Tests confirmed the amoeba was found at the Don Misenhimer Park splash pad, according to Tarrant County and City of Arlington officials.
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In a release, officials said they were notified on Sept. 5 that the child was hospitalized at Cook Children's Medical Center with primary amebic meningoencephalitis, a rare infection caused by the Naegleria fowleri amoeba.
The Tarrant County Public Health investigation initially determined two possible sources for the child's exposure to water containing the amoeba: the family's home in Tarrant County or the Don Misenhimer Park splash pad in Arlington, officials said.
City officials drew water samples from the splash pad and sent them to the CDC for further testing. Thirteen days later, on Sept. 24, the CDC confirmed the presence of the amoeba in the water samples and said the splash pad was likely the source of the child's exposure, according to officials.
Arlington officials said the splash pad was closed Sept. 5 after they were alerted to the child's illness and remains closed for the remainder of the year "out of an abundance of caution." All other public splash pads were also closed for the remainder of the year.
Officials said all city splash pads passed their annual inspection prior to the start of the summer season.
However, city officials said there were instances of employees not consistently recording or conducting water testing before the Don Misenhimer Park and the Beacon Recreation Center opened each day.
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That includes skipped readings on two of the three days the child visited the park.
There have been no other reports of illness, according to officials.
The CDC says Naegleria fowleri infections are rare, with just 34 reported in the U.S. from 2010 to 2019. People are infected when water containing the amoeba enters the body through the nose, usually when people go swimming or diving in lakes and rivers.
This case comes a year after 6-year-old Josiah Macintyre died after contracting a brain-eating amoeba while playing at a splash pad in Lake Jackson, Texas. Macintyre's parents sued the city of Lake Jackson and Brazosport Water Authority.
The Associated Press contributed to this report.
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