Several flood warnings and watches were issued across Central Texas on Sunday, including in the areas inundated by deadly flooding last week.

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.

A surge of deep tropical moisture returns to Texas this weekend. Here's where the risk of flash flooding is highest in the state this weekend.

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.

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.

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

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

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.

President Donald Trump was expected to arrive in Kerr County, Texas, Friday afternoon, one week after the area was struck by catastrophic flooding.