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Summary chapter

Summary chapter for national stats

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2018

Slovenia has 61.3% of its generated load compliant to the Urban Waste Water Treatment Directive (91/271/EEC).

In 2018, Slovenia counted 158 agglomerations generating ≥2,000 p.e. each, of which:

  • 98 agglomerations, generating 896,607 p.e. of waste water, complied with the requirements of the Directive; and
  • 60 agglomerations, generating 565,616 p.e. of waste water, did not comply with the requirements of the Directive.

The waste water load generated in Slovenia in 2018 was reported to be 1,462,223 p.e.

In 2018, Slovenia had not yet reached the target for collecting and treating waste water to fully comply with the Directive.

  • 0.9 % of the waste water load must still be collected (approximately 12,700 p.e.); and
  • 25.7% of the collected waste water load must still undergo secondary treatment in line with the requirements of the Directive (approximately 346,600 p.e.),
  • 36.2% of the collected waste water load from agglomerations generating >10,000 p.e. and discharging into sensitive areas must still undergo more stringent treatment in line with the requirements of the Directive (approximately 314,800 p.e.).

7.5% of waste water load is addressed by means of individual or other appropriate systems (IAS) i.e. non-centralised sanitation systems (approximately 109,200 p.e.).

For the 158 agglomerations, there are 148 urban waste water treatment plants, with a total design capacity of 2,342,000 p.e., of which:

  • 39 plants are active but not connected to collecting system,
  • 42 plants equipped with technology only for primary and secondary treatment,
  • 67 plants equipped with technology for more stringent treatment than secondary.

For the 148 urban waste water treatment plants, there are 28 discharges without treatment with a total load of 17,760 p.e.

Based on the 2018 data, it seems that the load generated is lower than the design capacity.

Compliance rate by Article

Agglomeration Waste water load
Slovenia in 2018 Total
[No]
Comply
[No]
Comply
[%]
Total
[p.e.]
Comply
[p.e.]
Comply
[%]
Article 3 (collection) 158 128 81 % 1,462,223 1,332,411 91.1 %
Article 4 (secondary treatment) 158* 100 63.3 % 1,350,200** 871,590 64.6 %
Article 5 (more stringent treatment) 25* 22 88 % 870,764** 555,915 63.8 %

Notice : This table contains only agglomerations with expired deadlines.

*The total [No of agglomerations] includes only those agglomerations that must provide secondary treatment / or more stringent treatment than secondary before discharging waste water from their treatment plants.

**The total [p.e. waste water load] is the sum of the load of all of the agglomerations that must provide secondary treatment or more stringent treatment than secondary before discharging waste water from their treatment plants.

Data source for table: Register, summary of MS data

133 agglomerations were not taken into account in the calculation of the compliance rate for Article 5 because these agglomerations generate ≤10,000 p.e. each.

Distance to target

Waste water load
Slovenia in 2018 Target
[p.e.]
Distance to target
[p.e.]
Distance to target
[%]
Collection 1,462,223 12,673 0.9 %
Secondary treatment* 1,350,200 346,643 25.7 %
More stringent treatment** 870,764 314,849 36.2 %

*The target [p.e.] for secondary treatment represents the waste water load (collected and not collected) from all agglomerations that must be subject to secondary treatment, regardless of whether or not the agglomeration complies with Article 3.

** The target for more stringent treatment represents the waste water load (collected and not collected) from all agglomerations generating >10,000 p.e. and discharging into sensitive areas (regardless of whether or not the agglomeration complies with Article 3).

Data source for table: Register, summary of MS data

The expected annual investment costs per capita for installing and renewing waste water collecting systems and treatment plants is 8 EUR/inhabitant/year.

The investment needs for ensuring adequate urban waste water collection and treatment, i.e. compliance with the Directive, as estimated by the national authorities and included in their national plan, are at the level of EUR 393.84 million for the period 2020-2030. This covers works on treatment plants, with the forecasted investment cost of EUR 97.72 million (2020-2030) , and works on collecting systems and/or IAS, with a forecasted investment cost of EUR 296.12 million (2020-2030).However, as indicated in a recent OECD study, Slovenia would need to increase their investments further to reach and maintain compliance. The OECD projected that the financing needs by 2030 (total cumulative additional expenditures for sanitation) is EUR 1 billion.

For the reference year 2018, Slovenia reported the production of 37,888 tonnes of sludge. The sludge is mainly disposed for others (70 %) and incineration (28 %).

At 2 discharge points, treated waste water is reused for infiltration.

No information was reported on storm water overflows by Slovenia.