Report ranks oil companies by water, chemical management practices

Released on Wednesday morning, the report reviewed the 30 of the largest publicly traded oil and gas gas companies in the United States and Canada.

Using public disclosures to evaluate 25 criteria, the report ranked the companies based on their management of water and chemicals in the horizontal drilling and hydraulic fracturing processes.

"Our report shows that smart use of water and chemicals continues to evolve, but more needs to be done," Boston Common Asset Management executive Steven Heim said in a statement. "Proactive companies adopt, develop, and disclose current best practices outlined in our report such as reducing freshwater use."