Conducting EMF surveys nationwide. Testing homes located close to pylons and substation for high EMF levels. Evaluating if the current or potential residents health may be at risk due to the high emf levels caused by the nearby substation or pylon. The two main reasons its important to get an EMF Survey done if you're near to either a pylon or substation are: Health Risks and Selling Purposes. A home near to a substation that has an EMF report stating its no reason for concern is more likely to get more offers than a home that does not have an EMF report.