‘Crapshoot’ — How Sewage Contaminates Our Food Supply

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September 02, 2017 | 139,285 views

Story at-a-glance

  • “Crapshoot: The Gamble with Our Wastes,” a documentary produced by the National Film Board of Canada, commands attention to sewage and how it is handled
  • Today’s sewage contains chemicals, heavy metals, hospital waste, industrial solvents and pharmaceuticals, all of which remain in the sludge produced by waste treatment plants; this sludge is often repurposed and added as fertilizer to soil used on farms, gardens and lawns
  • Like most people, you may give little thought to waste treatment and how the items you drop down the drain or flush in the toilet may be affecting the environment, food supply and public health

By Dr. Mercola

The documentary, "Crapshoot: The Gamble with Our Wastes," produced by the National Film Board of Canada in 2003, investigates an important aspect of human life you likely give little consideration: sewage.  Do you know what happens to the water and other items after you flush the toilet or run water down the drain?

If you've never stopped to consider what happens after you turn off the faucet or put down the lid, this one-hourlong film will edify you. It may surprise you to learn the many negative consequences resulting from our so-called "modern system" of waste management.

The True Face of Sewage

Sewers are used all over the world. Through its miles and miles of underground pipe, sewers collect everything you send down the drain or flush down your sink. While waste management may seem simple from your vantage point as a single user, it is much more complicated and complex than you may imagine.

If you've ever toured your local waste treatment plant, you have likely seen the mechanical filter called a bar screen that is used to remove large items such as baby wipes, condoms, diapers, feminine-hygiene items, hairballs, paper towels, plastic wrappers and the like.

Although it is somewhat inconvenient, at least these items can easily be seen, gathered up and disposed of as landfill waste. Of greater concern are the items contained in sewage that cannot be seen with the naked eye, as well as the mixing of all kinds of items. As narrator, the late Ruth DeGraves reminds us of the variety of the wastes that conspire to make sewage a kind of "toxic soup:"

"Down into the sewer they go: factory run-off, thousands of new synthetic chemicals, organic chemicals, pharmaceuticals, storm overflow, food wastes, human excrement, vomit, detergents, industrial solvents, petroleum products, paints, oils, abattoir wastes, cleansers, asbestos, radioactive materials, heavy metals and dental and hospital wastes, to name a few."

In case you are not familiar with the term "abattoir," it is the technical term used for slaughterhouse. As such, abattoir wastes include byproducts from livestock operations such as animal blood, fat, feces, stomach contents, trimmings and urine. Not only is sewage an ugly, stinking mess, it also is dangerous due to the intermixing of all those types of waste.

But, most of us seldom think about it. Boston-based Laura Orlando, civil engineer and waste-reform advocate, estimates that up to 75 percent of the U.S. is connected to sewers. As such, she believes Americans have become desensitized to the potential risks involved. In reality, most people both appreciate the sewer system and take it for granted.

As noted by Orlando, "When we think about a drain that carries whatever we dump into the pipe and takes it somewhere else, it helps us forget about all of the dangerous things that can be in that pipe."

Sewers: An Ancient Development of the Romans

According to DeGraves, the modern sewer system was a brainchild of the ancient Romans. She states: "The sewer was in its glory in ancient Rome. It was about a vision of being civilized, and to have sanitation meant to be civilized, dignified and ennobled. It was in classical Rome that the sewers were first built on a grand scale over 2,500 years ago."

So enthralled were they with their invention, the Romans paid homage to a sewer goddess named Cloacina. She was so loved that Roman ruler Titus Tatius, a contemporary of Romulus, erected a statue of Cloacina near the famed sewer Cloaca Maxima ("Greatest Drain").

This masterfully constructed sewer was established in the 6th  century and remains today. Like all sewers, notes DeGraves, the goal of the Cloaca Maxima centered around: "The collection and transport of wastes by the use of water. Quite simply, the idea has always been to use water to move our wastes downstream to where we are not."

Historian and writer Carlo Pavia suggests the ancient Cloaca Maxima will always reign supreme in both historic and modern-day Rome. This is, in part, due to a famous Latin phrase attached to it, which when translated means: "The Cloaca is the vessel, the bowel of the city, which purges everything." But, does the modern-day sewer really purge everything? Common sense, and the filmmakers, suggest otherwise.

Spewing Raw Sewage: Trouble in Our Global Waterways

It may surprise you to learn that not all sewage is treated. In cities around the globe, even in these modern times, raw sewage is still dumped into lakes, rivers and other waterways at sickening rates.

In India, raw sewage has been dumped continuously into the famed Ganges River since 1917. Once pristine waters now churn with chunks of animal and human excrement at inconceivable levels of toxicity. Here, pollution levels are estimated to be 340,000 times what is considered safe! Veer Bhadra Mishra, an engineer and Hindu priest who lives in Varanasi, India's holiest city, notes the river, while not globally polluted, has local stretches that are highly toxic. Says Mishra:

"When we move from Tulsi Ghat towards the end of [Varanasi], more and more sewers join the river and more and more sewage flows into the river. The cumulative effect of all the city's sewage flowing into the river is felt at the downstream point where the Yemuna meets the Ganges, [in the city of Allahabad]. At that confluence point, the river water is septic — practically no dissolved oxygen, brown-black water and methane bubbles you can see surfacing from the bottom."

About the Ganges, The Sydney Morning Herald, states:1

"Experts estimate that more than 3,000 million litres of untreated sewage from towns along the Ganges are pumped into the river every day. By the time it reaches Varanasi… it becomes a sewer, and the sixth most polluted river in the world. Scientists  … have found the river has a fecal coliform count of more than 1.5 million per 100 milliliters (ml) of water. Water regarded as safe for bathing should not contain more than 500 fecal coliform per 100 ml."

Similar to the Ganges, the harbor in St. John's, Newfoundland, Canada, was recipient of some 120 million liters (31.7-million gallons) of raw, untreated waste that was being pumped into it every day. The waste was so prominent, tourists frequently observed large flocks of seagulls scavenging for bits of floating human waste.

With such a large volume of input, local experts estimate at least 16 feet of excrement solids rest on the bottom of the harbor, effectively making it a gigantic toilet bowl. DeGraves estimates 80 percent of Canadian coastal communities dump their sewage raw. Said Bill Stoyles of the Atlantic Coastal Action Program, which focuses on environmental and sustainability issues related to watersheds and adjacent coastal areas:

"There's a huge mound 20 feet high — a mound of crap just below the outfall that just keeps coming out. The solids, of course, drop to the bottom and pile up there, and the other stuff drifts away … We've come so far, become so civilized, so how can we be … living in our own filth?"

Untold Types and Quantities of Toxic Chemicals Lurk in Sewage

Given the public's general lack of education about sewage and sewage treatment, you may not realize how many toxic chemicals are lurking therein. Since the 1950s, which marked the introduction of chemicals into mainstream America, "countless new and unpredictable ingredients are being added to the sewage recipe," DeGraves says. "The sewer has become a super highway for toxic wastes."

Indeed, the average city generates millions of gallons of wastewater daily, containing many unknown types and untold quantities of hazardous components. The goal of sewage treatment is to attempt to clean the wastewater and then release it back into lakes, rivers and oceans.

While it is called "reclaimed water," it's anybody's guess as to the effectiveness and safety of this practice. In the documentary, waste-reform advocate Abby Rockefeller expresses concern about what she calls "our radical disconnection between us and our waste." In her opinion, most of us minimize the consequences of mixing our wastes together in the sewer. She notes:

"The fact that the consequences of our actions are not immediately connectable and we don't see the trouble immediately, makes it extremely easy for people to go on with their behavior and not think about the effects. In fact, our entire culture — the educational system, the industrial system, the government system — all encourage people not to think about waste disposal."

Sludge Anyone?

As part of the sewage treatment process, liquid waste and solid waste are separated. Liquids go on to become "reclaimed water," while solids become known as "sludge." According to the film, sewage treatment plants produce millions of tons of sludge every year, which in North America, depending on its intended application, may be known as:

Biosolids
Black gold
Compost
Nutricake
Sewage compost
Solid waste

As noted by DeGraves, Canada has embraced the notion of repackaging its sludge as fertilizer for application to farm and garden soil:

"We have embraced the idea of co-composting, wherein two big-city waste dilemmas are seemingly solved by mixing municipal garbage and sewage sludge. These waste materials undergo a 'digestive process,' and are packaged as 'Nutriplus,' a compost promoted for home gardens and agricultural use. Nutrient ingredients are listed on this mixed-waste product, but not the toxins or heavy metals."

Orlando notes sludge was long considered to be a hazardous waste until "Part 503 rules recast it as a beneficial, nonhazardous substance." (Part 503 refers to the U.S. Environmental Protection Agency's laws and regulations pertaining to biosolids.) The reality is sewage treatment was never meant to clean or purify anything. Moreover, it should never have been suggested sewer treatment could or would result in byproducts that are chemical-free, beneficial and safe for use by human beings. She emphasizes:

"It never started out that way, nor is it possible to make it that way. We end up in a treatment process with a very dangerous material that, most unfortunately, we are now putting into life cycles and on our land."

While it is well-known that sludge contains an unknown and extensive array of chemical wastes, there is also intense pressure being felt by all kinds of entities to dispose of it. Within the industrialized world, it seems, the need to dispose of sludge and sewage waste is almost always prioritized above public health and safety.

Sludge Contaminates Soil and Threatens Human Health

According to Mother Jones,2 recycling sewage has become a big business, with trillions of gallons of the wastes Americans flush annually being processed into products that are spread on farms, gardens and lawns. They note:

"In theory, recycling 'poop' is the perfect solution to the one truly unavoidable byproduct of human civilization. Turning sewage into a potent, inexpensive fertilizer means cleaner rivers and oceans. But as sludge has spread across the country, so have concerns that it may cause as many environmental problems as it solves. In communities where sludge has been used, residents have reported ailments ranging from migraines to pneumonia, to mysterious deaths."

Sweden has been called out as one nation that has made a direct link between sewage sludge and public health. One of the big concerns highlighted by Gunnar Lindgren, a chemical engineer from Goteborg, Sweden, centers on the presence of metals, such as copper, found in sludge. According to Lindgren:

"[T]he levels of metals is increasing very rapidly. Authorities know they have to accept the presence of metals because they desperately want to get rid of the sludge … Copper is one metal that is now presenting us with severe problems. It has risen to a level where it is a poison for the soils, as well as the organisms in the soils."

What Mother's Milk Reveals About the Negative Effects of Sludge

The turning point for Sweden's handling of sludge reportedly stemmed from the discovery of flame retardants in it that were linked to Non-Hodgkin lymphoma. Of particular concern was the dramatic increase of flame retardants found in mother's milk. Says Swedish oncologist Lennart Hardell of Orebro Regional Hospital:

"The concentration of brominated flame retardants in mother's milk has been increasing. We have historical batches [of mother's milk] in Sweden from the early 1970s, and at that time there were really low concentrations. Now the curve is going straight up, and the concentration of these flame retardants in mother's milk is doubling every sixth year."

Lindgren underscores a common-sense reality that whatever we put into our bodies, our water supplies and our sewer systems eventually comes out in the sludge. He states, "If you have a poison somewhere in an industry, you will have the poison in the sludge. … Sludge is a collection basket of all bad things." Adds Swedish civil engineer Carl Lindstrom:

"If you say that broccoli is a healthy vegetable, the next question is: What is it grown [in]? Broccoli grown [in] one soil can be very good for you, but if the broccoli contains heavy metals, it can be very bad for you. To focus attention on what you eat, you have to go deeper into the question of what is actually in the food, and especially look at what is in the soil it was grown in."

Is Your Food Grown in Sludge?

Sadly, nearly half of all sludge is applied to farmland, even though no one knows exactly what may be in the thick, wet mud. To sweeten the interest, sludge is often touted as a soil conditioner and it is routinely offered to farmers at no charge. Various forms of wastes find their way onto productive farmland under the guise of sludge-based fertilizers, including paper and pulp sludges, raw-septic waste and sewage sludge. About this sickening practice, Orlando comments:

"It says a lot about our culture to think we would even take the gamble to ruin our productive agricultural soil by applying a material that we know causes great harm. If we have any doubts at all, why risk putting it on our soil?"

In the U.S., sewage sludge used for fertilizer may contain a cocktail of pharmaceutical drugs due to the fact that many Americans take medications. These drugs are excreted in your waste and find their way into sewage-treatment plants, which typically don't adequately remove such drugs. When the sludge is applied to farm or garden soil as fertilizer, the plants get exposed to the pharmaceuticals, sending them indiscriminately into the food supply.

After news about the potential dangers of sludge became public in Sweden and other countries in Europe, including Belgium and the Netherlands, authorities banned the spreading of sewage sludge on agricultural land. In the short term, Sweden turned to burying its sludge in the ground, focusing first on areas such as motorways that were perceived to be less-intrusive to human health.

Solar Aquatics: A Unique Approach to Waste Treatment

In Bear River, Nova Scotia, residents resorted to a totally different tactic. They addressed their sludge waste by installing a solar aquatics treatment system. In a bold move, they placed the end of the city's sewer pipe in the center of town. By doing so, it was hoped sewer waste would remain top of mind for the community.

While this setup has not necessarily resolved all of their sewer and sludge-related issues, it certainly has made residents think more consciously about what is happening to their water and waste. Said Mark Van Zeumeren, former senior engineer with Environmental Design and Management, the company responsible for designing and installing the Bear River system in 1995:

"In the past, it was never in people's mindset as to what happened to the water, what they were doing with it … Here, everyone's keen to come down and walk through the system … They identify with their sewage now … This is their sewage and they have to deal with it."

Solar aquatics is radically unique in that it employs plants and microbes to purify waste. Inside the greenhouse in the city of Weston, Massachusetts, 16 gravity-fed tanks brew sewage with the help of floating flora. Celery, cherry tomatoes, mint, primroses and water lilies, as well as a few fish and snails absorb contaminants. Phil Henderson, chief executive officer of Ecological Engineering Associates, which owns and operates the Weston greenhouse, shares a few of the advantages of solar aquatics:3

Change Is Needed: Steps You Can Take to More Responsibly Handle Waste

No matter what kind of sewage treatment methods we may use to clean up after ourselves, certain problems will undoubtedly remain unless we determine to change our ways. Unless we change, most assuredly the habitual, daily use of all sorts of chemicals, medications and other toxic substances in our homes, industries and institutions will continue to burden our sewers.

While the film ended without a clear "call to action," I would like to draw your attention to a few potential areas that may fuel your thinking about how you can become more engaged with, and responsible toward, waste and waste treatment. If each of us made just one small change, it would go a long way toward helping us to collectively "clean up our act." Some areas to consider include:

[+]Sources and References [-]Sources and References

  • 1 The Sydney Morning Herald August 6, 2014
  • 2 Mother Jones May/June 2009
  • 3 The Christian Science Monitor January 6, 2000