Figure 9	
"Trends in the Occurrence of MTBE in Drinking Water Derived from Ground Water in 6 Northeast States, 1993-2006"	

Title:	Number of public water systems with data on MTBE in drinking water by poulation-size served of public water system and by State


Description:	This is a graph of number of public water systems with data on MTBE in drinking water by the population-size served served by the system.
	
	
	
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 public water systems with MTBE data by State and by population-served size were summed.
	
	
	
Other:	
