The expanded national monitoring program for farmed escaped salmon, that was established for the Norwegian Directorate of Fisheries in 2014, under instruction from the Norwegian Ministry of Trade and Fisheries, has estimated the frequency of farmed escapees in 205 rivers in 2018. The rivers monitored were selected on a set of criteria including: geographic coverage, inclusion of National Salmon rivers, inclusion of rivers of different sizes, and inclusion of rivers with existing data series and a good local network. Data has been acquired from summer angling, autumn surveys, broodstock sampling, and autumn diving surveys (also known as spawning surveys). The three first methods are primarily based upon angling with rod and line and differentiate between wild and farmed salmon by reading fish scales that also provide a picture of the individual fish’s growth pattern. Autumn diving surveys involve visual identification of farmed and wild salmon in the river based upon their external morphology and overall behaviour. In most of the rivers surveyed, more than one survey method was applied. All of the data collected in this program have been through a quality assurance process and scored in relation to a set of criteria for evaluating the data’s representativeness. The frequency of farmed escaped salmon in each river is presented as a percent for each of the methods, as well as a “year percent” which is computed from the percent farmed escaped salmon observed in the summer angling surveys and/or the autumn surveys based upon angling. The “year percent” takes into consideration the fact that summer angling surveys probably underestimate and that the autumn surveys based upon angling probably overestimate the true frequency of farmed escaped salmon in the river. The “year percent” has been estimated in 123 rivers, while the estimates from diving surveys are presented from 122 rivers. The results from all 205 rivers, including those where autumn diving surveys were the only method used, are presented in a simplified form that gives a total evaluation of each river. The overall estimate of farmed escapees in the river was classified as either below 4%, between 4 and 10%, or above 10%. Overall, 153 rivers displayed a low frequency of farmed escaped salmon (< 4%), 33 rivers had moderate frequency of escaped farmed salmon (between 4 and 10%) and 19 rivers displayed a high frequency of farmed escaped salmon (> 10%). These numbers represent a slight increase in the number of rivers where the estimated number of escapees has exceeded 10% in relation to 2017, where 15 of the rivers belonged to this category. The frequency of farmed escaped salmon varied among regions. For example, the Hardangerfjord region in Western Norway had the highest number of rivers with a high frequency of farmed escapees. In contrast, many rivers had low estimates of escapees in the area from Akershus to north Rogaland in Southern Norway. The unweighted mean frequency of farmed escapees in the summer angling and autumn surveys based upon angling were 2.8 and 4.1%, respectively, (and medians of 1.0 and 0.2%), and a mean “year percent” of 4.2% (median 1.3%). Based upon the diving surveys, the unweighted mean and median estimates were 2.7 and 1.0%, respectively. The average values from both the summer angling surveys, and especially the autumn surveys, have shown a decline in recent years. However, the values in 2018 are on the same level as the previous year. Different sources of potential statistical noise in the datasets are discussed in the report. The different survey methods that have been applied have their respective strengths and weaknesses, both in relation to sample size and reliable differentiation between farmed and wild salmon. That the frequency of farmed escaped salmon changes in the course of a season, and that escapees may display different behaviour in the river compared to wild salmon, are important sources of noise in the datasets. This makes it necessary to use information from several survey methods. However, by using the same methods in the same rivers over multiple years, it is possible to give a good indication of the temporal trends in the frequency of farmed escapees. The large volume of data collected and systematized in the program gives considerable optimism that the program’s continued development will provide a better understanding of each methods strengths and weaknesses in order to increase the quality of the monitoring program in the future. The report is divided into two sections. This main report, which summarises the results, and a detailed set of PDF files showing all raw data for all of the rivers included in the survey – available at www.hi.no.