(NEXSTAR) – The U.S. is seeing a late summer surge in COVID-19 cases, tracking from the Centers for Disease Control and Prevention shows.

The spike is particularly pronounced in one region of the country, which includes Arkansas, Louisiana, New Mexico, Oklahoma and Texas, where about 15% of COVID tests reported to the CDC are turning up positive.

But practically the entire Western country isn't far behind. A dozen more states west of the Mississippi reported test positivity rates about 10% last week.

In reality, the number of cases across the country is likely underreported as more people opt to test for the virus with at-home kits over lab tests.

Testing sewage and wastewater, albeit gross, can give us a better idea of how many people are sick with COVID in a certain area.

"Wastewate

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