What will Perc’s Legacy be for Drycleaners?

Taking a step back and looking at the history of drycleaning, I see a few major subdivisions of time:

1. The dangerous days when highly flammable petroleum solvents caused many fires.

2. The developing days when early generations of machines and chemical management practices caused much pollution.

3. The contemporary/future days when the industry has moved away from hazardous chemicals altogether and the environmental component of the industry has all but been eradicated.

From my perspective, we are currently in a transition period between the developing days and the contemporary/future days. Some folks are safely using their Perc machines still, as today’s process is much less prone to environmental releases than in the past. However, accidents still can happen. Envision a future day when all drycleaning solvents have become non-toxic and non-harmful to human health and the environment. Waste products will be easily and cheaply managed. Heck, maybe there won’t even be any waste products. I believe that most everyone would agree that this is the direction the fabric care industry is headed. When that day fully arrives, what will be the legacy of the developing days?

A legacy can be defined as a gift from the past. Perhaps not always a gift that we want, but a remnant of sorts, nonetheless. A history of hazardous chemical use will leave a legacy, and in the case of drycleaning it will be left by Perc. Drycleaners are not alone in this regard. Many industries have followed similar patterns over time as their processes, raw materials and products have evolved. During the Industrial Revolution, many manufacturing companies increased production rapidly with ever-increasing technological breakthroughs that allowed more products to be made at an even faster pace. Chemicals were used abundantly based on their effectiveness, with minimal knowledge of whether they were hazardous or not. Within this void of understanding, waste management practices were based on convenience and the impact to profitability. There was no existing regulation of these chemicals or wastes because it was not clear that it was needed. Once it did become clear, the extra efforts required impacted the business’ bottom line, and there was an immediate shift of mindset toward limiting the use of those chemicals in their operations. Public perception, too, contributed to this shift of mindset. This pattern can still be seen today (e.g. PFAS) as new industrial chemicals are created and put into production. I believe, however, that the fabriccare industry’s relationship with hazardous chemicals will phase out with a bit more time.

So, what will Perc’s legacy be? How will we be reminded of the developing days of drycleaning in the future? The most prominent remnants will be the contamination issues and the unquantifiable health issues. I’d like to look at these in reverse order. Starting with health issues. There is a surplus of scientific data showing that exposure to Perc is unhealthy. I called the health effects unquantifiable mostly to capture the fact that the most serious are not evident for real-time observation. The primary short-term (acute) symptoms of adverse health effects to Perc exposure are skin reactions from direct contact, and headaches, dizziness, or breathing issues from inhalation of fumes. Some people will have all of these symptoms, and some people won’t feel a single thing out of the ordinary. That makes these acute symptoms seem unreliable for a definitive ruling on the unhealthy nature of Perc.

What is reliable are the long-term study results related to the occurrence of cancer among those who have been exposed to Perc for a defined period. These results show that prolonged exposure to Perc via direct contact, ingestion, or inhalation routes increases an individual’s lifetime risk of getting cancer. That is quantifiable and scientifically derived. There becomes ambiguity and uncertainty around this fact for some due to the high number of other chemicals that people encounter on a daily basis, which also have been found to incrementally increase the chances of getting cancer. In my experience the doctor doesn’t say, “You have cancer because of exposure to Perc,” they only say, “You have cancer.” Because of this, the legacy of adverse health effects that Perc leaves us is presently difficult to comprehend. Perhaps that will change in the future as medicine advances.

The second, and definitely more tangible, legacy that Perc leaves behind is a great number of contaminated properties. Many have been, or are being, cleaned up to a satisfactory extent every day. However, there are just as many that have not been recognized yet as being impacted by Perc operations. As we’ve discussed before, there are a certain number of business and property related transactions that may reveal a contamination issue. Examples would be a Phase I Environmental Site Assessment during the buying or selling of a property, a loan refinancing, or the buying or selling of a business. If none of these are undertaken during the post-Perc life of a property, contamination issues may go unnoticed.

If not actively addressed during a cleanup action, Perc can remain in the ground indefinitely. It is referred to as a recalcitrant chemical compound because it does not significantly breakdown under typical, naturally occurring subsurface conditions. A recalcitrant person is willful, unruly and uncooperative. The same can certainly be said about Perc contamination. If left unidentified and unaddressed, properties that are impacted by Perc could be environmental problems well into the future. We frequently run across former industrial properties that have been abandoned and fallow for decades. They only come to light when property taxes cease to be paid; usually due to former owners passing away, or their businesses going bankrupt and being dissolved. When taxes stop being paid, municipal entities start paying attention and may take a series of actions designed to get the ownership transferred to a new owner or business that will return it to active life. Those actions typically involve a Phase I and Phase II and that’s when the Perc contamination gets found. Once Perc is identified in these scenarios, one of two things typically happens:

1. Public money is used to cleanup the property enough for reuse; or

2. The property continues to sit idle for a very long time because nobody wants to get involved in a contaminated deal.

During milestone events in any given industry that result in the loss of business for some operators, most recently the COVID-19 Pandemic, these already strapped business owners may choose to keep potential contamination issues undiscovered. This is understandable. I’ve seen a lot of conversations related to how the Pandemic will result in the tragic loss of many small businesses. What I have not seen is the related discussion regarding how the Pandemic could lead to a dramatic increase in the number of orphaned, contaminated commercial properties. If you focus on those that are historical drycleaner properties, you will see the legacy of Perc.

About Jeff Carnahan

Jeff Carnahan, LPG & President of EnviroForensics, is an industry leader in environmental issues. Contact him directly at (317) 614-0590 or jcarnahan@enviroforensics.com. Visit enviroforensics.com for more information.


Your May post asking “What will Perc’s Legacy be for Drycleaners?” is thoughtful and asks a good question. In your post, you mention three subdivisions of time, one of which is “The contemporary/future days when the industry has moved away from hazardous chemicals altogether and the environmental component of the industry has all but been eradicated.”

As one of the Co-Founders of GreenEarth Cleaning, perhaps I am not viewing the mention of “contemporary/future days” of that subdivision of time accurately. For you see, I would argue that the word “future” can be eliminated from that subdivision’s title.

We three dry cleaners formed GreenEarth in 1999 for the express purpose of providing a viable alternative to perc for all of the reasons you cited regarding the legacy of perc for our industry. Over the past 22 years, through scientific testing, it has been documented that GreenEarth “cleans with results similar to perc ” (as stated in an IFI Study in 2002), is “non-toxic to the environment and its biodiversity” (as stated in the Canadian Minister of the Environment Study in 2011), given its closed loop system and the ability to use natural filtration that can be disposed of as non-hazardous waste (as permitted by many municipalities including San Diego, CA county), and that the GreenEarth dry cleaning fluid is pure 100% siloxane D5 and is therefore not deemed to be a VOC in the U.S., not toxic in the EU, nor a cancer causing agent by any health agency in the world, we would argue that the “contemporary/future days of the industry” that you mention are already here. In fact, some 2,000 dry cleaners around the world are using the GreenEarth sustainable process in a way that is good for fabric, people, the planet and their bottom lines. Ron Benjamin, Managing Director, GreenEarth Cleaning

Thank you for your comment, Mr. Benjamin. Your points are very well taken. The reason I combined today (Contemporary) and tomorrow (Future) is that there are still some folks in the industry who aren’t fully Perc free. With the formation of Green Earth in 1999, I feel that the industry has actually been in this transitional era since that time.
Best Regards.
Jeff Carnahan

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