In northern Austin, Texas
Out of the tap:
pH is 9.8 to 10.0
kH is 3 deg, or 50-75ppm depending on test
gH is about 5 deg, or around 100 depending on test
After 24hrs aeration in a trash can, pH drops to 8 +/- .05, kH and gH hold steady.
These numbers track with the City of Austin's water quality reports, which are available online. You might check your city's website to see if they post their reports, too.
I called the water department, to find out how the heck they had such a high pH with such soft water. Turns out they treat the liquid rock at the plant with calcium oxide to drop the hardness from its 200+ source level (lots of limestone around here). The lower hardness saves pipes.
For our lower-pH fish, I cut the pH (and kH) with muriatic acid, and bring the pH back up to 6.5-ish with tiny additions of baking soda. The kH is still negligible, but with our weekly 30% water changes the pH in the 55 gal only fluctuates about 0.07 between lights-out and lights-on. I'm going to try the Seachem Acid/Alkaline Buffer ratio-based system in the tank to see if I can at least add a bit of buffering to the water while keeping it at 6.5 or so (just to add suspenders to the belt).
Glen