Short answer. Most Slovaks (88.3% in 2015) drink water from public supplies, which suppliers and public health authorities monitor 1. If tap water becomes unsafe, the ban comes locally: Phaenyx found no national register of boil-water or do-not-drink notices. The Interior Ministry advises 3-5 litres of drinking water per person per day 2. Private well owners must check their own water 1.
How do I know if my tap water is unsafe?
Public water supplies are run by qualified operators, mainly large water companies and municipalities, who are responsible for the quality of drinking water and its control 1. Public health authorities also run their own monitoring to check that quality 1.
When a supply is contaminated, use of the public tap water can be banned. In 2015, well water contaminated the public supply in Horné and Dolné Saliby; the ban on using the tap water, the replacement supply and the clean-up lasted 10 days 1. Municipalities coordinate essential services in an emergency, including the supply of drinking water 2.
Phaenyx found no national register of these bans for Slovakia. Expect the notice from your municipality, your water company or your regional public health office (RÚVZ), which gives information on drinking water free of charge 1. If you are unsure about water quality, boil it 2. How official warnings reach you is explained on our Slovakia alerts page. See What to do during a boil-water notice and Do-not-drink notices.
How much water should I store?
The Interior Ministry advises 3-5 litres of drinking water per person per day, water for pets too, and extra water stored in well-cleaned bottles, cans or other containers in a dark, cool place 2. For a long power outage, it recommends drinks and food for every household member for at least 14 days, with at least 4 litres of water per person per day: 2 for drinking and 2 for cooking and hygiene 2. Plan how you will use the toilet if water is cut for several days 2.
Full figures are on our Slovakia emergency supplies page. See also How much water to store per person per day? and Water storage containers.
Is Slovakia short of water?
Not on average. In WRI's Aqueduct 4.0 model, the population-weighted median of Slovak cities is "low to medium" for water stress today and in the 2050 business-as-usual projection, and "medium-high" for drought risk, on Aqueduct's separate drought scale 4. These are city medians: a given town can sit higher or lower.
The national weather and hydrology institute, SHMÚ, monitors meteorological, hydrological and soil drought 3. Phaenyx found no national page listing current water-use restrictions. See Drought preparedness.
What if I have a private well?
Owners of wells serving their own household are responsible for them 1. The public health authority's December 2017 leaflet says only a test in an accredited laboratory can confirm that well water is safe; clear water with a good taste is no guarantee 1. It recommends tests once or twice a year, in different seasons, and extra tests after floods, repairs or cleaning, or whenever taste, colour or smell changes 1.
Nitrates and nitrites are the most common problem 1. In free tests offered on World Water Day from 2013 to 2017, between 19.3% and 38.1% of well samples each year exceeded the nitrate limit 1. Boiling does not remove nitrates; it concentrates them 1. Floods are among the most frequent causes of microbial contamination of wells 1. See Private well emergencies.
What should I do after a flood?
Have your well water tested before drinking it again 1, and follow the instructions of your municipality or water company. See Water safety after a flood. A household plan can keep your water stock, local contacts and warning channels in one place.
Frequently asked questions
Who checks tap water in Slovakia?
Water suppliers are responsible for quality and its control, and public health authorities run their own monitoring 1.
Can I boil well water that contains nitrates?
No. Boiling raises the nitrate concentration; only a suitable treatment device removes it 1.
How much water for a long blackout?
At least 4 litres per person per day, with drinks and food for at least 14 days 2.
Where can I ask about my drinking water?
Your regional public health office (RÚVZ) gives information on drinking water free of charge 1.
Sources
- Úrad verejného zdravotníctva Slovenskej republiky (ÚVZ SR), Národné referenčné centrum pre pitnú vodu — Zdravá pitná voda z vlastnej studne – informácia pre verejnosť (December 2017, ISBN 978-80-7159-231-0; Wayback Machine copy of 28 March 2018) — https://web.archive.org/web/20180328175703/http://www.uvzsr.sk/docs/info/pitna/Priloha_c_2_Zdrava_pitna_voda_z_vlastnej_studne.pdf (accessed 2026-10-27)
- Ministerstvo vnútra Slovenskej republiky, Sekcia krízového riadenia — Čo robiť v prípade krízy alebo ozbrojeného konfliktu — https://www.minv.sk/?co-robit-v-pripade-krizy-alebo-ozbrojeneho-konfliktu (accessed 2026-10-27)
- Slovenský hydrometeorologický ústav (SHMÚ) — Meteorologické sucho — https://www.shmu.sk/sk/?page=1&id=meteo_sucho (accessed 2026-10-27)
- World Resources Institute (WRI) — Aqueduct 4.0 (water stress, 2050 projection and drought risk) — https://www.wri.org/aqueduct (accessed 2026-10-27)
Turn this into action
Your plan for Slovakia, worked out for your household.
- Water, food and equipment counted for each person and pet
- The nuclear plants and zones around your home
- Phaenyx Safe: one tap to tell your people you are safe
Sources
- Úrad verejného zdravotníctva Slovenskej republiky (ÚVZ SR), Národné referenčné centrum pre pitnú vodu · Zdravá pitná voda z vlastnej studne – informácia pre verejnosť (December 2017, ISBN 978-80-7159-231-0; Wayback Machine copy of 28 March 2018) checked 2026-10-27
- Ministerstvo vnútra Slovenskej republiky, Sekcia krízového riadenia · Čo robiť v prípade krízy alebo ozbrojeného konfliktu checked 2026-10-27
- Slovenský hydrometeorologický ústav (SHMÚ) · Meteorologické sucho checked 2026-10-27
- World Resources Institute (WRI) · Aqueduct 4.0 (water stress, 2050 projection and drought risk) checked 2026-10-27