Where in my house should the water sample be collected? What if I have a water softener or other treatment unit installed?
A9: The water sample must be collected on untreated water. If the plumbing in the building has a water softener, water filter, or other treatment unit installed, the sample must be collected before the water goes through the unit. If there is no treatment unit installed, the water may be taken from any cold water, non-aerated tap in the building.
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