter, possibility of agrochemicals being in the ground water. If the former, any industry in the area which might affect this. Also usual checks for e-coli, ph, salinity etc. should be done. A public health lab will be able to do the latter. For potential chemical contaminants, might be a bit more difficult to find a lab that can test for these but if there is a risk of such contaminants, this should be done.
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No.2 Revision
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If the waste water treatment pant only handled domestic waste water, it is unlikely you will have any problems with contaminants. Given it is 20 years since it was last used, pathogens should not be a problem at all. Some information on the surrounding community and likely users of the plant would be useful in this. Try and find from local authorities if they have any knowledge of what - if any - industrial users may have been connected to the plant. You could also try and find some of the people who operated the plant, as they would also have some idea. For the well, also there should hopefully be no problems, but for that, it would be worth having the water checked. Are you in a totally urban area or peri-urban area? If the latter, possibility of agrochemicals being in the ground water. If the former, any industry in the area which might affect this. Also usual checks for e-coli, ph, salinity etc. should be done. A public health lab will be able to do the latter. For potential chemical contaminants, might be a bit more difficult to find a lab that can test for these but if there is a risk of such contaminants, this should be done.
Having read your more detailed response on the other site, if it was a former army barracks, I would have a high degree of confidence in that it would have been a well run and maintained site, so risk of ground pollution should be fairly low. As well, if it was a completely stand alone system, separated from the surrounding community, I would imagine a low risk of contaminants going into the system to begin with. I would still have the well water checked, at least for basic tests, although since you are in Hong Kong, you will have access to sophisticated labs, so possibly you could look into checking for any other potential contaminants in the water.
