Ethanol is starting to bring prosperity to some rural communities. But there are also concerns about whether adding this new industry to other industries - and cities - that draw on groundwater supplies will cause local shortages of water. (Photo by Rebecca Williams)
It’s no surprise that the Corn Belt is the heart of the ethanol boom.
Two main ingredients you need to make ethanol are corn and water.
There’s no shortage of corn of course, and in most places it’s assumed
there’s also plenty of water. But as Rebecca Williams reports, even
people in water-rich states are getting concerned about ethanol’s
thirst for groundwater:
Transcript
It’s no surprise that the Corn Belt is the heart of the ethanol boom.
Two main ingredients you need to make ethanol are corn and water.
There’s no shortage of corn of course, and in most places it’s assumed
there’s also plenty of water. But as Rebecca Williams reports, even
people in water-rich states are getting concerned about ethanol’s
thirst for groundwater:
Bob Libra can tell a lot about water by looking at rocks. We’re in his
rock library – it even has a Dewey decimal system. Libra’s holding up
one of the 35,000 chunks of rock in here.
(Sound of scraping on limestone core)
“This for example is a core from a well. You can look at this and say well this is
what the plumbing system’s like down there.”
Libra’s a state geologist with the Iowa Department of Natural
Resources. Part of his job is to figure out how healthy his state’s
water supplies are. Any time a test well is drilled for a new ethanol
plant, rock samples get sent here.
Outside the rock library, there are three red pipes sticking up out of
the ground. These are observation wells that tap into sources of
groundwater far underground, called deep aquifers:
“A lot of people refer to it as Paleo-water or fossil water. It’s been
down there tens of thousands, hundreds of thousands, maybe millions of
years.”
Libra says the water in those deep aquifers is pumped out for
everything from drinking water to ethanol plants. But as it’s pumped
out, it’s not replaced right away. It could take hundreds or thousands
of years to replenish the aquifers.
Geologists use the observation wells and rock samples to figure out how
much water is in those aquifers. But here at the rock library, those
samples are piling up into small mountains in the storage room. Bob
Libra says his state is way behind. Iowa hasn’t updated its groundwater
maps for 20 years:
“I think Iowa’s in the same kind of situation that a lot of states that
tend not to think of themselves as ‘water poor’ are finding themselves.
We haven’t paid attention to it for 20 years and suddenly BANG we’re
using an awful lot. And we have people every day going I’m interested
in putting a plant here – how much water can I get over here? And it’s
happening very rapidly.”
Each state has its own way of managing its groundwater. In Iowa, you
have to have a permit if you’re withdrawing more than 25,000 gallons of
water per day from a well or stream. Libra says the ethanol boom has
overwhelmed the state office where permits are handed out for the
asking:
“I’m at this location, I’m drilling into this aquifer, I’m going
to extract this amount of water. Here’s my $25 for a 10-year permit.”
Libra says nobody’s really checking to see if all these water
withdrawals will work for the next few decades.
How much water ethanol plants consume depends on who you talk to. But
on average, it takes between three and four gallons of water to make
one gallon of ethanol. Bob Libra says here in Iowa, adding new ethanol
plants is like adding a bunch of new towns out in the cornfields:
“A lot of ethanol plants they’re building now are on the order of 100
million gallon per year capacity so they’d be using about 400 million
gallons of water a year which is roughly as much as a town of 10,000
people.”
In some drier states, new ethanol plants are running into opposition.
Mark Muller is with the Institute of Agriculture and Trade Policy. He
says groundwater is local. So, what works in one place might be a
crisis in another:
“We’ve already seen it in Southwest Minnesota where a plant was denied because
of a lack of water resources. There’s a couple big fights going on in
Kansas right now over water availability. I think this is going to
probably one of the big drivers that’s going to make the industry look
further East rather than in the Midwest/Great Plains.”
The ethanol industry argues that it has already cut back on water use.
Lucy Norton is the managing director of the Iowa Renewable Fuels
Association. She says it’s in the industry’s best interest to be
careful with water:
“We’re not going to see a plant built somewhere where it’s an iffy
situation as to whether 10 years from now we’re going to have enough
water. You don’t put $200 million investment into a location that’s
not going to be able to sustain itself 10 years from now.”
But even if the water supplies could last 50 years, once the water is
gone from the aquifers, it’s gone for a long time.
There are a lot of
test wells going in these days, with 123 plants in operation and more
than 80 under construction around the country.
The growing political pressure for more and more ethanol is making
state officials eager to figure out exactly what’s underground, instead
of just assuming there’s enough water.
For the Environment Report, I’m Rebecca Williams.
