Are sampled streams representative of drinking-water supplies in the United States?
For perspective on the relevance of NAWQA findings to surface water used for drinking-water supplies, most (87 percent) of the Nation’s 1,679 public water supply intakes are in watersheds draining undeveloped (55 percent) and mixed (32 percent) land uses. Twelve percent of the Nation’s intakes withdraw water from streams that drain watersheds with predominantly agricultural land, with the remaining 1 percent in urban land use.
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