West Virginia legislators are weighing the pros and cons of ending the state registration requirement on about 29,000 storage tanks a used to hold the brine water and crude oil byproduct of hydraulic fracturing, according to the Associated Press.

Advocates of the change, including a dozen oil and gas producers and their trade associations, claim the tanks contain organic materials and don’t threaten drinking water systems.

On the other hand, environmentalists and others opposing the change argue the regulation only costs $20 to $40 in one-time fees and it also requires companies to post identification and the state’s emergency toll-free phone line incase of a leak or spill. They have also agreed that drilling wastewater contains drinking-water pollutants such as benzene, bromides and heavy metals.

Regardless of the outcome, companies would still have to post identifying information at their well pads and be required to report tank leaks or spills.

Learn more: U.S. News > West Virginia lawmakers weigh tank registration repeal