Water pressure has been restored in south Fulton County after repairs to a water main were completed Tuesday, and a boil-water advisory was lifted Thursday for all customers.

The advisory was lifted Wednesday night for everywhere except for the area between I-85 to the west, Burdett Road to the north, Old National Highway to the east and Jonesboro Road to the south, the Atlanta watershed department said. On Thursday, the department announced that testing was complete on samples for the remaining areas.

“Additional samples taken in this isolated area confirmed there was no contamination of the public water system,” officials said in a news release. “Water may be used for all purposes without boiling.”

At the height of the boil-water advisory, 100,000 customers were affected.

MORE: As water returns to south Fulton, frustration with response mounts

Residents and property owners in the cities of Chattahoochee Hills, South Fulton, Union City and Fairburn were impacted by the break, which sent water flooding into parking lots and businesses in the area of Fairburn and Cascade roads on Monday.

A broken water main sent muddy water flooding into this shopping center parking lot near Fariburn and Cascade roads on Monday. Several patrons were unable to reach their cars for hours.
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According to Fulton County Schools, two dozen schools were also impacted, including one elementary school that was left without water on Tuesday.

The school district said all 24 schools have adequate water pressure and were operating on a normal schedule Wednesday.

Repairs to the 30-inch transmission were completed by 5 p.m. Tuesday. Atlanta’s Department of Watershed Management, which delivers water to the south Fulton cities, had expected the line to be repaired hours earlier, but the five-foot stretch of line proved more difficult than anticipated to fix, The Atlanta Journal-Constitution previously reported.

RELATED: South Fulton water main break fixed, boil advisory continues Wednesday

Officials issued the advisory for all residents and property owners in Chattahoochee Hills, the City of South Fulton, Union City and Fairburn on Monday after the main burst.