smwi-logoThe San Marcos Watershed Initiative is a multi-year research and information gathering process with the end goal to create and implement a community-based and state/federally accepted Watershed Protection Plan (WPP) for the Upper San Marcos River.

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Vision Statement

A healthy watershed that supports a clean, clear, and flowing San Marcos River for the future as it was in the past.

The Initiative

In 2010, the Upper San Marcos River was cited on Texas Commission on Environmental Quality’s 303(d) list of impaired waterways, for exceeding total dissolved solids (TDS) water quality standards. The River is currently in compliance with the Clean Water Act Standards, but several pollutants have been identified as a concern.

The San Marcos Watershed Initiative (SMWI) began in 2012 as a multi-year process of research and information gathering with the end goal of implementing a community approved and federally accepted Watershed Protection Plan for the Upper San Marcos River. Read more.


Watershed Protection Plan

The Watershed Protection Plan is currently being drafted. Sections are available for review and comment as they are completed. Please click here for completed sections and additional information


Upper San Marcos Watershed – to download a high resolution version of the above map, click here (2MB PDF).


Implementing the Plan

Although the Plan has not been formally accepted yet, partners in the watershed are eager to begin implementing critical components of the Plan. A request for funds to begin implementing the Plan was submitted in the late summer of 2016 and was accepted!  The Initiative’s partners are slated to receive over $179,000 in September of 2017 to install best management practices around the City of San Marcos, do watershed-wide education, provide technical support to the city and more. Click here for more information. (PDF)


Revised Critical Habitat Designation for Three Comal Springs Invertebrate Species (PDF)

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smwatershedinitiative.org | smwatershed@txstate.edu

meadows-vertical-txstate-blue-goldThe Meadows Center for Water and the Environment
Texas State University
601 University Drive
San Marcos, TX 78666

The preparation of this website was financed through grants from the U.S. Environmental Protection Agency through the Texas Commission on Environmental Quality