Thirteen of Texas' 41 Superfund are flooded and experiencing possible damage because of Harvey, federal environmental officials say.
At least seven of those sites are in the Houston area.
San Jacinto River Waste Pits, which contains toxins linked to birth defects and cancer in the soil, is among the Superfund sites that were completely flooded.
The assessments was made via aerial imagery -- raised concerns about the potential health risks of floodwaters carrying the highly toxic pollutants over a wider area.
Houston Mayor Sylvester Turner said he had asked the U.S. Environmental Protection Agency to come to Houston to address the matter.
He said he didn't know of wasn’t that Superfund sites were flooding before President Donald Trump visited the area or he would have told the president directly.
EPA officials told Fox News they have not been to the Houston sites yet.