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Best Answer: Well - the kidney is the organ that regulates the amount of water *leaving* your body. It is controlled by hormones from other parts of your body: the pituitary gland below the brain, the adrenal glands above the kidneys, the liver. Intake of water is done by drinking, and most of the water is absorbed in your large intestine. The state of being thirsty is hormonally controlled from the hypothalamus.
Rating Newest Oldest. Best Answer: The kidney regulates the reabsorption of water from the filtered blood and has the most significant effect on water balance. The kidney can adjust the water content of urine to alter the amount of water leaving the body. just now. Report Abuse. the kidneys. it is regulated mainly in the distal convoluted and collecting tubules under the influence of ADH. if no ADH is present, urine is large and volume and dilute. if ADH is present more water is conserved and it is much more concentrated.