Volunteer

Water Quality Monitoring

The San Marcos River Rangers are Texas Stream Team trained volunteers who act as community scientists to conduct monthly scientific data collection and observations at 30+ sites along the San Marcos and Blanco rivers.

As the oldest and one of the largest monitoring groups in the State of Texas, the River Rangers have collected and tested water quality samples along the San Marcos and Blanco rivers for 28+ years, monitoring the health of the river while alerting city and county officials to potential problems. Over 50 monitors go out monthly to collect samples and further our understanding of the river’s cycles.

SMRF works with numerous groups and has provided local teachers with training and support to start their own water quality testing programs for middle and high school students. The River Rangers train hundreds of monitors every year from across the state to become state-certified water quality monitors, accounting for more than a third of all monitors in the state since our inception and almost two-thirds of all new monitors trained within 2022.

We offer free, monthly Texas Stream Team training sessions for all folks who would like to become certified in the different curriculum options. These training sessions are first-come-first-served, and to participate, you must secure an RSVP prior to the date of the training; minimum age of 14 years old is required, and no prior experience is necessary. All materials are provided free of cost.

For more information about becoming a River Ranger and joining a training, contact:

Adam Berglund, Trainer and Coordinator / RiverRangers@SanMarcosRiver.org

We will send out RSVP Confirmation emails about once per week.

Request to Sign-Up Below

How do I get involved?

2026 Training Schedule:

Standard Core

Riparian Evaluation

Advanced (pre-reqs required)

E. coli Bacteria (pre-reqs required)

Optical Brightener a.k.a. Tampling (pre-reqs required)

Texas Stream Team Curriculum

Our Volunteers in Action