More than 14 million people were affected, according to the Texas Commission on Environmental Quality.
According to Executive Director for the Texas Commission on Environmental Quality Toby Baker, nearly 13 million people of the state's 29 million residents were told to boil water before using it.
White House homeland security adviser Liz Sherwood-Randall said 1 million or more people are still experiencing power outages as a result of the storm that has engulfed Texas and other areas of the United States. "Blame will surely be assessed".
The storms also left more than 335,000 from Virginia to Louisiana without power and about 71,000 in OR were still enduring a weeklong outage following a massive ice and snow storm.
The Electric Reliability Council of Texas (ERCOT), a cooperative responsible for 90 per cent of the state's electricity, said in a statement that it had made "significant progress" in restoring electricity to homes.
Texas Governor Greg Abbott urged Texans to shut off their water.
In Texas, 7 million people - a quarter of the population of the nation's second-largest state - were under orders to boil tap water before drinking it because low water pressure could have allowed bacteria to seep into the system.
In many areas, water pressure dropped after lines froze and because people left faucets dripping to prevent pipes from icing, authorities said.
State officials told residents to use bottled water or boil tap water before drinking, cooking, brushing teeth, and washing hands. The Texas Restaurant Association was coordinating food donations to hospitals.
The latest developments on COVID-19 in Canada on February 17, 2021
But health officials say the virus poses risks to everyone, particularly senior citizens and those with health complications. There were no new deaths, leaving that total at 61, while the number of people hospitalized for COVID fell by one to 32.
"And ERCOT's annual winter assessment, which was created to ensure the state is prepared, that assessment assured the public of Texas that there would be enough power to meet peak demand this winter".
Kimberly Malloy was sheltering in San Antonio, Texas, with her boyfriend and two sons in a house that has not had water for several days. Boil-water advisories remain in effect for most of the state's major cities, including Austin, Arlington, Galveston, Houston, San Antonio and parts of Forth Worth.
"Like everyone, we figured it would get cold and maybe a little outage and that's it", Neuman said.
"The water came on for a slight moment I believe on Thursday".
The winter storm spawned at least four tornadoes, according to Atlanta-based weather.com, including one in North Carolina on Monday that killed at least three people and injured 10.
In Jackson, Mississippi, Mayor Chokwe Antar Lumumba said most of the city of about 150,000 was without water Thursday night.
"They're working like the devil to take care of their folks", Biden said of Texas officials.
Water is loaded into the trunk of a auto at a City of Houston water distribution site, February 19, 2021, in Houston.
Before the wintry weather moved from Texas, the city of Del Rio along the U.S. -Mexico border, got almost 10 inches (25.4 cm) of snow on Thursday, surpassing the city's one-day record for snowfall.