[en] Monitoring of environment in Lithuania is regulated by Law on Environment Monitoring adopted in 1997. Permanent gamma monitoring is the milestone in the system for pre-warning of a radiation incident. There are several organizations in Lithuania implementing gamma monitoring. A network of automated gamma monitoring stations is maintained by United Centre of Research of the Ministry of Environment. In cooperation with Denmark and Sweden there was implemented 12 fully automated monitoring stations, four of them are located around Ignalina NPP. Monitoring of radioactivity in precipitation is carried out in five meteorological stations, aerosols monitoring is performed at two stations. There are four monitoring places in the Baltic Sea. Analysis of the water, deposits on the bottom, aquatic plants and fish is in progress there. As regards rivers and lakes monitoring of four lakes is in progress and monitoring of rivers waters is carried out in the rivers crossing boards of Lithuania