If you notice brown water coming out of your tap, it could be due to corrosion and rust forming inside the pipes. Changes in water pressure can cause the rust to come loose and flow through the tap, or it may be due to sediment from the hot water system. The layer between the water and metal outer of your hot water system is important, and if it is compromised, the quality of your water may suffer. This issue could also be a sign that your hot water system is nearing the end of its lifespan.