Tests have shown that floodwaters in two Houston areas have been contaminated with bacteria and toxins, according to tests from The New York Times.

The news outlet reported that it is still not clear how far the toxic waters have spread, but there have been breaches at numerous waste treatment plants.

Water that flowed down streets and into buildings contained Escherichia coli, a measure of fecal contamination, at a level at least four times that considered safe — often even more.

The U.S. Environmental Protection Agency and the Texas Commission on Environmental Quality have expressed concern about toxic floodwaters, but have not made public the results of sampling they may have done.

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