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River basin

Water pollution in the Slaná basin

Sites in the 2025 yearbook
17
Failed the standard (82%)
14
Counted in the score
7

River basin overview

In the Slaná basin the SHMÚ yearbook has 17 monitoring sites; in 2025, 14 of them (82%) failed the standard for at least one indicator. 7 are counted in the scores of the fishing districts.

Watercourse profile of Slaná

SHMÚ sites from source to mouth

Watercourse profile from source to mouthnumber of unmet indicators in 2025 at SHMÚ sites

012345Vlachovo (above the mouth of the Dobšinský potok), river km 78.2: 1 indicator (2025)Nižnoslanská Baňa, river km 67.8: no failed standard (2025)Nižná Slaná, river km 66.0: 2 indicators (2025)Rožňava, above (Nadabula), river km 55.5: 4 indicators (2025)Čoltovo, river km 28.2: no failed standard (2025)Lenartovce, river km 3.3: 1 indicator (2025)Sajópüspöki, river km 0.0: 5 indicators (2025)river km 78 (upper course)river km 0 (towards the mouth)
Show sites in the table (7)
  • Vlachovo (above the mouth of the Dobšinský potok)river km 78.21 indicator
  • Nižnoslanská Baňariver km 67.8no unmet standard
  • Nižná Slanáriver km 66.02 indicators
  • Rožňava, above (Nadabula)river km 55.54 indicators
  • Čoltovoriver km 28.2no unmet standard
  • Lenartovceriver km 3.31 indicator
  • Sajópüspökiriver km 0.05 indicators
  • standard not met
  • no unmet standard
  • site not in the yearbook

Year-by-year trend

Share of sites in the river basin that failed the standard
  1. 202210 of 1191%
  2. 202314 of 1974%
  3. 202419 of 2095%
  4. 202514 of 1782%

Worst sites in the river basin

Click to expand the history by yearFailed a standard14 / 17
  1. Rimavské JanovceRimava, river km 26.51 indicator in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon·standard met●standard not met●standard not met·standard met
    Nutrients and nitrogen
    nitrites●standard not met●standard not met·standard met·standard met
    total phosphorus·standard met·standard met●standard not met·standard met
    Harmful organic substances
    AOX (adsorbable organic halogens)·standard met●standard not met●standard not met●standard not met
    Biology and bacteria
    saprobic index of bioseston·standard met●standard not met·standard met·standard met

    Nearest site for the fishing districts: Rimava č. 2, Rimava č. 3

  2. SajópüspökiSlaná, river km 0.05 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)·standard met●standard not met●standard not met·standard met
    Nutrients and nitrogen
    nitrites●standard not met●standard not met●standard not met●standard not met
    Harmful organic substances
    AOX (adsorbable organic halogens)●standard not met·standard met·standard met·standard met
    Salts, pH and minerals
    manganese·standard met·standard met●standard not met·standard met
    iron·standard met·standard met●standard not met·standard met
    Biology and bacteria
    coliform bacteria●standard not met●standard not met●standard not met●standard not met
    culturable microorganisms (22 °C)●standard not met●standard not met●standard not met●standard not met
    thermotolerant coliform bacteria●standard not met●standard not met●standard not met●standard not met
    intestinal enterococci●standard not met●standard not met●standard not met·standard met
    saprobic index of bioseston·standard met·standard met·standard met●standard not met

    The location of the site is only approximate (based on the water body).

  3. Jelšava, belowMuráň, river km 21.31 indicator in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon·standard met●standard not met●standard not met·standard met
    Nutrients and nitrogen
    nitrites●standard not met●standard not met·standard met·standard met
    Harmful organic substances
    AOX (adsorbable organic halogens)·standard met●standard not met●standard not met●standard not met

    Nearest site for the fishing districts: Muráň č. 1, Muráň č. 2, Muráň č. 3, VN Jelšava

    The location of the site is only approximate (based on the water body).

  4. BehynceTuriec, river km 1.61 indicator in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon·standard met●standard not met●standard not met·standard met
    Nutrients and nitrogen
    nitrites●standard not met·standard met·standard met·standard met
    Harmful organic substances
    AOX (adsorbable organic halogens)·standard met●standard not met●standard not met●standard not met

    Nearest site for the fishing districts: Turiec č.1 (Tornaľa)

    The location of the site is only approximate (based on the water body).

  5. ČoltovoSlaná, river km 28.20 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon·standard met●standard not met●standard not met·standard met
    Nutrients and nitrogen
    nitrites●standard not met●standard not met·standard met·standard met
    Harmful organic substances
    AOX (adsorbable organic halogens)·standard met●standard not met●standard not met·standard met
    Salts, pH and minerals
    manganese·standard met●standard not met●standard not met·standard met
    aluminum·standard met·standard met●standard not met·standard met
    iron·standard met●standard not met·standard met·standard met

    Nearest site for the fishing districts: Slaná č. 2a

  6. LenartovceSlaná, river km 3.31 indicator in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)–site not in the yearbook·standard met●standard not met·standard met
    Nutrients and nitrogen
    nitrites–site not in the yearbook·standard met●standard not met●standard not met
    Salts, pH and minerals
    manganese–site not in the yearbook●standard not met●standard not met·standard met
    aluminum–site not in the yearbook·standard met●standard not met·standard met
    iron–site not in the yearbook·standard met●standard not met·standard met

    Nearest site for the fishing districts: Slaná č. 1

  7. Martinová (road bridge, below)Belínsky potok, river km 0.96 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    total organic carbon–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Salts, pH and minerals
    pH–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    conductivity–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    calcium–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

  8. VčelinceHubovský potok, river km 0.58 indicators in 2023
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    total organic carbon–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    Nutrients and nitrogen
    nitrates–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    total nitrogen–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    total phosphorus–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    Salts, pH and minerals
    pH–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    calcium–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

  9. Jesenské, aboveKatínsky kanál, river km 1.44 indicators in 2024
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    Nutrients and nitrogen
    nitrates–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    total nitrogen–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    total phosphorus–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
  10. Papča, mouth (Teplý Vrch, below)Papča, river km 0.93 indicators in 2024
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    Nutrients and nitrogen
    total phosphorus–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

    Nearest site for the fishing districts: VN Teplý Vrch

    The location of the site is only approximate (based on the water body).

  11. Dechtársky potok, mouthDechtársky potok, river km 0.12 indicators in 2024
    Indicator2022202320242025
    Oxygen and organic matter
    dissolved oxygen–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    Nutrients and nitrogen
    total phosphorus–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
  12. Nižná SlanáSlaná, river km 66.02 indicators in 2025
    Indicator2022202320242025
    Metals
    arsenic–site not in the yearbook●standard not met●standard not met·standard met
    nickel–site not in the yearbook●standard not met●standard not met·standard met
    Salts, pH and minerals
    manganese–site not in the yearbook●standard not met●standard not met●standard not met
    iron–site not in the yearbook●standard not met●standard not met●standard not met
    aluminum–site not in the yearbook·standard met●standard not met·standard met

    The location of the site is only approximate (based on the water body).

  13. Kaloša, mouth (Rumince, above)Kaloša, river km 0.96 indicators in 2023
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    Nutrients and nitrogen
    nitrates–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    total phosphorus–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    Salts, pH and minerals
    conductivity–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    calcium–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

    The location of the site is only approximate (based on the water body).

  14. Lúčka, mouthLúčka, river km 1.62 indicators in 2025
    Indicator2022202320242025
    Nutrients and nitrogen
    nitrates–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Salts, pH and minerals
    conductivity–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
  15. Kováčová, belowČremošná, river km 18.12 indicators in 2024
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

  16. Čremošná, mouthČremošná, river km 0.12 indicators in 2024
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

  17. Držkovce podVýchodný Turiec, river km 6.02 indicators in 2023
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

    Nearest site for the fishing districts: Východný Turiec č. 1, Východný Turiec č. 2

    The location of the site is only approximate (based on the water body).

  18. Revúca, aboveZdychava, river km 3.02 indicators in 2023
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

    Nearest site for the fishing districts: Zdychava č. 1, Zdychava č. 2

  19. VlkyňaRimava, river km 1.62 indicators in 2022
    Indicator2022202320242025
    Nutrients and nitrogen
    nitrites●standard not met–site not in the yearbook–site not in the yearbook–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene●standard not met–site not in the yearbook–site not in the yearbook–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

    Nearest site for the fishing districts: Rimava č. 1

  20. Štrkovec, above (cemetery)Konský potok, river km 1.11 indicator in 2024
    Indicator2022202320242025
    Harmful organic substances
    octylphenol●standard not met–site not in the yearbook·standard met–site not in the yearbook
    Salts, pH and minerals
    calcium●standard not met–site not in the yearbook·standard met–site not in the yearbook
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene·standard met–site not in the yearbook●standard not met–site not in the yearbook

    Polycyclic aromatic hydrocarbons. The standard for benzo(a)pyrene is extremely low (0.17 ng/l), so most streams exceed it; the main sources are combustion and atmospheric deposition.

  • standard not met
  • no unmet standard
  • site not in the yearbook

Fishing districts near these sites

Fishing districts whose nearest SHMÚ site lies in this river basin
  • Slaná č. 2bsite Rožňava, above (Nadabula) · standard not met in 3 of 4 years · nitrates in the groundwater nearby 9.6 mg/l4 indicators
  • Slaná č. 2csite Rožňava, above (Nadabula) · standard not met in 3 of 4 years · nitrates in the groundwater nearby 25.4 mg/l4 indicators
  • Slaná č. 3asite Rožňava, above (Nadabula) · standard not met in 3 of 4 years · nitrates in the groundwater nearby 0.5 mg/l4 indicators
  • Slaná č.3bsite Rožňava, above (Nadabula) · standard not met in 3 of 4 years · nitrates in the groundwater nearby 7.3 mg/l4 indicators
  • VN Teplý Vrchsite Papča, mouth (Teplý Vrch, below) · standard not met in 1 of 4 years · nitrates in the groundwater nearby 2.4 mg/l3 indicators
  • Rimava č. 1site Vlkyňa · standard not met in 1 of 4 years · nitrates in the groundwater nearby 7.2 mg/l2 indicators
  • Rimava č. 4site Rimavská Baňa · standard not met in 1 of 4 years · nitrates in the groundwater nearby 7.8 mg/l2 indicators
  • Rimava č. 5asite Rimavská Baňa · standard not met in 1 of 4 years · nitrates in the groundwater nearby 4.5 mg/l2 indicators
  • VN Kurinecsite VN Kurinec, below · standard not met in 1 of 4 years · nitrates in the groundwater nearby 1.5 mg/l2 indicators
  • Východný Turiec č. 1site Držkovce pod · standard not met in 1 of 4 years · nitrates in the groundwater nearby 0.5 mg/l2 indicators
  • Východný Turiec č. 2site Držkovce pod · standard not met in 1 of 4 years · nitrates in the groundwater nearby 21.9 mg/l2 indicators
  • Zdychava č. 1site Revúca, above · standard not met in 1 of 4 years · nitrates in the groundwater nearby 40.3 mg/l2 indicators
  • Zdychava č. 2site Revúca, above · standard not met in 1 of 4 years · nitrates in the groundwater nearby 21.9 mg/l2 indicators
  • Muráň č. 1site Jelšava, below · standard not met in 4 of 4 years · nitrates in the groundwater nearby 0.5 mg/l1 indicator
  • Muráň č. 2site Jelšava, below · standard not met in 4 of 4 years · nitrates in the groundwater nearby 2.5 mg/l1 indicator
  • Muráň č. 3site Jelšava, below · standard not met in 4 of 4 years · nitrates in the groundwater nearby 21.9 mg/l1 indicator
  • Rimava č. 2site Rimavské Janovce · standard not met in 4 of 4 years · nitrates in the groundwater nearby 1.5 mg/l1 indicator
  • Rimava č. 3site Rimavské Janovce · standard not met in 4 of 4 years · nitrates in the groundwater nearby 4.5 mg/l1 indicator
  • Turiec č.1 (Tornaľa)site Behynce · standard not met in 4 of 4 years · nitrates in the groundwater nearby 1.8 mg/l1 indicator
  • VN Jelšavasite Jelšava, below · standard not met in 4 of 4 years · nitrates in the groundwater nearby 2.5 mg/l1 indicator
  • Slaná č. 1site Lenartovce · standard not met in 3 of 4 years · nitrates in the groundwater nearby 10.0 mg/l1 indicator
  • Rimava č. 5 bsite Tisovec, above (above the confluence with Kačkava) · standard not met in 1 of 4 years · nitrates in the groundwater nearby 5.2 mg/l1 indicator
  • Rimava č. 6 (Tisovská Rimava)site Tisovec, above (above the confluence with Kačkava) · standard not met in 1 of 4 years · nitrates in the groundwater nearby 6.4 mg/l1 indicator
  • Rimava č. 7site Tisovec, above (above the confluence with Kačkava) · standard not met in 1 of 4 years · nitrates in the groundwater nearby 6.4 mg/l1 indicator
  • Rimavicasite Utekáč, above · standard not met in 1 of 4 years · nitrates in the groundwater nearby 4.5 mg/l1 indicator
  • Slaná č. 4site Vlachovo (above the mouth of the Dobšinský potok) · standard not met in 1 of 4 years · nitrates in the groundwater nearby 5.5 mg/l1 indicator
  • VN Tisovecsite Tisovec, above (above the confluence with Kačkava) · standard not met in 1 of 4 years · nitrates in the groundwater nearby 7.2 mg/l1 indicator
  • Slaná č. 2asite Čoltovo · standard not met in 3 of 4 years · nitrates in the groundwater nearby 9.6 mg/lno unmet standard

What most often fails

Number of sites in the river basin that failed this indicator in 2025
  1. benzo(a)pyrenePAHs (combustion and deposition)6
  2. AOX (adsorbable organic halogens)Harmful organic substances3
  3. conductivitySalts, pH and minerals3
  4. ironSalts, pH and minerals2
  5. manganeseSalts, pH and minerals2
  6. nitritesNutrients and nitrogen2
  7. pHSalts, pH and minerals2
  8. calciumSalts, pH and minerals2
  9. fluoranthenePAHs (combustion and deposition)1
  10. nitratesNutrients and nitrogen1
  11. saprobic index of biosestonBiology and bacteria1
  12. coliform bacteriaBiology and bacteria1
  • counted in the fishing district score
  • shown, not counted in the score

Where the data come from and what they do not say

  • Surface waters: yearbooks of the Slovak Hydrometeorological Institute (SHMÚ) Surface Water Quality for the years 2022 to 2025. We transcribed the list of sites and indicators that failed the standard under Government Regulation no. 269/2010 Coll. into a table in the plugin. Older yearbooks are in a different format and we did not include them.
  • Groundwater: SHMÚ yearbooks Groundwater Quality, stations and indicators exceeded in 2017 to 2025 according to the drinking-water limits. The connection to the fishing district is only indirect.
  • Groundwater, measured values: the public SHMÚ interface "Groundwater quality monitoring results". We have actually measured values (nitrates, ammonium, iron, chlorides, metals, pesticides, PFAS, solvents) for 758 stations; for each substance we take the highest value from the samples in 2025 (for stations without data for that year, from one of the two previous years). A value equal to the standard counts as an exceedance, as it does at SHMÚ.
  • Treatment plants: register of wastewater treatment plants (VÚVH, EEA) from the "Points near fishing districts" file, that is, only plants within 2 km of the fishing district line. There are considerably more treatment plants in Slovakia.

What this data does not say. The yearbook lists the sites that failed the standard. A site missing from it is not proof of clean water, so the score of a fishing district is only ever lowered and never raised. We did not include industrial polluters (the National Pollution Register) in the list because the register was unavailable when the data was collected, and for wastewater treatment plants we list only those we found near the fishing districts. Only 31% of SHMÚ sites have an exact location, 47% have only an approximate location (based on the water body, so they count less near the fishing districts) and 22% have no location at all, so we do not assign them to any fishing district. We determine the distance, the match of the watercourse name and the ranking ourselves; the assignment is indicative.