Nonsewered population in the United States Pacific Northwest for 2002

This spatial data set was created by the U.S. Geological Survey (USGS) to represent populations that did not have access to municipal sewer service in the Pacific Northwest region of the United States (Hydro Region 17; Major River Basin 7 (MRB7)) in 2002.

本空间数据集由美国地质调查局（U.S. Geological Survey, USGS）编制，用于表征2002年美国太平洋西北部地区（水文区域17；主要流域7（MRB7））内未接入市政排污管网服务的人口状况。