Skip to Main Content
Nationwide assessment of nonpoint source threats to water qualityAuthor(s): Thomas C. Brown; Pamela Froemke
Source: BioScience. 62(2): 136-146.
Publication Series: Scientific Journal (JRNL)
PDF: View PDF (673.97 KB)
DescriptionWater quality is a continuing national concern, in part because the containment of pollution from nonpoint (diffuse) sources remains a challenge. We examine the spatial distribution of nonpoint-source threats to water quality. On the basis of comprehensive data sets for a series of watershed stressors, the relative risk of water-quality impairment was estimated for the over 15,000 fifth-level watersheds in the contiguous United States. A broad division emerged at about the 100th meridian, with eastern areas typically under higher stress than western areas, reflecting the generally higher housing, road, and agriculture densities and higher levels of atmospheric deposition in the eastern division. Recent trends in some stressors are encouraging, but the prospect of further substantial population growth indicates continued pressure on water quality, suggesting that renewed focus on controlling nonpoint-source pollution will be needed if the goals of the Clean Water Act are to be attained.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationBrown, Thomas C.; Froemke, Pamela. 2012. Nationwide assessment of nonpoint source threats to water quality. BioScience. 62(2): 136-146.
Keywordspollutants, environmental health, assessments
- An assessment of forest cover and impervious surface area on family forests in the New York City Watershed
- The role of experimental forests and ranges in the development of ecosystem science and biogeochemical cycling research
- The role of experimental forests and ranges in the development of ecosystem science and biogeochemical cycling research [Chapter 17]
XML: View XML