I received an e-mail the other day from a Flower Mound homeowner when the following story, “Methane plume found in Flower Mound,” appeared in the Dallas Morning News. His question was, “What does this do to home $ale$ in our area ??? I automatically replied that it should “fire them up!”
I think that the better question would be, “What will it do to property values?” The short answer is, “I have no idea.” But let’s explore that idea a bit.
A specially equipped van was “sniffing” the air around natural gas facilities in Flower mound in early March and discovered “methane gas plumes” near the intersection of Scenic Drive and FM1171 measuring 40 parts per million (40 ppm). The Dallas Morning News ended the article with the ominous statement that, “State health officials are investigating a child leukemia cluster in Flower Mound.” You understand the implication.
Methane gas is the primary component of natural gas. When we think of natural gas, we automatically think of how it smells. But natural gas (and methane) has no smell. The smell you are thinking of is introduced into the gas ( it’s called Mercaptan) before it is shipped for our consumption.
I e-mailed the Texas Commission on Environmental Quality (TCEQ) on Tuesday and asked them at what level did methane become dangerous. They said that they would get back to me on that. My cursory research did not indicate that Texas has established a maximum dangerous level but I’ll let you know what the e-mail said.
So I thought I’d approach this from another direction. At what levels are smoke and gas detectors set to go off? My research showed this. Methane has what is called a lower explosive limit (LEL) and an upper explosive limit (UEL). Between these two limits, light a match, and poof, St. Peter’s got your life on the big screen. The LEL is 50,000 ppm. Most smoke and gas detectors go off at about 20% of the LEL or 12,500 ppm. Many people can smell natural gas (with the added Mercaptan) at 10,000 ppm.
The van equipment would only register up to 40 ppm so we don’t actually know how high the ppm was or is for Flower Mound. As for the relationship of methane gas to leukemia, my cursory Internet research did not show a direct correlation. I’m not saying that there isn’t, but I did not find any web sites that would state that directly. I’d welcome any comments if someone knows more about this relationship.
So back to my original question. My opinion would be that, at this point in time, 40 ppm is not going to cause a run on Flower Mound homes and therefore not affect the value. If in time, this turns out to be a more dangerous situation, then there is a possibility that values would be affected. (How’s that for a fence-riding answer?) The effect on values may be similar to homes that are next to high voltage power lines—some buyers will take it into consideration and others don’t care. We will have to watch this situation and see how it smolders.