Water protection areas cover 3532 km² or 17,4% of Slovenia’s land surface in 2021. This is a slight increase, compared to 2017, but the goal of protecting the areas of all water sources for public water supply with a regulation on national level, has not been reached yet.

In Slovenia, nutrient overloading is still the basic problem concerning lakes and reservoirs, and from 2006 to 2019, no improvement is observed. In the assessment period 2016–2019, only 4 out of 11 lake water bodies were determined to be in good or very good trophic status. Overloading of lakes with phosphorus is usually a result of inadequate wastewater drainage and intensive agriculture in the watershed area.

Groundwater is most polluted in aquifers with intergranular porosity in the northeastern part of Slovenia.

Projections show a reduction in SO2, NOx, NMVOC, NH3 and PM 2.5 emissions by 2030, mainly due to more strict legislation and implementing a number of sectoral policy measures. Reduction is inline with set targets for 2020 and 2030. For PM2.5, NMVOC and SO2 emissions in 2030 are only slightly lower than according to targets, so there is a possibility that targets will not be met. To avoid that, it is of great importance that trends are regularly monitored and if necessary additional measures are prepared.

According to data from the Ministry of Infrastructure, a total of 135 self-supply devices were connected in 2016, 720 in 2017, and another 1,302 in 2018. In 2016, 130 solar power plants and 5 hydroelectric power plants were connected with a total nominal power of just under 1.1 MW. In 2017, 718 solar power plants and 2 hydropower plants were connected, and the total nominal power of the connected units was slightly under 6.5 MW. In 2018 there were 1,299 solar power plants connected, 2 hydropower plants, and, for the first time, also 1 wind power plant.