Insights
Warsaw water hardness by area
Medium-hard tap water is normal across most of Warsaw. Use this English °dH table to understand scale risk for kettles, aerators, and combi boilers.
Last reviewed: Next review: Source: MPWiK — water hardness (twardość wody)Download CSV
Official hardness figures are published by MPWiK (twardość wody). We curate approximate bands in English for expats. Values change — always check the official table for your exact supply zone.
Hardness table (°dH)
| Area | Plant / zone | Typical °dH | Scale | Notes |
|---|---|---|---|---|
| Central Warsaw (Filtry / Praga plants) | Zakład Uzdatniania Wody Filtry / Praga | ~13.5–16 °dH | Medium | Serves much of Śródmieście, Mokotów, Ochota, Wola — typical city-centre supply. |
| Northern Warsaw | Zakład Uzdatniania Wody Północ | ~14–15.5 °dH | Medium | Common for Bielany, Żoliborz, and northern estates. |
| Wesoła | Local stations (Wesoła) | ~16–20 °dH | Medium–hard | Among the higher published averages — expect faster limescale on kettles and aerators. |
| Wawer (Radość / Falenica) | Local stations (Wawer) | ~12–16 °dH | Medium | Varies by local station; check MPWiK for your exact supply zone. |
| Ursynów / Wilanów (typical city supply) | Fed from central / southern network | ~13.5–16.5 °dH | Medium | Combi boilers and mixer showers show scale wear; cleaning aerators helps. |
| Praga-Północ / Praga-Południe | Praga plant / network | ~13.5–16 °dH | Medium | Similar to central Warsaw; older flats may also have local pipe sediment. |
What °dH means for your flat
°dH (German degrees) is the scale MPWiK uses. “Medium” still produces visible limescale on kettles and chrome over months. Harder bands (e.g. parts of Wesoła) clog shower aerators and stress combi heat exchangers faster.
- Clean tap aerators regularly — see low water pressure.
- Scale and dripping mixers often travel together — hard water guide.
- Filters improve taste and reduce sediment at one tap — filter options or whole home filtration.
- Drinking safety is a separate question — is tap water safe?and our quality parameters table.
- Search by district name — water by district map— or get appliance settings from the hardness finder.
Download
Download CSV — free for personal use; cite Warsaw Home Help and MPWiK as sources. Dataset schema on this page points to the same file.