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Surface water quality

Last update of indicator 13.12.2021

Indicator definition

The indicator describes the surface water quality in monitored sites.

Units

%, number

Metadata

Related policy documents and targets

Strategy of the environmental policy of the Slovak Republic - Greener Slovakia (2019)
 
Sustainable Use and Effective Protection of Natural Resources
 
Goals: A good condition and water potential of all water bodies through the restoration of river ecosystems will be accomplished.


1. Enough clean water for everyone

1.1 The prevention of water pollution
- Illegally discharged waste water from households, commerce and services, but also from the industry or leakage from environmental burdens and agricultural activity, significantlypollute surface and ground water. Strengthening and streamlining of controls, documentation of legal waste water disposal and a threat of real effective sanctions will help limit these actions.

1.3. Elimination of adverse impacts on water courses

- In terms of the impact on water status, there are three main groups of significant hydromorphological changes: a disruption of longitudinal connection of the rivers and the habitats, a disruption of transverse connection of wetlands and inundation with sewer and other morphological changes and hydrological changes. It is therefore essential to focus on the revitalization and re-naturalization of water courses and the adjacent riverine landscapes and to ensure the coherence of water courses, which is one of the basic conditions for the functioning of river ecosystems.
- The prioritization of renewal of land improvement channels will be set, depending on their function and use. Land improvement channels can also drain water from areas, where it is necessary. For this reason, it will be important to assess where the operation and maintenance of channels is needed and where it is environmentally harmful.


Slovak Water Plan (2016)

 

Environmental objectives aim to ensure and improve the quality of aquatic ecosystems and sustainable, balanced and equitable water use. Environmental targets are defined for surface water bodies, the groundwater bodies and the protected areas.


Environmental target for surface water bodies is to perform measures aimed at:

  • Preventing deterioration of the condition of surface water bodies;
  • Protection, improvement and renewal of surface water bodies so that the good condition of surface water is achieved until 22 December 2015 and 2021, respectively;
  • Protection and improvement of artificial and considerably changed surface water bodies so that the good ecological potential and good chemical condition are achieved until 22 December 2015 and 2021, respectively;
  • Gradual decreasing in pollution by priority substances and stopping or gradual termination of emissions, discharge and leakages of priority dangerous substances.

 

 

Strategy of SR adaptation to adverse impacts of climate change (2018)

 

5. Strategy objectives

To propose appropriate set of proactive adaptation measures and mechanisms to their implementation within the framework of sectoral policies, development strategies and action plans at all levels of the process;

8. Proposed adaptation measures in individual areas

8.5.3. Water management

Adaptation measures in our country should be directed to the compensation of drought manifestations, i.e. the decrease of flows and water resource yields, as well as to minimization of adverse consequences of flooding, particularly of flash floods in mountain and foothill areas. Adapting to the climate change in water management area should be focused on the implementation of measures leading to the creation of conditions for the better management of runoff in the river basin.

Water is becoming a critical strategic resource of the state which must be protected, and its efficient and effective use must be managed, in accordance with an objective of sustainable development ensuring. Rightly, the biggest attention is paid to water resources, their conservation and the need for more efficient use.

Measures to prevent degradation of water by contamination

- reducing contaminants in water bodies in accordance with the Slovak Water Plan

Key question

Have the requirements for surface water quality been met?

Key messages

  • The surface water quality met the limits for selected general indicators and indicators of radioactivity in all monitored areas in 2020. Limits were exceeded mainly in synthetic and non-synthetic substances, hydro-biological and microbiological indicators and in general indicators - mainly nitrite-nitrogen.
  • In accordance with the requirements of Directive 2000/60/EC (Framework Directive on Water) the water quality is expressed by the ecological and chemical status of surface water bodies. In that period a bad and very bad ecological status of surface water bodies were observed in 8.94% of water bodies with a length of 2 159.41 kilometres. 37 (2.45%) surface water bodies did not reach good chemical status.
Change since 2005 Change since 2015 Last year-on-year change
emo_neutral emo_neutral Neutralny trend
Since 2007, surface water quality indicators have been monitored according to the approved Program of surface waters status monitoring and have been evaluated in accordance with Annex no.1 of GR no. 269/2010 Coll. in indicators A, B, C, D and E. Nitrite-nitrogen and hydrobiological and microbiological indicators were frequently exceeded in all river.
Requirements for surface water quality according to GR no. 269/2010 Coll. met selected general indicators and indicators of radioactivity, the limits in the group of synthetic and non-synthetic substances and hydrobiological and microbiological indicators were still exceeded.
From the general requirements the GR was met by: selected general indicators and radioactivity indicators. The values of GR No. 269/2010 Coll. and priority substancese were evaluated  by GR of environmental quality standards (GR No.167/2015 Coll.) and  requirements were exceeded in a group of synthetic substances, non-synthetic substances and hydro-biological and microbiological indicators.

 

Summary assessment

The number of monitored sites and indicators not meeting the general requirements for the  surface water quality in accordance with the Government Regulation no. 269/2010 Coll., part A and E.
International river basin Sub-basin Number of monitored sites in sub-basin Indicators not meeting the requirements for the  surface water quality
under the Annex no.1
Monitored not meeting the require
ments
General indicators (A) hydrobiological and microbiological
indicators (E)
Danube Morava 32 22
CODCr,N-NH4,N-NO2,N-NO3, O2,Ptot., pH, Ca, EK (conductivity),Al, AOX
abundance of phytoplankton,
chorophyll-a, saprobic index of bioseston, culturable microorganisms at 22 oC
Danube Dunaj 18 12 N-NO2, pH coliform bacteria, culturable microorganisms at 22 oC
Danube Váh 152 113 pH, TOC, EK (conductivity), N-NO2, N-NO3, N-NH4, Ca, Ptot., Norg., BOD5, O2, Cl-, Na, Al,Fe,FN,Cr(IV), AOX, SO42-Ntot., CODCr abundance of phytoplankton, coliform bacteria, saprobic index of bioseston, chorophyll-a, culturable microorganisms at 22 oC
Danube Hron 39 25 O2, BOD5, CODCr, pH, N-NO2, N-NO3,  Ptot.., Ca, AOX, N-NH4,EK (conductivity),TOC coliform bacteria, saprobic index of bioseston, culturable microorganisms at 22 oC
Danube Ipeľ 23 15 O2,  CODCr, pH, EK (conductivity), N-NH4, N-NO2, N-NO3, Ptot., Ntot., Ca, AOX abundance of phytoplankton,
chorophyll-a, culturable microorganisms at 22 oC
Danube Slaná 23 15 O2, BOD5, CODcr, pH, EK (conductivity),
Ptot.,Ca, N-NH4, N-NO2, N-NO3,Ntot., AOX
thermotolerant col. bacteria, intestinal enterococci,
culturable microorganisms at 22 oC
Danube Bodrog 38 27 CODCr, N-NO2, AOX,  N-NH4,O2, N-NO3,Ptot., Ca,  NELuv
abundance of phytoplankton, saprobic index of bioseston, intestinal enterococci,
chorophyll-a, thermotolerant col. bacteria, culturable microorganisms at 22 oC
Danube Hornád 29 20 CODCr,N-NO2,  Ptot., EK (conductivity), N-NO3, Ca, AOX, F-, N-NH4, SO42- Al, NELuv saprobic index of bioseston,
intestinal enterococci,
thermotolerant col. bacteria, culturable microorganisms
at 22 oC
Danube Bodva 16 13 O2, CODCr,N-NH4,N-NO2, Ntot.,Ptot., NELuv, N-NO3, AOX, Ca, Al intestinal enterococci, coliform bacteria, chorophyll-a,
thermotolerant col. bacteria,
culturable microorganisms at 22 oC
Vistula Dunajec  and Poprad 11 5 CODCr,N-NO2, AOX,TOC NELuv

 
coliform bacteria, thermotolerant col. bacteria

* - potentially does not meet water quality requirements according to the Government Regulation 269/2010 Coll. (<12 measurements per year)
Source: SHMI

Indicators not meeting the general requirements for surface water quality in accordance with the Government Regulation no. 269/2010 Coll., part B and C
International river basin Sub-basin Indicators not meeting the requirements for the  surface water quality under the Annex no.1
non-synthetic substances (B) synthetic substances (C)
Danube Morava  Ni (AA)
FLU (AA), octylpfenol (AA),B(b)fluoranthene (HPC),B(ghi)perylene (HPC/HPC*),B(a)P (AA)*
Danube Dunaj   B(a)P (AA)*, FLU (AA)*
Danube Váh As (AA),Pb (AA),Cr (AA)
FLU (HPC,AA/AA*), octyplfenol (AA), B(b)fluoranthene (HPC), Benzo(k)fluoranthene (HPC), B(ghi)perylene (HPC/HPC*), B(a)P (AA*), heptachlorine (HPC*,AA*)
Danube Hron
Antracene (HPC), FLU (AA,HPC), B(b)fluorantene (HPC), B(k)fluorantene (HPC),PCP (AA), octylpfenol (AA*), 4-nonylpfenol (AA*), Cyklod. pesticídy (AA), Chlorphyrifos (AA), B(a)P (AA*), Heptachlorine (AA*,HPC*), TBT (AA*)
Danube Ipeľ Zn (AA)
FLU (AA),B(a)P (AA*),B(ghi)perylene (HPC)
Danube Slaná Octylpfenol (AA*),
Danube Bodrog  
B(b)fluorantene (HPC),B(ghi)perylene (HPC),FLU (AA),PCB a jeho kongenéry (8,28, 52, 101) (AA),B(a)P (AA)*
Danube Hornád   CN (AA),TBT (AA)*, B(a)P (AA)*, FLU (AA),
 
Danube Bodva   B(a)P (AA)*
Vistula Dunajec and Poprad B(a)P (AA)*
AA – exceedance of annual average
HPC- exceedance of highest permissible concentration
* - potentially does not meet water quality requirements according to the Government Regulation 269/2010 Coll. (<12 measurements per year)
Source: SHM

 

Detailed assessment

In 2020, qualitative indicators of surface water were monitored under an approved Water status monitoring program for 2020. 458 sites were monitored in a basic and operational mode. As a rule, the frequency of monitoring is evenly distributed during the calendar year, i.e. 12 times a year in accordance with the monitoring program. The less frequent monitoring is carried out in case of some biological indicators that are observed seasonally (2-7 times per year), radioactivity indicators (4 times per year) and relevant substances 4 times a year.

The number of monitored sites of surface water by sub-basins in 2020
Sub-basin Number of assessed sites according to monitoring type
  Basic Operational Basic and operational Protected areas - drinking water In total
Sub-basin Morava 8 16 8   32
Sub-basin Dunaj 8 1 9   18
Sub-basin Váh 20 108 16 24 168
Sub-basin Hron 10 26 3 6 45
Sub-basin Ipeľ 7 14 2 3 26
Sub-basin Slaná 2 19 2   23
Sub-basin Bodrog 4 23 10 20 57
Sub-basin Hornád 7 18 3 18 46
Sub-basin Bodva   13 1 5 19
Sub-basin Dunajec and Poprad 3 5 3 13 24
Total 69 243 57 89 458
Source: SHMI


The monitored sites of surface water quality in Slovakia in 2020

Requirements for the surface water quality listed in the Regulation of the Government have been met in all monitored places in the following indicators:
  • general indicators (Part A): temperature, magnesium, sodium, surfactants, cobalt, selenium, vanadium, chlorebenzene, PAL-A, RL550, RL105, dichlorobenzenes (DCB), 2,4,6 – trichlorophenol (2,4,6,TCP),1,2-cis-dichloretene (1,2-DCE), 2-monochlorpfenol (CP)
  • radioactivity indicators (Part D): total volume activity alpha and beta, tritium, strontium, caesium.


Requirements for the surface water quality listed in the Regulation of the Government for the groups of non-synthetic and synthetic substances (Parts B and C) have not been met in the following indicators:

  • As, Cd, Hg, Zn, Cu, Pb,Cd,Ni, total cyanides and PCB a jeho kongenéry (8,28,53 a 101).

 
From the group of hydrobiological and microbiological indicators (Part E), the requirements specified in the Regulation of the Government have not been met in the following indicators:

  • saprobe index bioseston, abundance phytoplankton, chlorophyll "a" and coliform bacteria, thermotolerant coliform bacteria, intestinal enteroocci and cultivable microorganisms at a temperature of 22 oC.

Most exceeding of the limit values pursuant to Annex No. 1 of the Regulation of the Government in general indicators were in the indicator of nitrite nitrogen in all partial catchment areas.
 
In 2020, priority substances and some other substances were evaluated pursuant to the Regulation of the Government of the Slovak Republic No. 167/2015 Coll. on environmental quality standards in the sphere of water policy. 
The highest admissible concentration of the environmental quality standard (EQS) was exceeded for As, Cr and Pb. The annual mean of EQS was exceeded for fluoranthene, benzo(a)pyrene, benzo(b)fluorantene, benzo(k)fluorantene, benzo(g,h,i,)perylene, antracene, octylpfenol ((4-(1,1',3,3'-tetrametylbutyl)fenol)), nonylpfenol, pentachlorpfenol, cyklodiénové pesticidy a chlorpyrifos, zlúčeniny tributycínu a heptachlor.

 

Evaluation of the condition of surface water bodies

Evaluation of the ecological status of surface water bodies for the reference period of 2009 – 2012 was conducted in 1,510 natural water bodies of surface water. The best situation from the perspective of the ecological status was recorded in partial catchment areas of Poprad and Dunajec, Bodrog, Hornád, Slaná, Hron, and Váh.
 
The very good and good ecologial status were recorded in 56.29% with length of 8,073.43 km. 34.77% of water bodies were found in the average ecological status, which represents length of 7,565.46 km. The bad and very bad sttatus were established in 8.94% of water bodies with length of 2,159.41 km.


 
The evaluation of chemical status of surface water bodies in 2009 – 2012 was conducted in 1,510 water bodies. The good chemical status was achieved in 1,473 (97.5%) water bodies of Slovakia and 37 (2.5%) water bodies did not achieve the good chemical status. 
 
In total, 3.2% of length of water bodies of the SR do not achieve the good chemical status. The most non-favourable status is in the partial catchment area of Bodva (18.2%) and in partial catchment area of Slaná where 8.7% of length do not achieve the good chemical status. The biggest share of water bodies with the good chemical status in the total number of water bodies in the catchment area is in the catchment area of Morava, Danube and Poprad and Dunajec. In the absolute terms, the most water bodies (in terms of both their number and length) achieving the good chemical status, but also not achieving the good chemical status are in the partial catchment area of the rivers of Váh and Bodrog with respect to their larger area.

 

Contact

Ing. Ľubica Koreňová, SAŽP, lubica.korenova@sazp.sk

Related definitions:

The surface water quality complies with the requirements set out in Annex no. 1, if the value calculated from the data collected during the year is below or equal to the value for a relevant water quality indicator. (section 3, par.1of the SR Government regulation(GR) no. 269/2010 Coll.)

The surface water status is the general expression of surface water body status determined by an ecological status and chemical status, depending on which one is worse. The status of heavily modified water bodies or artificial water bodies is determined by an ecological potential.

An ecological status expresses the quality of structure and function of aquatic ecosystems that are bound to surface waters. The ecological status is defined by the biological elements of quality, elements supporting the biological quality elements, which are hydromorphological quality elements, chemical and physico-chemical elements of quality and specific pollutants.

The good ecological status of surface waters is the status of surface waters stipulated by the generally binding legislation according to the section 81 par.1, point f). A good surface water chemical status is the chemical status of surface water body in which the reached concentrations of pollutants do not exceed the environmental standards of quality, laid down by the generally binding legal regulation according to the section 81 par.1, point f).
(Section 4 Act no. 364/2004 Coll. Water Act)


Methodology:

The basis of surface water quality assessment is a summary of classification results under STN 75 7221 "Water quality. Quality classification of surface waters", which assesses the water quality in 8 groups of indicators (group A - oxygen regime, group B - basic physical-chemical indicators, group C- nutrients, group D - biological indicators, E group - microbiological indicators, F group - micropollutants, G group -toxicity, H group - radioactivity), and using the limit values set categorizes waters under their quality into five classes (Class I - very clean water, up to Class V - very heavily polluted water, whereby levels I, II and III of water quality are considered favourable water quality) .

Qualitative indicators monitored in all monitored areas (basic and operational) in 2013 were evaluated in accordance with the SR Government Regulation no. 398/2012 Coll., amending and supplementing the SR Government Regulation no. 269/2010 Coll., laying down the requirements for the achievement of good water status.
The surface water quality assessment is conducted based on the data obtained in the water status monitoring. The monitoring of SR´s surface waters has been divided in terms of SR MoAERD Decree no.418/2010 Coll. on the Implementation of certain provisions of the Water Act into a basic, operational, exploratory monitoring and monitoring of protected areas (PAs).

The frequency of quality indicators monitoring was consistent throughout the calendar year; i.e. 12 times a year in accordance with the monitoring program. The less frequent monitoring is carried out in case of some biological indicators that are observed seasonally (2-7 times per year), radioactivity indicators (4 times per year) and relevant substances (4 times a year). If certain synthetic and non-synthetic indicators were not monitored 12 times a year (priority substances) and 4 times per year (relevant substances), in respective tables there was marked a potential failure (*; PF) to fulfil the requirements of Annex no. 1 to GR no. 269/2010 Coll. as amended by GR 396/2012 Coll.
State monitoring network


Data sources:

SHMI


Related indicators:


Related international indicators:


Linked references: