CHARLESTON, W.Va. - West Virginia lawmakers are weighing whether to stop requiring state registration of nearly 27,000 brine water and crude oil storage tanks.

At a House hearing Monday, a dozen oil and gas producers say their tanks contain harmless organic materials far from water system intakes, unlike the massive 2014 spill from a chemical tank that shut down the Charleston area’s water supply for nine days. They say that they already comply with other similar regulations.

A dozen environmentalists and other advocates say the regulation costs only $20 to $40 in one-time fees and requires companies publicly post notices with emergency contact information. They say drilling wastewater contains drinking-water pollutants and leaks could also taint wells.