Initial results from an ongoing study have found Onion Creek is “hydrologically connected” to the Middle Trinity Aquifer, according to a memo to the Barton Springs Edwards Aquifer Conservation District (BSEACD).

Doug Wierman, an independent geoscientist working with the Meadows Center in San Marcos, said the results show an important connection that could have an impact on the area.

“It confirms that whatever is in the creek can get into the aquifer,” Wierman said.

The st...