Under normal circumstances, it is abnormal for a cat to urinate only once a day. A normal cat will urinate 3 to 5 times a day. However, if the cat drinks less water that day, it may only urinate once. If a cat only urinates once a day for a long time, it may be caused by urinary tract diseases such as urethral stones and cystitis. You need to take the cat to a pet hospital for examination to confirm the cause and then treat it to avoid delaying the condition.