Stewart Brothers Drilling crews were at a depth of more than 1,800 feet as of Thursday morning as the company drills a test water well on Corrigan Avenue, just southeast of Brownwood City Limits.

“They have reached the Ellenberger Aquifer,” said Dennis Graham, member of the Brown County Water Improvement District 1 board. “The drilling has slowed a bit but that’s expected when you’re drilling through a hard formation.”

Graham said the board estimated the test well would reach the depth of 3,600 feet by September, but he believes if the drilling continues the way it has been going they will reach the desired depth by the end of August.

“We’re right on schedule with our timeline,” Graham said. “I’m very optimistic that we’re going to find water. The geologist has been testing soil samples on a daily basis.”

Drilling will go on 24 hours a day, seven days a week, until the well is at a depth of about 3,600 feet, water district board members have been told. The pace of the drilling is about about one foot per hour.

According to Graham, the crews have been casing the well as they drill according to state regulations to help protect the well from collapsing.

Lake Brownwood’s elevation late Thursday was 1,416.64 feet, which is 7.76 feet below spillway. The lake has risen 5.36 feet since July 13.