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Cypress Creek, which flows from its headwaters in the historic Katy Prairie of Waller County through the rapidly developing suburbs of northern Harris County where it drains into Lake Houston. Surface water quality assessments indicate elevated levels of fecal waste, depressed dissolved oxygen, and elevated levels of nitrogen and phosphorous compounds. The Cypress Creek Watershed Partnership developed a WPP that was approved by the United States Environmental Protection Agency in 2021 and is currently being implemented.