Document And Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 23, 2019
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2019  
Document Transition Report false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity File Number 1-6659  
Entity Registrant Name AQUA AMERICA, INC.  
Entity Central Index Key 0000078128  
Current Fiscal Year End Date --12-31  
Entity Incorporation, State or Country Code PA  
Entity Tax Identification Number 23-1702594  
Entity Address, Address Line One 762 W. Lancaster Avenue  
Entity Address, City or Town Bryn Mawr  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19010 -3489  
City Area Code 610  
Local Phone Number 527-8000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   215,840,774
Common Class A [Member]    
Title of 12(b) Security Common stock, $0.50 par value  
Trading Symbol WTR  
Security Exchange Name NYSE  
Tangible Equity Units [Member]    
Title of 12(b) Security 6.00% Tangible Equity Units  
Trading Symbol WTRU  
Security Exchange Name NYSE