Figure 11			
"Trends in the Occurrence of MTBE in Drinking Water Derived from Ground Water in 6 Northeast States, 1993-2006"			

Title:	Concentrations (95th percentile) of methyl tert-butyl ether in drinking water derived from ground water for all public water systems in six Northeast States by year from 1993-2006.		
			
			
Description:	This is a graph of concentrations (95th percentile) of MTBE for systems in all States by year.		
			
			
			
Origin of data:	The data were obtained from the full data set on MTBE in drinking water:  frozen_data_set_for_both_original_and_new_reports.rdb		
			
			
			
Manipulation of data set:	"Initially, data was made unique by PWSID and SampleYear retaining any quantified concentrations of MTBE.  Then, 95th percentiles of concentrations were computed for all systems in all States by year."		
			
			
			
Other:			
			
			
			
