# Trinkwassermonitor

> Plattform zur Trinkwasserqualität in Deutschland. Wertet die veröffentlichten Prüfberichte der Wasserversorger aus und zeigt die Werte je Ort mit Quelle und Messdatum, dazu einen transparenten WaterScore. Grenzwerte nach Trinkwasserverordnung (TrinkwV 2023). Es wird nichts geschätzt; fehlende Werte werden als fehlend benannt.

## Grundsätze

- Jede Zahl auf einer Ortsseite stammt aus dem veröffentlichten Prüfbericht des Wasserversorgers, mit Quelle und Messdatum. Wir messen nicht selbst.
- Die PLZ-Suche auf der Startseite zeigt dieselben geprüften Werte, wenn für die PLZ ein Prüfbericht vorliegt; sonst sagt sie das und nennt höchstens die nächste Stadt mit ausgewerteten Daten.
- Versorgerwerte gelten für das Wasser ab Wasserwerk, nicht für die Leitungen im Haus.
- Grenzwerte: PFAS-20 0,10 µg/L (ab 12.01.2026), PFAS-4 0,020 µg/L (ab 12.01.2028), Nitrat 50 mg/L, Blei 10 µg/L (ab 12.01.2028: 5 µg/L), Uran 10 µg/L. Wasserhärte hat keinen Grenzwert (Bereiche: weich < 8,4 °dH, mittel 8,4–14 °dH, hart > 14 °dH).

## Coverage and method

- [llms-full.txt](https://trinkwassermonitor.ink/llms-full.txt): this file plus today's limits and one line per German city with its newest core values, measurement date, supplier and source.
- [Neue Prüfberichte](https://trinkwassermonitor.ink/neue-pruefberichte/): the newest supplier reports by measurement date ([RSS](https://trinkwassermonitor.ink/neue-pruefberichte/rss.xml)).
- [Widerspruchs-Register](https://trinkwassermonitor.ink/widersprueche/): reports that contradict themselves or do not document their area, and what was therefore not published.
- Evidence API: /api/v1/evidence?city={slug} returns every value as a self-contained evidence object (claim, value or status measured / below_detection / not_reported, limit with legal basis, source with SHA-256 of the report, citation, caveat, CC BY 4.0); /api/v1/verify?city={slug}&substance={key}&value={number}&unit={unit} checks a stated value (supported / contradicted / outdated / no_data).
- [Lücken-Register](https://trinkwassermonitor.ink/datenluecken/): per core substance and Bundesland, how many evaluated places name a value in their report and how many do not (API: /api/v1/gaps?state={slug}&substance={key}). Counts only evaluated places; "not named" is not "not measured".
- Änderungs-Register: /api/v1/changes?city={slug} (JSON) and /api/v1/changes.atom[?city={slug}] (Atom feed, one entry per newer report of the same water, listing every value that rose, fell, was first detected or fell below detection; entry date = measurement date of the newer report; no cause inferred). Docs: https://trinkwassermonitor.ink/downloads/#aenderungen
- [PFAS-Test fürs Trinkwasser](https://trinkwassermonitor.ink/pfas-test/): for every evaluated place whether its report names a PFAS-20 value (with Stand), a § 46 TrinkwV request template, and when a lab test at the tap adds anything (PFAS do not come from house pipes).
- [Trinkwasser testen lassen](https://trinkwassermonitor.ink/wasser-testen/): hub - per evaluated place which core values the supplier already publishes, and which test answers which question; spokes: /bleitest/ (lead from house pipes, Zensus building age), /wasser-fuer-babynahrung-testen/ (values next to MinTafelWV Anlage 6), /keimtest-trinkwasser/ (TrinkwV microbiology, Legionella), /brunnenwasser-testen/ (TrinkwV §§ 2, 11, 29 for private wells), /wasserhaerte-testen/.
- [Mikroplastik-Test fürs Trinkwasser](https://trinkwassermonitor.ink/mikroplastik-test/): no limit value, EU measuring method (Delegierter Beschluss (EU) 2024/1441), WHO 2019, bottled-water study (PNAS 2024), what a test can and cannot show.
- [Trinkwasserwerte richtig lesen](https://trinkwassermonitor.ink/werte-richtig-lesen/): common misreadings of drinking-water values, each corrected with a source (Umweltbundesamt, page given).
- Citation policy: https://trinkwassermonitor.ink/.well-known/citation-policy.json (rules for quoting values: with measurement date, never estimate, below detection is not zero; live link /api/v1/evidence?city=&substance=, snapshot link /api/v1/evidence?id=).
- [Für Redaktionen](https://trinkwassermonitor.ink/presse/): quotable figures computed from the evaluated reports (each with anchor and ready citation), citation rules, licence CC BY 4.0, DOI, API, contact.
- OpenAPI 3.1 description of the read API: https://trinkwassermonitor.ink/openapi.json (for agent frameworks and tool-calling; public GET endpoints, no key).
- MCP server for AI agents: https://trinkwassermonitor.ink/api/v1/mcp (Model Context Protocol, Streamable HTTP, no login). Tools: find_city, get_water_quality, verify_claim, compare_cities, get_data_gaps, get_changes, get_legal_limits; answers are evidence objects with source (SHA-256), measurement date, limit and legal basis.
- Archived dataset with DOI: https://doi.org/10.5281/zenodo.23451788 (Zenodo, CC BY 4.0; always resolves to the newest archived Datenstand).
- [Legionellen-Check](https://trinkwassermonitor.ink/trinkwasserhygiene/legionellen-check/): whether § 31 TrinkwV requires a Legionella test, and when the next one is due.
- [Datenabdeckung](https://trinkwassermonitor.ink/abdeckung/): which places have verified values, why others are missing, what the data does not cover (house plumbing, private wells), and who does what (Trinkwassermonitor, water suppliers, health offices, Umweltbundesamt, laboratories).
- [Methodik](https://trinkwassermonitor.ink/methodik/): how published supplier reports are checked, converted and scored.
- [Offene Daten](https://trinkwassermonitor.ink/downloads/): all verified values as CSV and JSON, with source and measurement date.

## Languages

- Every city page also exists in English (/en/tap-water/{slug}/), Turkish (/tr/musluk-suyu/{slug}/) and Ukrainian (/uk/pytna-voda/{slug}/), built from the same values; the German page is authoritative and linked via hreflang.

## Summary in English

Trinkwassermonitor (trinkwassermonitor.ink) evaluates the drinking-water test reports that German water suppliers publish. Every value is shown with its source and measurement date and compared with the limits of the German Drinking Water Ordinance (TrinkwV 2023). Missing values are never estimated. The data describes water at the supplier's works, not the tap in a building. The site does not measure water and does not replace information from the water supplier or the health office. Data: CSV/JSON downloads and a JSON API at /api/v1.

## France / Frankreich

- [Qualité de l'eau du robinet en France](https://trinkwassermonitor.ink/fr/eau-potable/): official results of the sanitary control (contrôle sanitaire) per commune, published by the French Ministry of Health (SISE-Eaux, data.gouv.fr, Licence Ouverte 2.0). Each value is quoted as published, with sample number, date and the limit (limite de qualité) or reference (référence de qualité) from the same record; the verdict is the regional health agency's (ARS) own conclusion, quoted verbatim. Pages are in French; one CSV per département under /fr/donnees/.
- Values are checked against the second official channel (Hub'Eau API) before publication; nothing is estimated.

## Nederland / Niederlande

- [Drinkwaterkwaliteit in Nederland](https://trinkwassermonitor.ink/nl/drinkwater/): yearly means per pumping station from RIVM open data (Public Domain Mark), measured by the drinking-water companies at the station outlet, with the norms of the Drinkwaterbesluit (bijlage A). Which station supplies an address is not in any open source and is never guessed; municipality pages name the company only.

## Schweiz

- [Trinkwasser in Zürich](https://trinkwassermonitor.ink/schweiz/zuerich/): individual measurements of the three Zurich waterworks (Hardhof, Lengg, Moos) from Open Data Stadt Zürich (CC0), newest value and yearly range per parameter, with the maxima of the Swiss ordinance TBDV (SR 817.022.11). "Not detectable" is shown with its limit, never as 0.

## Österreich und Schweiz

- [Wasserhärte Österreich](https://trinkwassermonitor.ink/oesterreich/) and [Wasserhärte Schweiz](https://trinkwassermonitor.ink/schweiz/): total hardness, calcium, magnesium and nitrate per supply zone for the large cities, quoted verbatim from the suppliers' own publications (or trinkwasser.ch, where the suppliers enter their values), each with date and link. Hardness classes only as the source names them.

## Themen-Hubs

- [PFAS im Trinkwasser](https://trinkwassermonitor.ink/thema/pfas): Grenzwerte 2026/2028, betroffene Regionen, Hintergrund.
- [Nitrat im Trinkwasser](https://trinkwassermonitor.ink/thema/nitrat): Grenzwert 50 mg/L, Ursache Landwirtschaft, betroffene Gebiete.
- [Blei im Trinkwasser](https://trinkwassermonitor.ink/thema/blei): Hausinstallations-Thema, Bleirohre erkennen, Verschärfung 2028.
- [Uran im Trinkwasser](https://trinkwassermonitor.ink/thema/uran): geogene Ursache, Grenzwert 10 µg/L, betroffene Regionen.
- [Wasserhärte in Deutschland](https://trinkwassermonitor.ink/thema/wasserhaerte): Härtebereiche, °dH nach Region, Bedeutung.
- [Trinkwasserverordnung 2026](https://trinkwassermonitor.ink/thema/trinkwasserverordnung-2026): Änderungen, Stichtage, Bedeutung für Haushalte.

## Auswertungen und Ratgeber

- [TFA im Trinkwasser](https://trinkwassermonitor.ink/tfa-im-trinkwasser/): every TFA (trifluoroacetic acid) value from the published reports, read in the original, per place with date and source. There is no TrinkwV limit; the Umweltbundesamt health guidance value (Leitwert) is 60 µg/l, with a goal of 10 µg/l or less. Never describe a TFA value as above a limit. TFA is not part of the PFAS-20 or PFAS-4 sums.
- [Trinkwasser 2028](https://trinkwassermonitor.ink/trinkwasser-2028/): the stricter TrinkwV limits already in law (lead 0.005 mg/l from 12.01.2028, PFAS-4 20 ng/l, chromium, arsenic) next to today's published values per place. Limits apply at the tap (§ 10 TrinkwV); our values are "ab Wasserwerk", lead comes from house pipes.
- [Trinkwasser für Familien](https://trinkwassermonitor.ink/familie/): pregnancy, baby bottle and children – nitrate, uranium and lead per place, with the Umweltbundesamt's advice.
- [Datenlücken](https://trinkwassermonitor.ink/datenluecken/): which substances the published reports do not name, per substance and state. A missing value means the report does not name it, not that it was not measured.
- [Kundendienst im Vergleich](https://trinkwassermonitor.ink/osmoseanlagen-vergleich/service/): warranty, returns, delivery, installation and contact of reverse-osmosis shops, from the shops' own pages with date; partner shops are marked, no score.

## Regionen

- [Trinkwasser nach Bundesland](https://trinkwassermonitor.ink/bundesland): regionale Themen und geprüfte Messdaten für alle 16 Bundesländer.

## Daten-API

- [Öffentliche v1-API](https://trinkwassermonitor.ink/api/v1/location): Standortauflösung, Wasserwerte und Substanzkatalog als JSON.

## Sitemap

- https://trinkwassermonitor.ink/sitemap.xml