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Author Sneeringer, Stacy
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Standard Deviation ♦ Coastal State ♦ Water Quality ♦ Management Measure ♦ Surfaceand Ground-water Pollution ♦ Management Plan ♦ Financial Outlay ♦ Within-state Variation ♦ Non-regulated County ♦ Regulated County ♦ Differences-in-differences-in-trends Model ♦ Coastal Zone Reauthorization Amendment ♦ Clean Water Act ♦ Ten-year Decline ♦ Surface Water ♦ Non-point Source ♦ Substantial Decline ♦ Trend Change
Abstract The 1990 Coastal Zone Reauthorization Amendments (CZARA), a portion of the Clean Water Act, federally mandated coastal states to adopt management measures to regulate non-point source (NPS) pollution. Coastal states adopted management plans between 1997 and 2002, and regulated areas bordering coasts but not other areas of the state. Despite financial outlays, no work examines whether the legislation had any effect. The paper uses within-state variation in trends in counties over time to estimate the effects of regulation on water quality. This differences-in-differences-in-trends model nonparametrically controls for trends in water quality in regulated counties prior to regulation, factoring out trend changes occurring in non-regulated counties at the time of regulation. The results show substantial declines attributable to CZARA in both surfaceand ground-water pollution. The largest effects occur in phosphorus, which in ten years shows a decline of 0.42 of a standard deviation in groundwater and 0.93 of a standard deviation in surface water. Simazine, the herbicide found in Roundup, shows a ten-year decline of 0.19 of a standard deviation.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Date 2008-01-01