Started recently. Flush the toilet, turn off the show, [rattle]. Really annoying.

I checked the outside PSI and it's ~80. Seems high. I checked a neighbor and it was the same. I want to say it's been ~60 in the past. They are starting to bring online a new street or two in the subdivision; wondering if they raised it for that.

Anyhow, any suggestions on how to get it to stop?

They make water hammer arrestors that can go right in line with a sink/toilet/water heater line (Example). It'd be a very cheap and easy thing to try. Should help with several fixtures in the area. Throw one on and see if it kicks it.

Lots of water hammer arrestors on Amazon. Cut mine down but didn't fully eliminate, I think my hot water circulation pump is a contributing issue. No expansion tank on water heater yet.

Turn all your valves to high if that does not work

Change out stems to the sinks

Also replace fluid master

Something has lost a seal and this happens at my apartments

1980 plumbing
New clothes washer valve SLAMS closed = our first water hammer episodes
Amazon screw-on arrestor @ washer inlet connection
Presto
Solved

4.6 stars rated (others may be better?)
Sioux Chief Chief-660-HB 660-HB Water Hammer Hose Arrestor, 3/4-Inch