As far as I know, unless there is any regional regs that need to be on a pool sign ... most rules are going to be what insurance and liability needs dictate. One apartment complex I did signs for only needed the normal "don't run around pool, children are to be accompanied by an adult, pool is closed from 9pm until 9am, and (complex name) is not liable for any damage or injuries." While another had about 20 rules that were mostly like a list of grievances or things that were annoying to deal with (mostly things like "no thongs" ... booo ... or "limit 2 guests per tenant")