Sewage Blending Stirs Up Debate

  • Many environmentalists fear the practice of sewage blending would become more routine if a new EPA policy is enacted. (Photo by M. Vasquez)

Officials at the Environmental Protection Agency are considering a new policy for sewage treatment plants. Many environmentalists say if the policy is adopted, it will lead to increased water pollution and greater risk to public health. The Great Lakes Radio Consortium’s Mark Brush reports on the debate over sewage blending:

Transcript

Officials at the Environmental Protection Agency are considering a new policy for sewage treatment plants. Many environmentalists say if the policy is adopted, it will lead to increased water pollution and greater risk to public health. The Great Lakes Radio Consortium’s Mark Brush reports on the debate over sewage blending:


(sound of water in sewer)


Some sanitary sewers are tied in with storm sewers. So when there’s a big rainstorm, or when there’s a fast snowmelt, all that water can inundate some sewage treatment plants. To tackle this problem, some treatment plants have adopted a practice known as “blending.” The excess sewage is re-routed around the slower parts of the treatment plant. The dirty water is then mixed with the water that’s been cleaned. It’s sometimes given a shot of chlorine, and then released into creeks, rivers, and lakes.


Kurt Heise oversees the operation of a sewage treatment plant on the Detroit River. He says the practice of blending is necessary in order to keep the plant from being overwhelmed.


“When you have a wet weather event, an extreme wet weather event, if we were to allow all of that combined water in through the normal process the treatment process would be ruined.”


Sewage blending has been around for a long time. To plant operators, it’s a necessary step in handling large amounts of dirty water. But to some people, blending is not seen as a good option. They want the practice to stop.


Instead, they say, cities should invest in their systems to make sure they can fully treat all the water that comes to the plant. Kurt Heise says, if his plant were required to do this, it wouldn’t make sense economically.


“It would almost result in doubling the size of our plant and spending just untold amounts of dollars for an event only happens a few times a year.”


Sewage treatment plant operators say you have to weigh the costs and the benefits before spending hundreds of millions of dollars on expanding the treatment plants. The decision of whether or not to allow blending has been left up to state and local regulators. But recently, the U.S. Environmental Protection Agency has weighed in on the subject. And ever since they suggested new guidelines for allowing blending, environmentalists have been critical of their plan. Mike Shriberg is the Great Lakes advocate for the Public Interest Research Group. It’s an environmental consumer activist organization.


Shriberg says the draft blending policy, the way it’s written now, is too broad. And will allow the practice of blending to become routine.


“Our fear is that when you’ve got a treatment plant that uses blending, they’re never going to upgrade to full treatment sewage. And so if a treatment plant is allowed to blend they’re not going to go up to full treatment capacity they have no incentive to do that anymore. It’s sort of the cheap way out.”


Sewage treatment operators say blending is better than seeing the raw sewage overflow into waterways. And they say it’s better than spending large sums of money to fix a problem that only occurs a few times a year. But critics say the EPA doesn’t have a good handle on how often blending is used, and what kind of health risks are associated with the practice.


Some initial studies have been done on blended sewage and how it might affect public health. Joan Rose is a water microbiologist at Michigan State University. She’s written a report on the health risks associated with blended sewage.


“So what I found was that if people were actually swimming in the water and there was a discharge of a blended sewage upstream, that their risk of getting sick, actually getting sick with a virus or a parasite was about a hundred times greater – when there was a blended discharge as opposed to if the water was fully treated.”


Rose says some of these viruses, such as Hepatitis-A, are highly contagious. At this point, there are no good estimates on how many people get sick from blended sewage each year. It’s never been studied, so the impact of blending on public health is unclear. Ben Grumbles is the Assistant Administrator for water at the EPA. He says the EPA is considering the billions of dollars at stake in expanding the nation’s sewer treatment plants versus the risk to public health.


“What we’re trying to do is to clarify what’s legal and what isn’t legal and to recognize the economic realities that sewage teatment plants face across the country in terms of their infrastructure needs, but foremost and above all what leaves the facility has to meet Clean Water Act permit limits.”


But the Clean Water Act permit limits don’t measure all the viruses, bacteria, and parasites found in blended sewage. And so some environmentalists and scientists say meeting the limits doesn’t necessarily mean protecting public health. Grumbles says officials are still reviewing the tens of thousands of comments they received after releasing the draft blending policy.


He says he doesn’t know what the final rule will look like, or if they’ll issue a rule at all. One thing is likely, if the policy is finalized the way it’s written now, it’s expected that environmental groups will take the EPA to court.


For the Great Lakes Radio Consortium, I’m Mark Brush.

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Point: Agreements Will Help Protect Great Lakes

  • The proposed Annex 2001 agreement is the subject of lively debate as to whether it will help or hinder the conservation of the Great Lakes (Photo by Jeremy Lounds)

In 1998, an Ontario company wanted to sell Lake Superior water overseas. Their proposal raised fears that Great Lakes water could be diverted with little oversight. Now, officials from the eight states and two provinces in the region have come up with two proposed agreements that would regulate new water diversion requests. The proposed agreements are known as the Annex 2001 Implementing Agreements. Great Lakes Radio Consortium commentator Cameron Davis says the agreements are a good first step in protecting a cherished resource:

Transcript

In 1998 an Ontario company wanted to sell Lake Superior water overseas. Their
proposal raised fears that Great Lakes water could be diverted with little oversight.
Now, officials from the eight states and two provinces in the region have come up with
two proposed agreements that would regulate new water diversion requests. The proposed
agreements are known as the Annex 2001 Implementing Agreements. Great Lakes Radio Consortium
commentator Cameron Davis says the agreements are a good first step in protecting a cherished
resource:


When I was growing up, my family and I used to go to the beach every Sunday. As I stood
looking out over Lake Michigan, I was awed at how it seemed to go on forever. Today I know
better. The Great Lakes are a gift left from the glaciers thousands of years ago. That’s
because less than 1% of Great Lakes water is renewed every year from rainfall, snowmelt,
and groundwater recharge.


Two proposed agreements by the states and provinces would make diversions of Great Lakes water
to places outside of the Great Lakes a virtual impossibility.


The agreements look to be a vast improvement over current laws. First, federal law in the U.S.
allows a diversion only if every Great Lakes Governor approves. That seems like a tough standard
to meet, but in fact, it’s already allowed two diversions of Great Lakes water to take place. In
the 1990’s, diversions were approved to Pleasant Prairie in Wisconsin and another one to Akron,
Ohio. The water was used for municipal supplies.


Second, the proposed agreements are an improvement over the Boundary Waters Treaty – a pact
signed between the U.S. and Canada almost 100 years ago. The treaty doesn’t cover one very
important Great Lake: Lake Michigan. Because Lake Michigan is solely within the U.S. and not
shared with Canada, the treaty leaves the lake unprotected. This is a problem because Lake
Michigan is directly connected to Lake Huron. So water diverted out of Lake Michigan means
water diverted out of Lake Huron.


The agreements are a good first step, but they need to be stronger. For example, they require
regional approval for diversions of water that go outside of the basin of more than one million
gallons per day, but they don’t require regional approval for withdrawals of up to 5 million
gallons per day that stay in the Great Lakes. In addition, the draft agreements need to do a
better job at requiring water conservation before potential water withdrawals can be considered.


We have a choice. We can be against the agreements and keep the status quo or work to make
them even stronger. We need to work to protect our region’s water so that our kids can continue
to look out over the Great Lakes and see them for what they are: vast, magnificent, but fragile
natural treasures.


Host Tag: Cameron Davis is the executive director of the Lake Michigan Federation.

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