Yes — Texas rule TAC §265.192 requires an emergency telephone in the pool area or within 200 feet.
Texas requires an emergency telephone in the pool area, or within 200 feet of it.
Citation: TAC §265.192
The 200-foot allowance is helpful for larger apartment and HOA communities where the office or clubhouse sits a short distance from the pool gate.
SouthEast Telephone installs and monitors cellular emergency pool phones nationwide and can help you meet Texas's requirements.