Floodwaters be contaminated with debris as well as high levels of bacteria, chemicals, waste and other pollutants, which can cause prolonged health risks, experts say.

Slow-moving storms will bring a risk of flash flooding to Texas both Saturday and Sunday. Here's where the greatest risk will be.

Texas has identified more than $50 billion in flood control needs, but lawmakers have devoted just $1.4 billion to address them

The risk of the catastrophic flooding that struck Texas Hill Country as people slept on July 4 and left at least 120 dead was potentially underestimated by federal authorities, according to an ABC News analysis of Federal Emergency Management Agency data, satellite imagery and risk modeling.

The July Fourth flood moved so quickly in the middle of the night that it caught many off guard in a county that lacked a warning system.

Some regions in the mid-Atlantic are also facing risks of flooding. On Sunday, Tropical Storm Chantal flooded parts of North Carolina, where more than 10 inches of rain fell near the Chapel Hill area. The Haw River, near Bynum, North Carolina, crested to nearly 22 feet, the highest crest on record there, as a result of those heavy rains.

Kerr County failed to secure a warning system, even as local officials remained aware of the risks and as billions of dollars were available for similar projects.

There are questions over why oversight was eased at Mystic Camp as it expanded in a hazardous floodplain, the AP reported.

President Donald Trump spoke with Fox News host Will Cain about rescue efforts in Kerrville, Texas after catastrophic flash floods on "The Will Cain Show."