Location of Septic Sewer Systems in the Pacific Northwest

Septic systems are useful for removing and processing human waste. However, they have the potential of leaking or discharging waste into the nearby system and increasing potential contamination of nearby streams. Data represent potential locations of septic sewers in the Pacific Northwest based on extrapolation of 1990 Census tract block group level information.化粪池系统（septic system）可用于收集并处理人类排泄物。然而此类系统存在污水渗漏或直接排放至周边管网的风险，进而增加了周边溪流遭受污染的潜在可能性。本数据集通过对1990年人口普查街区组层级的信息进行外推，标注出了太平洋西北地区化粪池排污管道（septic sewers）的潜在分布点位。