Topeka ? A chemical plant in Neodesha that was the site of a dangerous explosion Wednesday had a history of violating federal environmental rules and paid a $10,000 fine in 2009 for using a banned substance in one of its products.

But a check of records from other federal agencies shows that Airosol Company Inc., which owns and operates the plant, had a clean record with the Occupational Safety and Health Administration, which inspected the facility twice in the last five years and found no workplace safety violations.

State and federal officials said Friday they are still investigating the cause of Wednesday’s blast and its potential environmental impact.

The explosion forced a number of local water suppliers in Coffeyville, Independence and Neodesha to temporarily shut off water intake from the Fall River and Verdigris River because of contamination that resulted from the blast.

Kansas Department of Health and Environment spokesman Ashton Rucker said officials have identified some number of chemicals that were released into a nearby drainage ditch when firefighters responding to the blast sprayed water to put out the fire.

But he said he was not immediately able to verify what those chemicals were, and he said officials were still conducting tests to identify additional chemicals that may have been released.

Airosol makes a number of aerosol products for a variety of industries, state officials have said.

According to the company’s website, one of the products it makes is a household bug spray called Black Knight, which is used to kill ants and roaches.

In 2002, the owners of a rival chemical company, Pro Products, filed a citizen lawsuit against Airosol for violations of the Clean Air Act because it continued to use ozone-depleting chemicals known a chlorofluorocarbons, or CFCs, as a propellant in its aerosol cans six years after they had been banned by the EPA.

According to federal court records, that case was eventually settled in 2009 when Airosol was ordered to pay a $10,000 fine, plus $141,853 for Pro Products’ attorney fees.

Airosol also manufactures refrigerants, including R-134, which is used in automobile air-conditioning systems. It also makes janitorial and industrial products, as well as “private label” products for other companies.

Rucker said that KDHE officials and the Kansas Department of Wildlife, Parks and Tourism have been monitoring the area for other potential environmental impacts. But so far, he said, there had not been any widespread fish kills or other obvious threats to wildlife and habitat.

Steve Larson, a spokesman for the Kansas Department of Emergency Management, said that as of Friday afternoon, water customers in Independence and the nearby town of Sycamore were given an all-clear notice that they could resume using their public water. And he said the warnings for Neodesha and Coffeyville had been downgraded to a “boil-water” advisory.

In Neodesha, he said, the public water intake had been switched to a nearby pond, and filtered water from Elk Lake was being used to replenish the pond.