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The Source
Monday-Thursday from noon-1 p.m. on KSTX
Hosted by David Martin Davies

The Source is a daily, one-hour call-in talk program that gives listeners in San Antonio the opportunity to call and connect with our in-studio guests and city-wide audience.

The Source seeks to give life, context and breadth to the events and issues affecting San Antonio by bringing newsmakers and experts to the public, and highlighting the people being affected by the news of the day.

The show is hosted by veteran journalist David Martin Davies.

Tune in to The Source for insightful discussion and analysis on topics that matter to residents of the Alamo City.

Contribute to the conversation:

  • Call or text during the live show at 833-877-8255.
  • Leave a voicemail at 210 615-8982 anytime. Submissions may be played on-air.
  • Email comments to thesource@tpr.org.
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Support for The Source comes from Texas Mutual Workers' Compensation Insurance.
Support for The Source comes from UT Health San Antonio.
Latest Episodes
  • Toppled trees and debris surround a sign offering directions to the Central Texas towns of Ingram and Leakey.
    After a disaster: Covering the long road to recovery
    Following the devastating flooding along the Upper Guadalupe basin, two journalists talk about coverage of natural disasters in their parts of the country—from major fires in California to landslides due to extreme weather in the North Carolina. We're joined by Erin Stone, Climate and Environment Reporter for California NPR and Flood and Disaster Reporter Laura Hackett from Blue Ridge Public Radio.
  • The San Antonio Food Bank headquarters.
    SA Food Bank and rising food insecurity in South Texas
    Food banks have already directly felt the impact of federal funding cuts, including the termination of pandemic-era programs that provided $1 billion annually to combat food insecurity. Anti-hunger advocates are particularly concerned about the cuts to SNAP, arguing that for every meal the San Antonio Food Bank distributes, SNAP provides nine. As a result, families will be forced to ration food or lose benefits entirely.
  • The science behind Coke switching to cane sugar
    In the United States, Coca-Cola is typically sweetened with high fructose corn syrup. However, Coca-Cola is introducing a new line of its namesake cola in the U.S. that will be sweetened with cane sugar. This new line is not replacing the existing high fructose corn syrup version but rather offered as an additional option. What does science tell us about the health risks of high fructose corn syrup?
  • Rep. Thomas Massie (R-Ky.) holds a copy of a bill he cosponsored with Rep. Ro Khanna (D-Calif.) to force the House to vote on the complete release of the government's files on Jeffrey Epstein as he speaks with reporters outside the U.S. Capitol July 21, 2025.
    The making of a scandal: Jeffrey Epstein, Donald Trump and Congress
    Jeffrey Epstein was a wealthy financier and convicted sex offender who operated a vast network of sexual abuse and trafficking of underage girls. He died in jail under suspicious circumstances. Controversy surrounding former President Donald Trump includes his past friendship and social ties with Epstein. Now the Republican-controlled Congress is blocking the release of records in the Epstein investigation.
  • People carry out the contents of a flooded home.
    The Texas homeowners insurance crisis
    Texas is experiencing a home insurance crisis. This has led to skyrocketing insurance premiums, making homeownership increasingly unaffordable for many Texans. This is due to increased frequency and severity of extreme weather events, rising costs of materials and labor, and the impact of inflation. Some insurers are leaving Texas leaving more homeowners exposed to risk.
  • Trump's 'Big Beautiful Bill' could mean bigger electric bills for Texans
    A report from the Texas Reliability Entity shows that the ERCOT grid is increasingly reliable. And that’s mostly because of solar and battery storage additions to the state’s energy portfolio. That directly contradicts President Trump’s Department of Energy. Also, at the summer heat comes back, ERCOT expects to approach record peak demand this week. And the state’s booming solar and storage will keep the power on—just as GOP politics takes aim at renewables.
  • VIA's conceptual rendering of the Green Line
    VIA focuses on improving service with frequency and growing ridership
    Via metropolitan transit is moving on the development of mass transportation. There are the Green and Silver advanced rapid transit lines. The Better Bus Plan looks to boost frequency on key routes. What is Transit Oriented Development (TOD)? What is the long-term vision for VIA?
  • Climate change and the Guadalupe River flash flood
    The July 4th flash flood that hit Kerr County and community along the upper Guadalupe River is one of the worst natural disasters to hit modern Texas. The sudden downpour of so much rain prompts the question—Did Climate Change play a role? Author and climate scientist Kate Marvel takes a look.
  • Send in the drones: A new era of warfare
    The nature of war has changed. Ukraine has developed new technologies and strategies in fighting off the invasion of Russia using low cost drones. They are making tanks and heavy artillery almost obsolete, while being able to launch pin-point attacks deep inside of Russia. How capable are drones? Is the United States learning how to use and defend against these new tech weapons?
  • The people deficit—What happens when depopulation becomes a crisis?
    Around the world many nations are facing a full-blown depopulation crisis. In the U.S. birth rates have steadily declined and the U.S. fertility rate is now well below replacement level. Some parts of the country are already experiencing population loss, aging demographics, and labor shortages. What needs to happen to change the population decline before it’s too late?