Figure 7		
"Trends in the Occurrence of MTBE in Drinking Water Derived from Ground Water in 6 Northeast States, 1993-2006"		

Title:	Proportion of data on methyl tert-butyl ether in drinking water dervied from groud water from each of six Northeast States in each year from 1993-2006.	
		
		
Description:	This is a graph of the proportion of all data on MTBE in drinking water from public water systems that was contributed from each systems in each State for each year of the period of record.	
		
		
		
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:	The number of systems with MTBE data from each State and in each year were summed and the proportion of the total data in ech year and by each State was computed.	
		
		
		
Other:		
		
		
		
