In March, the United States Environmental Protection Agency (EPA) ordered the company to replace a faulty test for a chemical that was detected in the water supply at a West Virginia refinery.
The company said the faulty test had been in use since 2012 and was not detected in testing conducted in April and May, but the EPA said it would require more testing.
In response, the EPA released a memo asking the company if it would replace the test and pay for it.
The EPA said the company would not do so, saying the cost of testing could be prohibitive.
In July, the agency ordered a company to pay $300 million to the family of a teenager who died after ingesting contaminated water at a water treatment plant in California.
The boy had taken a bath in a chlorine solution that contained the chemical carbaryl, which can cause cancer and death.
The water treatment facility, in Sacramento, Calif., is owned by Chevron, and the company was fined $2 million by the EPA for the contamination.
Chevron has since agreed to pay a $250 million fine and a $1.8 billion settlement to settle lawsuits by more than 600 people who claimed the company violated their civil rights and environmental laws.
A report released this month by the nonprofit group Food and Water Watch found that in 2016, 1,800 water samples from nine states were found to contain potentially harmful chemicals.
The group’s report found that a total of 1,853 samples were found in nine states.
The report found 1,500 of those samples were contaminated with the toxic chemical brominated flame retardants (BFRs).
The chemicals are used in refrigerators, air conditioners and to make paints.
Brominated Flame Retardants, also known as BFRs, are a toxic chemical used in some air conditioner units, and in some other products as a flame retardant.
The Environmental Protection Department announced in February that it was requiring a $30 million payment from Chevron to the families of two people killed in the Flint, Mich., water crisis.
In August, the company paid $1 million to a family of two who died in the Los Angeles fire department.