What compound is not considered a water pollutant for SWM?

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Multiple Choice

What compound is not considered a water pollutant for SWM?

Explanation:
The idea is that not everything present in water is treated as a pollutant—only substances that pose health or ecological risks and have regulatory standards. Lead, nitrate, and ammonia are classic water pollutants because they can cause serious health effects or environmental harm and are regulated with drinking-water limits. Methane, by contrast, is a dissolved gas that is not toxic at normal water concentrations and does not have a drinking-water contaminant standard in SWM; the main concern with methane is its flammability risk in enclosed spaces, not its toxicity as a pollutant. So methane is not considered a water pollutant for SWM.

The idea is that not everything present in water is treated as a pollutant—only substances that pose health or ecological risks and have regulatory standards. Lead, nitrate, and ammonia are classic water pollutants because they can cause serious health effects or environmental harm and are regulated with drinking-water limits. Methane, by contrast, is a dissolved gas that is not toxic at normal water concentrations and does not have a drinking-water contaminant standard in SWM; the main concern with methane is its flammability risk in enclosed spaces, not its toxicity as a pollutant. So methane is not considered a water pollutant for SWM.

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