In 1997 Dow Corning invested in a biological water treatment process to remove organic compounds from their effluent which was discharged into the nearby Cadoxton River. The purity of this water is shown by its Biological Oxygen Demand (BOD). The lower the BOD, the more pure the water. The graph shows that levels of organic compounds are now so low that they are below the limit of detection.

In addition to the biological treatment, other water purification projects now mean that the site can reuse 20% of its waste water in the production process. This has significantly reduced the volume of water used and also the volume discharged as waste. The environment benefits and Dow Corning also show a significant saving on their water bill.