本文对可能影响中西部地表饮用水供应的选定非点源（NPS）污染物进行了非技术性讨论，该地区的水源保护需要考虑地理因素和独特的土地利用。通过观察成功和失败的流域项目，很明显，长期水资源管理必须包括减少污染物的整体或系统方法。

This paper presents a non-technical discussion of selected nonpoint source (NPS) pollutants that may affect surface drinking water supplies in the Midwest, where there are geographic factors and unique land use that need to be considered in source water protection. By observing the watershed projects that succeed and those that fail, it is apparent that long-term water resource management has to include a holistic or systemic approach to pollutant reduction.