Document and Entity Information
3 Months Ended
Mar. 31, 2011
Apr. 27, 2011
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2011  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q1  
Entity Registrant Name AQUA AMERICA INC  
Entity Central Index Key 0000078128  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   138,217,191