Cartridge Filtration

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Trihalomethanes (THMs) in Irish Drinking Water:

Over the past number of years there has been a greater focus on Trihalomethanes (THMs) in Irish drinking water. Trihalomethanes (THMs) may be formed as a result of adding chlorine to water containing high levels of organic material (e.g. vegetation). The concentration of THMs in drinking water varies according to the level of organic material in the water, the amount of chlorine required to treat the water and the temperature of the water that is being treated. The legal limit of total THMs in drinking water in Europe is 100 µg (microgrammes) per litre. Irish Water is developing a National THM plan in order to deal with this issue. Analysis has shown that our water exceeds EU limits at many locations throughout Ireland. The HSE states that the benefits of using chlorine to treat our drinking water are much greater than any possible health risk from THMs.

If present, THMs can be ingested (swallowed), inhaled (breathed in) or absorbed though the skin while showering or bathing. Swimming in a chlorinated pool is another way that people may be exposed to THMs.

THMs are classified as ‘possibly carcinogenic’ to humans. The effects of THMs following long term exposure are low and rare. Some studies suggest a link between long term exposure to THMs (i.e. many years) and cancer and reproductive effects but the evidence is not conclusive. 

Contact Halpin and Hayward for information on our Trihalomethanes Water Filter.