Looking at the universe of stocks we cover at Dividend Channel, on 5/15/13, Aqua America Inc ( WTR) will trade ex-dividend, for its quarterly dividend of $0.175, payable on 6/1/13. As a percentage of WTR's recent stock price of $31.91, this dividend works out to approximately 0.55%, so look for shares of Aqua America Inc to trade 0.55% lower — all else being equal — when WTR shares open for trading on 5/15/13.Below is a dividend history chart for WTR, showing historical dividends prior to the most recent $0.175 declared by Aqua America Inc: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from WTR is likely to continue, and whether the current estimated yield of 2.19% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of WTR shares, versus its 200 day moving average: Looking at the chart above, WTR's low point in its 52 week range is $21.86 per share, with $33.28 as the 52 week high point — that compares with a last trade of $31.85. According to the ETF Finder at ETF Channel, WTR makes up 4.29% of the Water Resources Portfolio ETF ( PHO) which is trading lower by about 0.4% on the day Monday. In Monday trading, Aqua America Inc shares are currently up about 0.2% on the day.