PFAS in Oslo's tap water: no test result published yet
Figures: annual values · Source: Mattilsynet
No PFAS result for Oslo yet, we notify you when one is published
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PFAS in drinking water
PFAS-4 is not published for this supply area
More about this result
No PFAS result is published for Oslo in the data retrieved on 28 September 2026 (Mattilsynet, Vannverk (vannforsyningssystem_analyse)). PFAS testing of drinking water has been mandatory across the EU since January 2026. The latest published check dates from 31 December 2025.
The four EFSA compounds (PFOA, PFOS, PFNA, PFHxS) are not reported separately, so the 4 ng/L health benchmark and this site's 0.5 ng/L benchmark cannot be checked.
Sum-4 PFAS at 4 ng/L applies since 1 January 2026; analysis is mandatory only where the hazard assessment shows PFAS may occur; first annual figures are due 15 February 2027.
- Latest water check
- 31 December 2025
- Water supplier
- Oslo Kommune
No PFAS result is published for Oslo in the data retrieved on 28 September 2026 (Mattilsynet, Vannverk (vannforsyningssystem_analyse)). PFAS testing of drinking water has been mandatory across the EU since January 2026. The latest published check dates from 31 December 2025.
Details and sources
What the latest check found
The authorities have not published an overall verdict for this water.
Values to watch
These results are close to their legal limit, or over it.
In 2025, at least one sample fell outside the limit for Lead 21.2 µg/L (limit ≤ 10 µg/L), Coliform bacteria 800 n/(100mL) (limit ≤ 0 n/(100mL)), Clostridium perfringens 1 n/(100mL) (limit ≤ 0 n/(100mL)), Colony count at 22 °C 300 n/mL (limit ≤ 100 n/mL), Iron 0.47 mg/L (limit ≤ 0.2 mg/L), Manganese 0.0767 mg/L (limit ≤ 0.05 mg/L), Aluminium 0.352 mg/L (limit ≤ 0.2 mg/L). The annual medians were within every limit.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Lead · maximum 2025 | 21.2 µg/L | ≤ 10 µg/L | over the limit |
| Coliform bacteria · maximum 2025 | 800 n/(100mL) | ≤ 0 n/(100mL) | over the limit |
| Clostridium perfringens · maximum 2025 | 1 n/(100mL) | ≤ 0 n/(100mL) | over the limit |
| Colony count at 22 °C · maximum 2025 | 300 n/mL | ≤ 100 n/mL | over the limit |
| Iron · maximum 2025 | 0.47 mg/L | ≤ 0.2 mg/L | over the limit |
| Manganese · maximum 2025 | 0.0767 mg/L | ≤ 0.05 mg/L | over the limit |
| Aluminium · maximum 2025 | 0.352 mg/L | ≤ 0.2 mg/L | over the limit |
See all 51 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate · median 2025 | 0.155 mg/L | ≤ 50 mg/L | within the limit |
| Nitrate · maximum 2025 | 0.204 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite · median 2025 | 0.155 mg/L | ≤ 0.5 mg/L | within the limit |
| Nitrite · maximum 2025 | 0.204 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead · median 2025 | 0.07 µg/L | ≤ 10 µg/L | within the limit |
| Lead · maximum 2025 | 21.2 µg/L | ≤ 10 µg/L | over the limit |
| Copper · median 2025 | 0.0009 mg/L | ≤ 2 mg/L | within the limit |
| Copper · maximum 2025 | 0.0396 mg/L | ≤ 2 mg/L | within the limit |
| Nickel · median 2024 | 0.172 µg/L | ≤ 20 µg/L | within the limit |
| Nickel · maximum 2024 | 0.477 µg/L | ≤ 20 µg/L | within the limit |
| Cadmium · median 2025 | 0.01 µg/L | ≤ 5 µg/L | within the limit |
| Cadmium · maximum 2025 | 0.08 µg/L | ≤ 5 µg/L | within the limit |
| Fluoride · median 2025 | 0.05 mg/L | ≤ 1.5 mg/L | within the limit |
| Fluoride · maximum 2025 | 0.05 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli · median 2025 | 0 n/(100mL) | ≤ 0 n/(100mL) | within the limit |
| Escherichia coli · maximum 2025 | 0 n/(100mL) | ≤ 0 n/(100mL) | within the limit |
| Enterococci · median 2025 | 0 n/(100mL) | ≤ 0 n/(100mL) | within the limit |
| Enterococci · maximum 2025 | 0 n/(100mL) | ≤ 0 n/(100mL) | within the limit |
| Coliform bacteria · median 2025 | 0 n/(100mL) | ≤ 0 n/(100mL) | within the limit |
| Coliform bacteria · maximum 2025 | 800 n/(100mL) | ≤ 0 n/(100mL) | over the limit |
| Clostridium perfringens · median 2025 | 0 n/(100mL) | ≤ 0 n/(100mL) | within the limit |
| Clostridium perfringens · maximum 2025 | 1 n/(100mL) | ≤ 0 n/(100mL) | over the limit |
| Colony count at 22 °C · median 2025 | 3 n/mL | ≤ 100 n/mL | within the limit |
| Colony count at 22 °C · maximum 2025 | 300 n/mL | ≤ 100 n/mL | over the limit |
| pH · median 2025 | 7.63 pH | 6.5–9.5 pH | within the limit |
| pH · maximum 2025 | 7.98 pH | 6.5–9.5 pH | within the limit |
| pH · minimum 2025 | 7.26 pH | 6.5–9.5 pH | within the limit |
| Water hardness · median 2025 | 2.4 °dH | no limit | for reference |
| Water hardness · maximum 2025 | 2.95 °dH | no limit | for reference |
| Electrical conductivity · median 2025 | 10.4 mS/m | ≤ 250 mS/m | within the limit |
| Electrical conductivity · maximum 2025 | 11.8 mS/m | ≤ 250 mS/m | within the limit |
| Chloride · median 2025 | 3.57 mg/L | ≤ 250 mg/L | within the limit |
| Chloride · maximum 2025 | 9.5 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate · median 2025 | 3.19 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate · maximum 2025 | 12.2 mg/L | ≤ 250 mg/L | within the limit |
| Sodium · median 2024 | 1.98 mg/L | ≤ 200 mg/L | within the limit |
| Sodium · maximum 2024 | 2.59 mg/L | ≤ 200 mg/L | within the limit |
| Iron · median 2025 | 0.0036 mg/L | ≤ 0.2 mg/L | within the limit |
| Iron · maximum 2025 | 0.47 mg/L | ≤ 0.2 mg/L | over the limit |
| Turbidity · median 2025 | 0.16 FNU | no limit | for reference |
| Turbidity · maximum 2025 | 3.34 FNU | no limit | for reference |
| Manganese · median 2025 | 0.0015 mg/L | ≤ 0.05 mg/L | within the limit |
| Manganese · maximum 2025 | 0.0767 mg/L | ≤ 0.05 mg/L | over the limit |
| Aluminium · median 2025 | 0.0411 mg/L | ≤ 0.2 mg/L | within the limit |
| Aluminium · maximum 2025 | 0.352 mg/L | ≤ 0.2 mg/L | over the limit |
| Ammonium · median 2024 | 0.007 mg/L | ≤ 0.5 mg/L | within the limit |
| Ammonium · maximum 2024 | 0.01 mg/L | ≤ 0.5 mg/L | within the limit |
| Colour · median 2025 | 4 mg Pt/L | no limit | for reference |
| Colour · maximum 2025 | 6 mg Pt/L | no limit | for reference |
| Calcium · median 2025 | 16.6 mg/L | no limit | for reference |
| Calcium · maximum 2025 | 20.3 mg/L | no limit | for reference |
Frequently asked questions
Is tap water in Oslo safe to drink?
The authorities have not published an overall verdict for this water. In 2025, at least one sample fell outside the limit for Lead 21.2 µg/L (limit ≤ 10 µg/L), Coliform bacteria 800 n/(100mL) (limit ≤ 0 n/(100mL)), Clostridium perfringens 1 n/(100mL) (limit ≤ 0 n/(100mL)), Colony count at 22 °C 300 n/mL (limit ≤ 100 n/mL), Iron 0.47 mg/L (limit ≤ 0.2 mg/L), Manganese 0.0767 mg/L (limit ≤ 0.05 mg/L), Aluminium 0.352 mg/L (limit ≤ 0.2 mg/L). The annual medians were within every limit. The four EFSA compounds (PFAS-4) are not itemised, so this water cannot be compared with the 0.5 ng/L health benchmark used by pfasnearme.
How high are PFAS levels in Oslo's drinking water?
No PFAS results have been published for Oslo yet. Testing has been required across the EU since January 2026. We will show the values here as soon as they come out.
Which PFAS limits apply in Norway?
Norway's drikkevannsforskriften, vedlegg 1, sets "Sum 4 PFAS" (PFOA, PFOS, PFNA, PFHxS) at 0.004 µg/l, that is 4 ng/L, added by forskrift 2025-12-19-2728 and in force since 1 January 2026; waterworks report their annual figures by 15 February of the following year. The regulation contains no limit for the sum of 20 PFAS today. This site's 0.5 ng/L benchmark is stricter than the Norwegian limit.
How hard is the water in Oslo?
The water hardness in Oslo is 2.4 °dH (soft). This mainly matters for household appliances and detergent dosing, not for health.
Where does this data come from?
All values come from official publications: Mattilsynet, Vannverk (vannforsyningssystem_analyse). Retrieved on 28 September 2026.
Nearby cities
The closest to Oslo on this site.
Data source
- Mattilsynet, Vannverk (vannforsyningssystem_analyse)
- https://data.norge.no/nb/datasets/0af4536d-baa9-35b9-a541-b3fe2c14f58a/vannverk-vannforsyningssystemanalyse
- License
- NLOD 2.0
- Retrieved
- 28 September 2026
- Supply networks
- Vann- Og Avløpsetaten (758 643 fastboende), Kobberhaughytta Vannforsyning (2 fastboende), Maridalen Skole Vannforsyning (1 fastboende), Fondsbu Turisthytte - Vannforsyning, Grunnvannskilde Grefsenkollen, Leirvassbu - Vannforsyningssystem, Skjennungstua Vannforsyning, Trysil Knut Panorama Vannverk
Årstall fra Mattilsynets vannverksregister (data per 2026-09-27, uttrekk 28.09.2026 02:11). Verdiene er median og høyeste målte verdi for 2025 i drikkevannet fra Vann- Og Avløpsetaten (758 643 fastboende), det største av kommunens 8 aktive vannforsyningssystemer med analyser for 2025 eller 2024; de øvrige er listet under vannforsyningssystemer. Antall prøver bak hvert tall varierer. Enheter er ikke oppgitt i uttrekket og følger Mattilsynets feltbeskrivelse og drikkevannsforskriften vedlegg 1; "overskridelse" betyr at minst én prøve i 2025 overskred grenseverdien (ant_avvik).
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.