In 2023, drinking water monitoring was carried out in supply zones (water supply systems) that supply 50 or more persons (92.3% of the population). Large, medium and some of small supply zones that supply more than 500 (87.7%) inhabitants, generally have adequate drinking water quality. The smallest supply zones that supply 50-500 inhabitants are the least regulated, in comparison to larger due to the fecal contamination, as some with karst water resources.

Slovenia reported one to two waterborne outbreaks per year during 2014–2024, except in 2015, 2017–2020 and 2023-2024, when no outbreaks were reported. Last outbreak was reported in 2022 in the Savinja region, caused by the norovirus genotype GII.6. During 2014–2024 between 3 and 405 cases were reported. Confirmed causative agents were Cryptosporidium parvum, Escherichia coli, rotavirus, norovirus, Bacillus cereus, Campylobacter jejuni, Salmonella Typhimurium and Francisella tularensis.

Among the statistical regions of Slovenia, the Osrednjeslovenska region has the highest ecological footprint per capita (5.8 gha), while the Goriška region has the lowest (4.79 gha). The largest share of the ecological footprint in all regions is represented by the carbon footprint, contributing approximately 60%. A significant portion is also attributed to forest products (around 20%) and agricultural land (around 10%). The region with the highest biocapacity per capita is Primorsko-notranjska (8.02 gha), while Osrednjeslovenska has the lowest (1.11 gha).

Annual growing season length is increasing almost everywhere in Europe, mostly in Eastern and Northern part. In Slovenia, the length of the annual growing season is increasing, especially since mid-1990s. According to projections, the duration of the annual growing season throughout Europe will increase in future.

Comparison of periods 1961–1990 and 1991–2020 on the chosen representative stations around Slovenia shows decrease of heating degree days by around 10 % and multiple increase of cooling degree days. With projected continuous temperature raise until the end of 21st century, those trends are expected to continue. Thus, in Slovenia, energy demand for cooling will increase in the warmer period of the year, while the energy demand for heating will decrease in colder period of the year. Same trend is projected for Europe in general.