The city's mayor said test results had showed no contamination, and locals could resume using water for drinking, bathing and cooking.
The ban was issued on Wednesday over fears that a leak at an asphalt plant could have tainted the water supply.
Long queues formed at grocery stores as shoppers stocked up on bottled water.
About 85% of Corpus Christi, which has a population of about 320,000, was under the restrictions.
The chemical behind the scare was Indulin AA-86, an asphalt emulsifier which can burn human skin in its concentrated form.
The leak took place at an asphalt plant leased to Ergon Asphalt and Emulsions by oil refiner Valero.
Mayor Dan McQueen told a news conference that investigations into the 24-gallon (91-litre) spill of Indulin AA-86 had determined that the water was safe to use.
It was not clear if the public water supply was ever contaminated by the chemical.
Officials said that none of the 28 drinking water samples analysed by the Environmental Protection Agency (EPA) tested positive for the contaminant.
However, the EPA said there have been seven "unconfirmed" reports of symptoms possibly related to prohibited water use.
Mr McQueen said officials would seek possible damages from those responsible for the leak.
There has been some confusion over exactly when city officials were notified of the problems at the plant that prompted the water use ban.
Valero Energy Corp said in a statement on Saturday that it had alerted the city to "milky, sudsy water" at the plant on 7 December - a full week before the ban was announced.
Ergon said the issue arose when "soap solution" flowed back into a pipe through which the plant receives water.
It said the pipe is not directly connected to the city's water main, but that the two are interconnected.
Corpus Christi locals have been warned to use water conservatively to avoid overtaxing the system.
The EPA will continue collecting and testing water samples in the city over the coming days.

Cardiff singer Gwenno recently won the Welsh Music Prize 2015.
But those unaware of the artist before will now see her adorning the outside wall of Cardiff's famous venue Clwb Ifor Bach on Womanby Street.
The 34-year-old said she was " incredibly honoured" to see herself in the 12 x 38 metre mural.
"I remember Clwb when I was growing up, I probably went to see my first gig there, dragged along to a Welsh Language Society event with my mum," said Gwenno, whose full name is Gwenno Saunders.
"Clwb is a huge part of everyone's heritage from Wales, most bands have played here.
"I'm incredibly honoured that they thought my face was worth putting up there," added the singer, who recently became a mother to son, Nico.
Gwenno was first approached by designer Mark James about the mural, which he designed for the Get it right campaign.
The campaign aims to prevent piracy in music and television, by promoting the value of creativity in the UK and raising awareness of genuine online content services.
"Gwenno's album had just come out and was getting a lot of attention," Mr James said.
The sci-fi themed album Y Dydd Olaf, sung in both Welsh and Cornish, was inspired by Owain Owain's 1976 Welsh novel of the same name.
"The original idea was to be quite political and to make a statement," he said.
Mr James's design, one of Cardiff's largest street art projects, was sprayed painted onto the building by local street artists Rmer, Zadok and Karm, in under three days.
It will remain on the walls of Clwb Ifor Bach for the next six months.
Residents of Corpus Christi, Texas, have been told it is safe to drink tap water again, after a chemical leak sparked a four-day ban.
[NEXT_CONCEPT]
An award-winning musician says seeing a giant mural of herself on the side of a club she went to as a teenager is "very, very surreal".