shower filter

Most of us probably filter our drinking water, or drink bottled water nowadays, but did you know showering and/or bathing in your typical city water can also be very unhealthy?

Chlorinated swimming pools are even worse….read on.

“Cancer rates for people on chlorinated water systems is 96% higher than for those on non-chlorinated water systems…” U.S. Council on Environment Quality

If that’s not bad enough:

Chlorinated Water Exposure May Boost Cancer Risk

from the American Journal of Epidemiology, January 2007
Drinking, bathing or swimming in chlorinated water may increase the risk of bladder cancer, a new study shows.

The findings are the first to suggest that these chemicals can be harmful when they are inhaled or absorbed through the skin, as well as when they are ingested, Dr. Cristina M. Villanueva of the Municipal Institute of Medical Research in Barcelona, and colleagues note.

Chemicals, most commonly chlorine and its subspecies, used to disinfect water can produce by-products that have been tied to increased cancer risk, Villanueva and her team point out. In the past the ingestion pathway has been proven, but this study shows that the transdermal pathway for chlorine by-products is just as important on the topic. The most prevalent chlorination by-products, chemicals called trihalomethanes (THM), can be absorbed into the body through the skin (transdermal absorption) or by inhalation, they add.

To investigate lifetime THM exposure and bladder cancer risk, the researchers matched 1,219 men and women with bladder cancer to 1,271 control individuals who did not have the disease, surveying them about their exposure to chlorinated water via drinking water, swimming pools, showering and bathing. The researchers also analyzed the average water THM levels in the 123 municipalities included in the study.

People living in households with an average household water THM level of greater than 49 micrograms per litre had double the bladder cancer risk of those living in households where water THM concentration was below 8 micrograms per litre, the researchers found. Researchers noted from review of THM concentrations in municipal water that 50 micrograms per litre is common in industrialized societies.

Study participants who drank chlorinated water were at 35% greater risk of bladder cancer than those who didn’t, while use of swimming pools boosted bladder cancer risk by 57%. And those who took longer showers or baths and lived in municipalities with higher THM levels were also at increased cancer risk.

When THM is absorbed through the skin or lungs, the researchers noted, it may have a more powerful carcinogenic effect because it does not undergo detoxification via the liver.

“If confirmed elsewhere, this observation has significant public health implications in relation to preventing exposure to these water contaminants,” the researchers conclude.

So your bottled drinking water is clean (unless you drink from plastic bottles–more in a future post on that), but what are you showering/bathing in? Google “shower filter” & you will find many to choose from. They are fairly cheap ($30 & up).

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