HOUSTON, Texas (KTRK) -- The test results from the water main break came back clean and the boil water order has been lifted, according to Houston Mayor Sylvester Turner.
During the Houston Rodeo and Livestock Show parade, the mayor said he was excited to share the good test results.
Houston was placed under the notice after a major water main break Thursday that affected the water for about half of the city's residents.
Work on the water main break will continue into the weekend, with hopes to have water running through the line again by Tuesday.
Turner said despite the continued boil water order, water pressure is fully restored throughout the city.
He expects all schools and businesses to be able to return to regular hours and operations by Monday.
Turner wrote in a tweet that the water was tested at 5 a.m. on Friday. The results took about 15 to 16 hours to come back.
Mayor Turner issued the advisory urging residents to boil water before use after a major water main break Thursday morning flooded the East 610 Loop and prevented many cars from passing through.
City officials said the water line that burst provides water to 40-50 percent of Houston residents.
MAP: City of Houston's boil water notice
By Friday evening, all exits at Clinton and East Loop were reopened. Clinton was open in both directions but reduced to one lane between the East Loop and Coast Guard.
Many schools were closed Friday.
ABC13 spoke with environmental toxicologist Dr. Noreen Khan-Mayberry, also known as "Houston's Tox-Doc" about questions the public might have about why boiling water is necessary, how to properly do it and when it is needed.
USEFUL TIPS IN A WATER EMERGENCY: