The EU Risk Assessment on MTBE concluded that there was no need for additional risk reduction measures in addition to those in place for MTBE.
It however identified a need for specific measures to limit the risks in relation to the aesthetic quality of ground water (taste and odour). These proposals recommended, as part of the Risk Reduction Strategy, the application of the best available techniques for the construction and operation of petrol underground storage and distribution facilities at service stations, and that harmonised technical standards for the construction and operation of the storage tanks be developed at a European level by the European Committee for Standardisation (CEN). The EU standard for storage tank construction (EN 12285-1) was published in 2003 and requires them to be double walled with proactive leak detection.
Europe choses to focus on the standards for construction and operation of petrol underground storage and distribution facilities at service stations, including identifying local factors such as use of groundwater and soil migratory conditions. This is important as petrol, whether or not ethers are present in it, needs to be managed so as prevent contamination of groundwater.
Further reading: Fuel Ethers Risk Assessments