We perform radon measurements on the property and in the building. We carry out work in Chomutov, Jirkov, Kadaň, Klášterec nad Ohří, Žatec, Louny, Podbořany, Most, Litvínov, Teplice, Bílina, Slaný and their surroundings. We also focus on HG assessments for wastewater treatment plants, wells and septic tanks and IG surveys for the foundation of the construction.