Context: There are different models of how much of this contaminate are in drinking water. Surely it depends on exactly where a person lives what their actual water is like. So if you take some of the models and use the higher numbers, you have some numbers above the "level of concern."
Top answer
There are different models of how much of this contaminate is in drinking water.
— Anonymous
There are different models of how much of this contaminate is in drinking water.
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You are right, the writer probably meant "contaminant", and that would be much better, but some such verbs can be used as nouns, too, like "precipitate" and "duplicate".