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Geronimo and Alligator Creeks

Homeowner Maintenance of Septic Systems (6-hour program)

Wednesday, August 18, 2021 from 8:30am to 4pm

Guadalupe County Extension Office

Flyer | Agenda

  • The program is free.
  • This course will focus on aerobic systems and include the following topics: treatment processes, health and safety considerations, and system inspection and maintenance.
  • The course will also provide answers to the most frequently asked questions, including when to pump a tank and what can or cannot go down the drain.
  • At the end of the class, you will receive a certificate that will need to be provided to the Guadalupe County Environmental Health office, if you live in Guadalupe County and are planning to do your own maintenance.
  • Due to the anticipated full attendance, please be prepared to stay slightly later than 4:00p.m., in order to cover all the material and adequately answer everyone's questions.
  • We will break an hour for lunch, and lunch is on your own. We will provide light refreshments.
  • Seating is limited! To register, please contact Evgenia Spears at geronimo.alligator@ag.tamu.edu or (979) 845-2862.
Healthy Lawns Healthy Waters

Thursday, September 23, 2021 from 8:30am to 12:30pm

Seguin Outdoor Learning Center at the History Center

Check back for details

Texas Well Owner Network

Thursday, November 4, 2021

Guadalupe County Extension Office

Check back for details

Low Impact Development

Wednesday, December 1, 2021 from 8am to 12pm

Seguin Outdoor Learning Center

Check back for details


Geronimo Creek and its tributary Alligator Creek are located in Comal and Guadalupe Counties, and lie within the larger Guadalupe River Basin. The headwaters of Alligator Creek begin in southeastern Comal County, just above Interstate 35 near New Braunfels. Alligator Creek flows southeast towards Seguin until about midway in the watershed where it joins Geronimo Creek. The majority of the Alligator Creek watershed lies within the extra-territorial jurisdiction (ETJ) of New Braunfels, while the majority of the Geronimo Creek watershed is almost entirely within the ETJ of Seguin.

Water Quality

Geronimo Creek is monitored by the Guadalupe-Blanco River Authority (GBRA) as part of the Clean Rivers Program. Geronimo Creek is listed on the Texas 303(d) List with a concern for nitrate-nitrogen and an impairment of the contact recreation use, due to elevated E.coli bacteria concentrations.

Public Response to Impaired Water Quality

Starting in 2009, development of the Geronimo and Alligator Creeks Watershed Protection Plan (WPP) was initiated by local stakeholders with the primary goal being to restore and protect water quality and designated uses of the creeks through voluntary, non-regulatory water resource management. Shortly after development of the WPP was completed, it was accepted by EPA on September 13, 2012.

How You Can Be Involved

Public participation is critical throughout implementation, as ultimate success of any WPP depends on stewardship of the land and water resources by landowners, businesses, elected officials, and residents of the watershed. The Geronimo and Alligator Creeks WPP defines strategies and identifies opportunities for stakeholders across the watershed to work together and as individuals to implement voluntary practices and programs that will restore and protect water quality.

You can become an active member of the Partnership by participating in meetings, signing up for email updates, and becoming involved in implementation of the WPP, as well as telling others about this important project! Simply contact Dr. Evgenia Spears under the Contact Us tab.

Geronimo Creek Watershed & Land Use Map (Download as PDF)

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