The department said that the type of chemical, anhydrous ammonia, played a role in calling for shelter after a leak was reported at a 99 Cents Only Store distribution warehouse on the 23600 block of Colonial Parkway on Saturday evening.
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Carol Gray of the nearby Memorial West subdivision, which was under the shelter order, said she first noticed the ammonia smell around 10:30 p.m. on Saturday.
"I returned home from being out to dinner with girlfriends, and I let my dog out, and I smelled it," Gray said.
"I came inside, then got sick."
ORIGINAL REPORT: Shelter in place lifted after crews contain chemical leak at Katy warehouse, officials say
Here's a timeline of everything that transpired after crews were called to the leak at 8:42 p.m. on Saturday night.
Crews were pulled from the building due to safety concerns, and air monitoring began after officials said they noticed the ammonia coming out of the building at about 1 a.m.
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The shelter-in-place was issued on Sunday at about 9 a.m. before being lifted at about 1 p.m.
WATCH: What is anhydrous ammonia? Experts explain
Experts explains what anhydrous ammonia is
The messaging of that order left a lot to be desired according to neighbors in the impacted radius.
"They could have put notices on our door or come knocking on the door," Jim Hernande said. "It's concerning."
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ABC13 asked Harris County Public Health about their messaging, but that answer wasn't included in their statement.
In the meantime, Dr. Stephen Harding of Baylor College of Medicine said this was an excellent opportunity for officials to work on protocols.
"Houston is a city with a ton of manufacturing. The real thing to take from this is we're not going to ban a gas like this, but at least we refreshed the processes for dealing with these scenarios," Harding said, who serves as director of the school's medical toxicology department.
The Harris County Fire Marshal's Office said their investigation into the leak is ongoing.
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