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River basin

Water pollution in the Váh basin

Sites in the 2025 yearbook
76
Failed the standard (72%)
55
Counted in the score
21

River basin overview

In the Váh basin the SHMÚ yearbook has 76 monitoring sites; in 2025, 55 of them (72%) failed the standard for at least one indicator. 21 are counted in the scores of the fishing districts.

Watercourse profile of Váh

SHMÚ sites from source to mouth

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

0123456Liptovský Mikuláš, Liptovská Mara, above, river km 346.7: 1 indicator (2022)inflow into the Liptovská Mara reservoir, river km 344.9: no failed standard (2024)Hubová, river km 308.8: 1 indicator (2025)Stankovany, river km 304.5: no failed standard (2023)Nezbudská Lúčka, bridge, river km 266.5: no failed standard (2025)wastewater outfall from VAS a.s. Mojšova Lúčka, below, river km 260.7: no failed standard (2022)VD ZA reservoir, Hruštiny, river km 258.5: 1 indicator (2024)Biocorridor, above the facility, river km 258.5: 1 indicator (2024)Storage reservoir, right side of the small hydropower plant, river km 258.5: 1 indicator (2024)Budatín, bridge Dolná Street, river km 252.3: 1 indicator (2023)VN Hričov, below, river km 247.0: no failed standard (2025)Mikšová near, bridge, river km 230.1: no failed standard (2024)Piešťany, river km 122.8: no failed standard (2025)Hlohovec, river km 100.7: 1 indicator (2025)Sereď, above, river km 81.0: 6 indicators (2025)Šaľa, river km 58.5: 1 indicator (2023)Vlčany, river km 41.7: no failed standard (2025)Komárno, river km 1.5: 5 indicators (2025)river km 347 (upper course)river km 2 (towards the mouth)
Show sites in the table (18)
  • Liptovský Mikuláš, Liptovská Mara, aboveriver km 346.71 indicator
  • inflow into the Liptovská Mara reservoirriver km 344.9no unmet standard
  • Hubováriver km 308.81 indicator
  • Stankovanyriver km 304.5no unmet standard
  • Nezbudská Lúčka, bridgeriver km 266.5no unmet standard
  • wastewater outfall from VAS a.s. Mojšova Lúčka, belowriver km 260.7no unmet standard
  • VD ZA reservoir, Hruštinyriver km 258.51 indicator
  • Biocorridor, above the facilityriver km 258.51 indicator
  • Storage reservoir, right side of the small hydropower plantriver km 258.51 indicator
  • Budatín, bridge Dolná Streetriver km 252.31 indicator
  • VN Hričov, belowriver km 247.0no unmet standard
  • Mikšová near, bridgeriver km 230.1no unmet standard
  • Piešťanyriver km 122.8no unmet standard
  • Hlohovecriver km 100.71 indicator
  • Sereď, aboveriver km 81.06 indicators
  • Šaľariver km 58.51 indicator
  • Vlčanyriver km 41.7no unmet standard
  • Komárnoriver km 1.55 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. 202270 of 8979%
  2. 202365 of 9370%
  3. 202463 of 10063%
  4. 202555 of 7672%

Fishing district map

Fishing districts in the “Váh river basin” by nearest SHMÚ site

Detailed filtersregion, district, riverbed, depth, shading, satellites, water chemistry and pollution, fish, geology

1445fishing districts
Pick a category to narrow the selection. Next to each option you can see how many fishing districts remain.
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The color of the fishing district line shows the number of indicators that failed the standard at the nearest SHMÚ site (2025). Gray fishing districts have no site with the same watercourse name nearby. You can also switch the color to groundwater and treatment plants.

Worst sites in the river basin

Click to expand the history by year

  1. WWTP Jablonka, belowBlack Orava, river km 3.23 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    total organic carbon·standard met●standard not met●standard not met●standard not met
    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 not met·standard met●standard not met
    Biology and bacteria
    saprobic index of biosestone●standard not met●standard not met●standard not met·standard met
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene●standard not met●standard not met●standard not met·standard 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.

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

  2. Široká landfill, belowBP Oravy (Homôlka), river km 0.29 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)●standard not met●standard not met·standard met·standard met
    Nutrients and nitrogen
    ammonium●standard not met·standard met●standard not met●standard not met
    total phosphorus●standard not met●standard not met·standard met●standard not met
    total nitrogen·standard met·standard met·standard met●standard not met
    Metals
    arsenic●standard not met●standard not met●standard not met●standard not met
    chromium●standard not met·standard met·standard met●standard not met
    Harmful organic substances
    AOX (adsorbable organic halogens)·standard met·standard met·standard met●standard not met
    total cyanides·standard met·standard met●standard not met·standard met
    Salts, pH and minerals
    pH●standard not met●standard not met●standard not met●standard not met
    conductivity●standard not met●standard not met●standard not met●standard not met
    dissolved solids (105 °C)●standard not met●standard not met·standard met●standard not met
    chlorides●standard not met·standard met·standard met·standard met
    fluorides●standard not met·standard met·standard met·standard met
    PAHs: 2 substances (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene·standard met·standard met●standard not met·standard met
    benzo(ghi)perylene·standard met·standard met●standard not met·standard 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.

  3. Šárd – Horné SalibyŠárd, river km 1.87 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    dissolved oxygen●standard not met●standard not met–site not in the yearbook●standard not met
    BOD₅ (biochemical oxygen demand)●standard not met·standard met–site not in the yearbook●standard not met
    total organic carbon·standard met·standard met–site not in the yearbook●standard not met
    Nutrients and nitrogen
    total phosphorus●standard not met●standard not met–site not in the yearbook●standard not met
    ammonium●standard not met·standard met–site not in the yearbook●standard not met
    Salts, pH and minerals
    conductivity●standard not met●standard not met–site not in the yearbook●standard not met
    calcium●standard not met·standard met–site not in the yearbook·standard met
    PAHs: 1 substance (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene·standard met●standard not met–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.

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

  4. Sereď, aboveVáh, river km 81.06 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)·standard met·standard met–site not in the yearbook●standard not met
    COD (chemical oxygen demand)·standard met·standard met–site not in the yearbook●standard not met
    dissolved oxygen·standard met·standard met–site not in the yearbook●standard not met
    Nutrients and nitrogen
    ammonium·standard met·standard met–site not in the yearbook●standard not met
    nitrites·standard met●standard not met–site not in the yearbook·standard met
    Harmful organic substances
    PFOS (perfluorooctane sulfonate)·standard met·standard met–site not in the yearbook●standard not met
    Salts, pH and minerals
    pH●standard not met·standard met–site not in the yearbook·standard met
    conductivity·standard met·standard met–site not in the yearbook●standard not met

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

  5. SmoleniceSmolenický P., river km 4.77 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    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
    Nutrients and nitrogen
    total phosphorus–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Harmful organic substances
    DEHP (phthalate)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    PAHs: 2 substances (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
    fluoranthene–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.

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

  6. KomárnoVáh, river km 1.55 indicators in 2025
    Indicator2022202320242025
    Nutrients and nitrogen
    nitrites●standard not met●standard not met●standard not met●standard not met
    Harmful organic substances
    AOX (adsorbable organic halogens)·standard met·standard met●standard not met●standard not met
    octylphenol●standard not met·standard met·standard met·standard met
    tributyltin·standard met·standard met·standard met●standard not met
    Biology and bacteria
    culturable microorganisms (22 °C)●standard not met●standard not met●standard not met·standard met
    phytoplankton abundance·standard met·standard met●standard not met·standard met
    chlorophyll a·standard met·standard met·standard met●standard not met
    PAHs: 2 substances (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene●standard not met·standard met●standard not met●standard not met
    fluoranthene·standard met·standard met●standard not met·standard 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.

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

  7. Jatov – Kendereš, behindTrnovec, river km 1.39 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    COD (chemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Nutrients and nitrogen
    ammonium–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    nitrates–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    total nitrogen–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    total phosphorus–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Salts, pH and minerals
    sulfates–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

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

  8. Svinianka, below the premises of AGRO PodhorieSvinianka, river km 7.06 indicators in 2024
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    COD (chemical oxygen demand)–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    dissolved oxygen–site not in the yearbook–site not in the yearbook●standard not met–site not in the yearbook
    Nutrients and nitrogen
    ammonium–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
  9. Brumov, belowVlára, river km 12.73 indicators in 2025
    Indicator2022202320242025
    Nutrients and nitrogen
    nitrites●standard not met●standard not met●standard not met●standard not met
    total phosphorus●standard not met·standard met·standard met·standard met
    Harmful organic substances
    AOX (adsorbable organic halogens)●standard not met●standard not met·standard met·standard met
    Salts, pH and minerals
    pH●standard not met●standard not met●standard not met·standard met
    calcium●standard not met·standard met·standard met·standard met
    PAHs: 3 substances (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene●standard not met●standard not met●standard not met●standard not met
    fluoranthene●standard not met●standard not met●standard not met●standard not met
    benzo(ghi)perylene●standard not met●standard not met·standard met·standard 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.

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

  10. Dolné DubovéDubovský P., river km 3.42 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)–site not in the yearbook·standard met●standard not met●standard not met
    Nutrients and nitrogen
    nitrates–site not in the yearbook·standard met●standard not met·standard met
    total phosphorus–site not in the yearbook·standard met·standard met●standard not met
    Salts, pH and minerals
    calcium–site not in the yearbook●standard not met●standard not met·standard met
    PAHs: 2 substances (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene–site not in the yearbook●standard not met·standard met·standard met
    fluoranthene–site not in the yearbook●standard not met·standard met·standard 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.

    Nearest site for the fishing districts: VN Dolné Dubové

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

  11. Chyžné (PL)Chyžnik, river km 1.05 indicators in 2023
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)●standard not met●standard not met–site not in the yearbook–site not in the yearbook
    COD (chemical oxygen demand)●standard not met●standard not met–site not in the yearbook–site not in the yearbook
    total organic carbon·standard met●standard not met–site not in the yearbook–site not in the yearbook
    dissolved oxygen●standard not met·standard met–site not in the yearbook–site not in the yearbook
    Nutrients and nitrogen
    ammonium●standard not met●standard not met–site not in the yearbook–site not in the yearbook
    nitrites●standard not met●standard not met–site not in the yearbook–site not in the yearbook
    total phosphorus●standard not met·standard met–site not in the yearbook–site not in the yearbook
  12. Hliník, aboveLándorský K., river km 6.36 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    COD (chemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    dissolved oxygen–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
    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.

  13. Trnava, below the WWTPTrnávka, river km 4.75 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
    dissolved oxygen–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Nutrients and nitrogen
    nitrates–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    total phosphorus–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

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

  14. BP Oravy (Pastorník), near the outfall of SEZ D.K. a.s.BP Oravy (Pastorník), river km 0.14 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
    Nutrients and nitrogen
    nitrites–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Metals
    copper–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Harmful organic substances
    AOX (adsorbable organic halogens)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
  15. Lietavská Svinná, belowSvinianka, river km 3.23 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    BOD₅ (biochemical oxygen demand)–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    Nutrients and nitrogen
    ammonium–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
    total phosphorus–site not in the yearbook–site not in the yearbook–site not in the yearbook●standard not met
  16. Častkovce, belowDubová, river km 10.86 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
    COD (chemical oxygen demand)–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    dissolved oxygen–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    Nutrients and nitrogen
    ammonium–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

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

  17. Považský ChlmecKysuca, river km 0.63 indicators in 2025
    Indicator2022202320242025
    Oxygen and organic matter
    COD (chemical oxygen demand)·standard met·standard met●standard not met·standard met
    total organic carbon·standard met·standard 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 not met·standard met·standard met·standard met
    PAHs: 3 substances (not counted in the score)
    Indicator2022202320242025
    PAHs (combustion and deposition)
    benzo(a)pyrene·standard met·standard met·standard met●standard not met
    benzo(b)fluoranthene·standard met·standard met·standard met●standard not met
    fluoranthene·standard met·standard met·standard met●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.

    Nearest site for the fishing districts: Kysuca č. 1, Kysuca č. 2a, Kysuca č. 2b, Kysuca č. 4

  18. HlohovecVáh, river km 100.71 indicator in 2025
    Indicator2022202320242025
    Harmful organic substances
    AOX (adsorbable organic halogens)●standard not met●standard not met●standard not met●standard not met
    Salts, pH and minerals
    pH●standard not met·standard met●standard not met·standard met

    Nearest site for the fishing districts: Váh č. 4, Váh č. 4a, Váh č. 5

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

  19. ŠanceKlanecnica, river km 16.36 indicators in 2024
    Indicator2022202320242025
    Nutrients and nitrogen
    nitrites●standard not met–site not in the yearbook●standard not met–site not in the yearbook
    total phosphorus●standard not met–site not in the yearbook●standard not met–site not in the yearbook
    nitrates●standard not met–site not in the yearbook·standard met–site not in the yearbook
    total nitrogen●standard not met–site not in the yearbook·standard met–site not in the yearbook
    organic nitrogen●standard not met–site not in the yearbook·standard met–site not in the yearbook
    Salts, pH and minerals
    pH·standard met–site not in the yearbook●standard not met–site not in the yearbook
    PAHs: 3 substances (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
    benzo(ghi)perylene·standard met–site not in the yearbook●standard not met–site not in the yearbook
    fluoranthene·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.

    Nearest site for the fishing districts: Klanečnica

  20. Dolné SalibySalibský Dudváh, river km 8.65 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
    COD (chemical oxygen demand)–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    dissolved oxygen–site not in the yearbook●standard not met–site not in the yearbook–site not in the yearbook
    Nutrients and nitrogen
    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

    Nearest site for the fishing districts: Štrkovisko Dolné Saliby

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

  • 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

  • Bošáčkasite Šiance · standard not met in 2 of 4 years · nitrates in the groundwater nearby 10.2 mg/l6 indicators
  • Klanečnicasite Šance · standard not met in 2 of 4 years · nitrates in the groundwater nearby 12.7 mg/l6 indicators
  • Petrovičkasite Petrovice, middle · standard not met in 2 of 4 years · nitrates in the groundwater nearby 4.2 mg/l5 indicators
  • Štrkovisko Dolné Salibysite Dolné Saliby · standard not met in 1 of 4 years · nitrates in the groundwater nearby 0.5 mg/l5 indicators
  • Čierňanka č. 1site Čadca, below · standard not met in 3 of 4 years · nitrates in the groundwater nearby 13.2 mg/l4 indicators
  • Čierňanka č. 2site Čadca, below · standard not met in 3 of 4 years · nitrates in the groundwater nearby 16.2 mg/l4 indicators
  • Gidra č. 1asite Malá Mača · standard not met in 1 of 4 years · nitrates in the groundwater nearby 27.2 mg/l4 indicators
  • Teplica č.1 (Turč. Teplice)site Malý Čepčín, below, road bridge towards Ivančina · standard not met in 1 of 4 years · nitrates in the groundwater nearby 13.1 mg/l4 indicators
  • Teplica č.2 (Turč. Teplice)site Malý Čepčín, below, road bridge towards Ivančina · standard not met in 1 of 4 years · nitrates in the groundwater nearby 7.6 mg/l4 indicators
  • Štiavniksite Štiavnik, above – water-supply watercourse · standard not met in 1 of 4 years · nitrates in the groundwater nearby 4.2 mg/l4 indicators
  • Štrkovisko Malá Mačasite Malá Mača · standard not met in 1 of 4 years · nitrates in the groundwater nearby 12.6 mg/l4 indicators
  • Štrkovisko Čierny Brodsite Čierny Brod · standard not met in 1 of 4 years · nitrates in the groundwater nearby 51.0 mg/l4 indicators
  • Kysuca č. 1site Považský Chlmec · standard not met in 4 of 4 years · nitrates in the groundwater nearby 25.1 mg/l3 indicators
  • Kysuca č. 2asite Považský Chlmec · standard not met in 4 of 4 years · nitrates in the groundwater nearby 11.2 mg/l3 indicators
  • Kysuca č. 2bsite Považský Chlmec · standard not met in 4 of 4 years · nitrates in the groundwater nearby 1.8 mg/l3 indicators
  • Kysuca č. 4site Považský Chlmec · standard not met in 4 of 4 years · nitrates in the groundwater nearby 0.5 mg/l3 indicators
  • Bystrica č. 1asite Bystrica, below the Nová Bystrica reservoir · standard not met in 2 of 4 years · nitrates in the groundwater nearby 3.3 mg/l3 indicators
  • Bystrica č. 1bsite Bystrica, below the Nová Bystrica reservoir · standard not met in 2 of 4 years · nitrates in the groundwater nearby 3.3 mg/l3 indicators
  • Bystrica č. 2site Bystrica, below the Nová Bystrica reservoir · standard not met in 2 of 4 years · nitrates in the groundwater nearby 1.9 mg/l3 indicators
  • Dubovásite Bašovce · standard not met in 2 of 4 years · nitrates in the groundwater nearby 0.5 mg/l3 indicators
  • Hričovský kanál č.2bsite Považské Podhradie · standard not met in 2 of 4 years · nitrates in the groundwater nearby 4.2 mg/l3 indicators
  • Nosický kanál č. 9site VN Nosice, below · standard not met in 2 of 4 years · nitrates in the groundwater nearby 26.9 mg/l3 indicators
  • OR Považská Bystricasite Považská Bystrica, above · standard not met in 1 of 4 years · nitrates in the groundwater nearby 24.5 mg/l3 indicators
  • Sklabinský potoksite Tomčany, bridge · standard not met in 1 of 4 years · nitrates in the groundwater nearby 28.0 mg/l3 indicators
  • VN Dolné Dubovésite Dolné Dubové · standard not met in 3 of 4 years · nitrates in the groundwater nearby 0.5 mg/l2 indicators
  • Podhradský potoksite Košecké Podrhadie, below · standard not met in 2 of 4 years · nitrates in the groundwater nearby 13.7 mg/l2 indicators
  • Pružinka č. 1site Visolaje · standard not met in 2 of 4 years · nitrates in the groundwater nearby 13.7 mg/l2 indicators
  • Pružinka č. 2site Visolaje · standard not met in 2 of 4 years · nitrates in the groundwater nearby 13.7 mg/l2 indicators
  • VN Bábsite Bábsky, below the Báb Reservoir · standard not met in 2 of 4 years · nitrates in the groundwater nearby 0.5 mg/l2 indicators
  • VN Suchá nad Parnousite Suchá nad Parnou · standard not met in 2 of 4 years · nitrates in the groundwater nearby 24.1 mg/l2 indicators
  • Biela Voda č. 1 (Púchov)site Vieska – Bezdedov · standard not met in 1 of 4 years · nitrates in the groundwater nearby 24.5 mg/l2 indicators
  • Biela Voda č. 2 (Púchov)site Vieska – Bezdedov · standard not met in 1 of 4 years · nitrates in the groundwater nearby 13.7 mg/l2 indicators
  • Kostolníksite Kostolné · standard not met in 1 of 4 years · nitrates in the groundwater nearby 12.7 mg/l2 indicators
  • Lednicasite Lednica, mouth, above · standard not met in 1 of 4 years · nitrates in the groundwater nearby 13.7 mg/l2 indicators
  • Modrovský potoksite Modrová, above · standard not met in 1 of 4 years · nitrates in the groundwater nearby 4.5 mg/l2 indicators
  • Parná č. 2site Horné Orešany · standard not met in 1 of 4 years · nitrates in the groundwater nearby 24.1 mg/l2 indicators
  • Parná č. 3site Horné Orešany · standard not met in 1 of 4 years · nitrates in the groundwater nearby 24.1 mg/l2 indicators
  • Porubský potoksite Konská · standard not met in 1 of 4 years · nitrates in the groundwater nearby 5.1 mg/l2 indicators
  • Porubský potok (Žilina)site Konská · standard not met in 1 of 4 years · nitrates in the groundwater nearby 5.1 mg/l2 indicators
  • Turiec č. 1a (Martin)site Turiec, above Martin, Košťany nad Turcom · standard not met in 1 of 4 years · nitrates in the groundwater nearby 28.0 mg/l2 indicators

Showing 40 of 132 fishing districts, worst first.

What most often fails

Number of sites in the river basin that failed this indicator in 2025

  1. benzo(a)pyrenePAHs (combustion and deposition)34
  2. fluoranthenePAHs (combustion and deposition)18
  3. pHSalts, pH and minerals9
  4. perylenePAHs (combustion and deposition)9
  5. total phosphorusNutrients and nitrogen9
  6. COD (chemical oxygen demand)Oxygen and organic matter7
  7. benzo(b)fluoranthenePAHs (combustion and deposition)6
  8. AOX (adsorbable organic halogens)Harmful organic substances6
  9. nitritesNutrients and nitrogen6
  10. conductivitySalts, pH and minerals6
  11. BOD₅ (biochemical oxygen demand)Oxygen and organic matter6
  12. ammoniumNutrients and nitrogen5
  • 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 districts) and 22% have no location at all, so we do not assign them to any district. We determine the distance, the match of the watercourse name and the ranking ourselves; the assignment is indicative.