Figure 15		
"Trends in the Occurrence of MTBE in Drinking Water Derived from Ground Water in 6 Northeast States, 1993-2006"		

Title:	Concentrations (95th percentile) of MTBE in drinking water derived from ground water for select one-well public water systems in six Northeast States by year from 1993-2006.	
		
		
Description:	These are graphs of median concentrations (95th percentile) of MTBE for each of 4 one-well systems by year.	
		
		
		
Origin of data:	The data were obtained from the one-well set on MTBE in drinking water:  150.one.well.systems.selected.by.PA.rdb	
		
		
		
Manipulation of data set:	"Initially, data was made unique by PWSID and SampleYear retaining any quantified concentrations of MTBE.  Then 95th percentiles of concentration were computed for each of 4 one-well systems."	
		
		
		
Other:		
		
