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How we read the analyses

No black box: here is exactly where the numbers come from and how they become a grade.

From raw data to information you can actually use

  1. 1

    We fetch the official analyses

    For tap water, the Hub'Eau platform run by the French Ministry of Health. For bathing water, the European Environment Agency database, fed by all 27 member states. The same data the authorities use.

  2. 2

    We compare them to the legal limits

    Nitrates, pesticides, PFAS, lead, bacteriology: every parameter is measured against its regulatory limit. Nothing invented, nothing weighted to suit us.

  3. 3

    We turn it into a score and plain words

    A grade, a colour, an explanation. You decide with full knowledge, without having to interpret a laboratory table.

The Akvido scale, A to E

  • A
    Compliant, excellent

    All regulatory parameters met, with comfortable margin.

  • B
    Compliant, good

    All parameters met, some values approaching a limit.

  • C
    Worth watching

    Compliance met but one or more values deserve attention.

  • D
    Limits approached

    Parameters close to regulatory thresholds across several samples.

  • E
    Exceedance recorded

    At least one parameter beyond its regulatory limit.

The main regulatory limits

PFAS, sum of 20 substances 0.10 µg/L In force since 12 January 2026
Nitrates 50 mg/L Water intended for human consumption
Pesticides, per substance 0.10 µg/L 0.50 µg/L for the total
Lead 10 µg/L At the consumer's tap

Our sources, in the open

  • Hub'Eau — drinking water health monitoring French Ministry of Health and Biodiversity Office France, all municipalities
  • European Environment Agency — bathing waters European Directive 2006/7/EC 22,289 sites, member and associated states
  • Hub'Eau — river water quality French Biodiversity Office France, rivers and water bodies
  • Administrative boundaries API Etalab French municipality reference data

A note on how fresh the data is

The European bathing classification is annual: it summarises a whole season, computed over four years of sampling. French tap water analyses are published with a delay of a few weeks to a few months. We always display the sampling date, so you always know how old what you are reading is.