Those levels are fine as long as they don't fluctuate too much with the fish in the tank. Some tap water can change PH over time as it gasses out. How often do you do a water change?
You could also let a glass of tap water sit out for a day or two and test the PH a few times to see if it changes. My tap water PH is 8.4 but then it lowers after a few hours to about 7.4-7.6 and stays there.