Austin Warns of Toxic Algae in Public Waterways

City urges caution as spring weather boosts algae growth in lakes and creeks.

Feb. 25, 2026 at 9:34am

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The City of Austin is warning residents to be extra careful around local waterways due to the presence of potentially toxic blue-green algae mats. Austin Watershed Protection staff have observed the algae in the city's lakes and creeks over the winter, and expect to see more buildup as spring weather conditions become more favorable for the algae.

Why it matters

Exposure to toxic blue-green algae can cause skin rashes, stomach or liver illness, and neurological effects in humans and animals. The city is proactively alerting the public to the issue to prevent health incidents as the weather warms up.

The details

The algae mats look like dark blobs floating on the water surface and can sometimes mix in with other types of algae. Residents should avoid contact with the algae and take precautions before entering any local waterways.

  • Over the winter, Austin Watershed Protection staff observed the algae in the city's lakes and creeks.
  • As spring approaches, the city expects to see more buildup of the algae in local waterways.

The players

City of Austin

The local government of Austin, Texas, which is warning residents about the presence of toxic blue-green algae in the city's public waterways.

Austin Watershed Protection

A department within the City of Austin that is responsible for monitoring the city's lakes and creeks, and has observed the toxic algae buildup.

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The takeaway

This public health warning highlights the importance for Austin residents to be vigilant about avoiding contact with potentially toxic algae in local waterways, especially as the weather warms up in the spring.