PFAS in Tienen's tap water: none of the four main PFAS detected
PFAS figure: annual value · Source: VMM
PFAS in drinking water
not precise enough to compare
Some of the four PFAS were too small for the lab to measure. The check cannot say whether this water is above or below our benchmark of 0.5 ng/L.
0.5 ng/L is our benchmark, not an official limit. Same EFSA method as Sweden, Denmark and the Netherlands, but stricter. It's a yearly average, compared here with the latest check.
The PFAS figures are the 2024 annual median for supply area LG24_MO28, the area with the highest PFAS-4 median among the 4 areas serving Tienen. The page leads with the median, the typical value in the network. The highest single PFAS-4 measurement in that area in 2024 was 7 ng/L.
More about this result
The US also limits PFOA and PFOS to 4 ng/L each, per substance.
Substances below the detection limit count as 0, so the real total may be higher.
checked on 31 December 2024
The test cannot say if the water is above or below our 0.5 ng/L benchmark.
Water report for Tienen
Get new PFAS results for Tienen, with a short explanation. At most one update a week, only when there's something new.
- Legal limit (Belgium and EU)
- none detected sum of 20 PFAS below the detection limit, limit 100 ng/L
- Reporting year
- 2024 annual median in the supply area
- Water supplier
- De Watergroep
In Tienen, none of the 4 most closely watched PFAS (PFAS-4) was found in a measurable amount at the annual figure (median in the network) on 31 December 2024. That's below the detection limit, so there's no verdict against our 0.5 ng/L benchmark. Sum of 20 PFAS: not detected, below the EU legal limit (100 ng/L). Source: Vlaamse Milieumaatschappij (VMM) – Kwaliteit van het drinkwater 2024, bijlage 2.
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.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate · median 2024 · LG24_MO22 | 35 mg/l | ≤ 50 mg/l | within the limit |
See all 26 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| PFAS-4 (PFOA + PFOS + PFNA + PFHxS) · maximum 2024 · LG24_MO28 | 0.007 µg/L | ≤ 0.004 µg/L | above the 2028 target |
| Sum of 20 PFAS · maximum 2024 · LG24_MO28 | 0.008 µg/l | ≤ 0.1 µg/l | within the limit |
| PFAS total · median 2024 · LG24_MO21 | 0.001 µg/l | ≤ 0.5 µg/l | within the limit |
| PFAS total · maximum 2024 · LG24_MO21 | 0.002 µg/l | ≤ 0.5 µg/l | within the limit |
| Trifluoroacetic acid (TFA) · median 2024 · LG24_MO22 | 1.85 µg/l | ≤ 15.6 µg/l | within the limit |
| Trifluoroacetic acid (TFA) · maximum 2024 · LG24_MO22 | 2.5 µg/l | ≤ 15.6 µg/l | within the limit |
| Nitrate · median 2024 · LG24_MO22 | 35 mg/l | ≤ 50 mg/l | within the limit |
| Nitrite · median 2024 · LG24_MO20 | 0 mg/l | ≤ 0.5 mg/l | within the limit |
| Lead · median 2024 · LG24_MO20 | 0 µg/l | ≤ 10 µg/l | within the limit |
| Copper · median 2024 · LG24_MO20 | 0.0105 mg/l | ≤ 2 mg/l | within the limit |
| Nickel · median 2024 · LG24_MO22 | 2 µg/l | ≤ 20 µg/l | within the limit |
| Arsenic · median 2024 · LG24_MO20 | 0 µg/l | ≤ 10 µg/l | within the limit |
| Cadmium · median 2024 · LG24_MO22 | 0.1 µg/l | ≤ 5 µg/l | within the limit |
| Chromium · median 2024 · LG24_MO22 | 1 µg/l | ≤ 50 µg/l | within the limit |
| Uranium · median 2024 · LG24_MO22 | 1.3 µg/l | ≤ 30 µg/l | within the limit |
| Fluoride · median 2024 · LG24_MO20 | 0 mg/l | ≤ 1.5 mg/l | within the limit |
| Escherichia coli · median 2024 · LG24_MO20 | 0 /100 ml | ≤ 0 /100 ml | within the limit |
| Enterococci · median 2024 · LG24_MO22 | 0 /100 ml | ≤ 0 /100 ml | within the limit |
| Coliform bacteria · median 2024 · LG24_MO21 | 0 /100 ml | ≤ 0 /100 ml | within the limit |
| pH · median 2024 · LG24_MO28 | 7.805 | 6.5–9.2 | within the limit |
| Water hardness · median 2024 · LG24_MO22 | 49.265 Fr° | ≤ 67.5 Fr° | within the limit |
| Electrical conductivity · median 2024 · LG24_MO22 | 868 µS/cm | ≤ 2,100 µS/cm | within the limit |
| Chloride · median 2024 · LG24_MO22 | 52.72 mg/l | ≤ 250 mg/l | within the limit |
| Sulphate · median 2024 · LG24_MO22 | 102.82 mg/l | ≤ 250 mg/l | within the limit |
| Sodium · median 2024 · LG24_MO28 | 79 mg/l | ≤ 200 mg/l | within the limit |
| Iron · median 2024 · LG24_MO22 | 0 µg/l | ≤ 200 µg/l | within the limit |
Frequently asked questions
Is tap water in Tienen safe to drink?
All the values shown here (31 December 2024) are within the legal limits, but the authorities have not published an overall verdict for this water.
How high are PFAS levels in Tienen's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was reported as not detected; the laboratory did not state its reporting limit. The EU limit is 100 ng/L. (below the EU limit)
Does the water in Tienen also meet the strictest limits in Europe?
The check cannot say. None of the four compounds was quantified, and the source does not publish detection limits fine enough to compare their total with Sweden's legal limit of 4 ng/L in force since 2026.
Which PFAS limits apply in Belgium?
Belgium applies the EU limit of 100 ng/L for the sum of 20 PFAS as binding law (Flemish Drinkwaterbesluit of 2023, Walloon Code de l'eau since February 2025). For the four most harmful PFAS (PFAS-4) all three regions set a target of 4 ng/L that becomes binding in 2028. This site's 0.5 ng/L benchmark is stricter than both.
How hard is the water in Tienen?
The water hardness in Tienen is 49.3 Fr° (hard). This mainly matters for household appliances and detergent dosing, not for health.
Where does this data come from?
All values come from official publications: Vlaamse Milieumaatschappij (VMM) – Kwaliteit van het drinkwater 2024, bijlage 2. Retrieved on 28 September 2026.
Same water network
Same distribution network as Tienen, so in principle the same water.
Nearby cities
The closest to Tienen on this site.
Data source
- Vlaamse Milieumaatschappij (VMM) – Kwaliteit van het drinkwater 2024, bijlage 2
- https://vmm.vlaanderen.be/feiten-cijfers/water/drinkwater/kwaliteit-drinkwater-per-leveringsgebied
- License
- Modellicentie voor gratis hergebruik (Vlaamse overheid) – https://vmm.vlaanderen.be/disclaimer
- Retrieved
- 28 September 2026
- Supply networks
- LG24_MO20 (De Watergroep), LG24_MO21 (De Watergroep), LG24_MO22 (De Watergroep), LG24_MO28 (De Watergroep)
Flanders: Vlaamse Milieumaatschappij (VMM), drinking water quality 2024, one annual figure per supply area (median and maximum of the measurements in the network). Licence: free reuse with attribution (Flemish model licence). Next edition expected in October 2026.
Limits in Belgium. Belgium applies the EU limit of 100 ng/L for the sum of 20 PFAS as binding law (Flemish Drinkwaterbesluit of 2023, Walloon Code de l'eau since February 2025). For the four most harmful PFAS (PFAS-4) all three regions set a target of 4 ng/L that becomes binding in 2028. This site's 0.5 ng/L benchmark is stricter than both.
Jaarcijfers 2024 van de metingen in het distributienet per leveringsgebied (VMM). De getoonde waarde is de mediaan van 2024; het maximum staat als aparte waarde "Maximale concentratie". 0 = niet gedetecteerd (onder de rapportagegrens). De gemeente valt in 4 leveringsgebieden (LG24_MO20, LG24_MO21, LG24_MO22, LG24_MO28); de PFAS-cijfers komen uit leveringsgebied LG24_MO28, het gebied met de hoogste mediane PFAS-4-waarde.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.