Updated July 9 at 5 p.m.

Pflugerville officials have lifted the boil water notice for those with groundwater wells near the sewage overflow into Gilleland Creek from the city's wastewater treatment facility.

Tests show the creek's dissolved oxygen levels, which can indicate contamination, have returned to normal. City officials originally estimated 1 million gallons spilled from the facility, though much less affected the area, according to a news statement.

"It appears a majority of the spill was contained within a dry pond on city property adjacent to the overflow manhole," Pflugerville Assistant City Manager Tom Word said in a statement.

A power surge at the Pflugerville Wastewater Treatment Facility early on July 7 set off a sequence of electrical failures that led to the spill, city officials said.

The city is taking steps to prevent any future power surges and expects to receive a complete incident report from the Texas Commission on Environmental Quality within 60 days.

Updated July 7 at 1:05 p.m.

About 1 million gallons of sewage spilled from Pflugerville's wastewater treatment plant in the early morning of July 6 into Gilleland Creek because of a power outage, according to a city news release.

City officials are advising residents within half a mile of the spill site and those 1 mile downstream or within any potentially affected area to use distilled, bottled or boiled water until further notice for personal uses such as bathing, drinking, cooking and brushing teeth.

Pflugerville's wastewater treatment plant sits on Gilleland Creek on the southeastern side of town near the intersection of SH 130 and E. Pecan Street.

Water should be boiled for at least one minute, the release stated.

The boil order does not apply to other parts of the city.

Those with private groundwater wells in the area should contact the city of Pflugerville at 512-990-6400 for testing, the release stated.

The city of Pflugerville is working with the Texas Commission on Environmental Quality and Texas Parks and Wildlife to clean up the spill, according to the news release.

Actions to take for those in the affected area:

• Persons who purchase water from a public water utility may contact their water supplier to determine if the water is safe.
• The public should avoid contact with waste material, soil and water in the area.
• If anyone comes into contact with the waste material or affected water, they should bathe and wash their clothing as soon as possible.