Could regulators have prevented the Texas fertilizer plant explosion?

Could regulators have prevented the Texas fertilizer plant explosion?

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 he blast killed at least 15 people, most of them firefighters and other first responders.

Have fertilizer plants ever exploded before?

Yes. A plant in Sergeant Bluff, Iowa, that manufactured ammonium nitrate fertilizer — the same explosive chemical stored in West — exploded on Dec. 13, 1994, killing four people and injuring 18.
But fertilizer plants are safer now, said Stephen Slater, the Iowa administrator of the Occupational Safety and Health Administration. “All kinds of technologies have had huge improvements,” he told the Des Moines Register. “And we haven’t had any bad experiences at the plants in the 20 years since [the accident]. I’m knocking on wood.” (Slater didn’t respond to our requests for comment.)

Who regulates these fertilizer plants?
At least seven different state and federal agencies can regulate Texas fertilizer plants like the one in West: OSHA, the Environmental Protection Agency, the Department of Homeland Security, the U.S. Pipeline and Hazardous Materials Safety Administration, the Texas Department of State Health Services, the Texas Commission on Environmental Quality and the Texas Feed and Fertilizer Control Service.
Some of the agencies don’t appear to have shared information before the blast.