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Isotopes in groundwater contains the isotopic composition of oxygen and hydrogen in Finnish groundwater and precipitation. Majority of the dataset base on the isotope records of groundwater collected in the GTK’s “One thousand well” (1999) and “Monitoring of groundwater quality” (1995 - 2007) -projects. One time and monitoring type sampling data is also included. The monitoring data is given as an average of the sampling occasions including standard deviation and maximum and minimum values. The long-term monthly and annual weighted mean values for the isotopic composition of oxygen and hydrogen in the monthly cumulative precipitation are presented. The monthly amount of precipitation were used for the weighting the isotope values. On the basis of the Personal Data Act and Personal Data File Decree, the data is confidential information, which restricts the use, distribution and publishing of the data. The location of points has been generalized in Lähde-web map application.
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