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Trinkwassermonitor MCP server

Which MCP servers are Trinkwassermonitor's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

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Whose server it is
  • Registry nameink.trinkwassermonitor/trinkwasserverified in the MCP registry

The registry name sits under trinkwassermonitor.ink. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools7
  • Server calls itselftrinkwassermonitor
  • Server version1.2.0
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 279 ms.

Should an agent connect itConnect it
  • Its tools do every use case we checked: look up published tap water test results by postcode; compare PFAS and nitrate levels between towns.

Once connected

  • For "look up published tap water test results by postcode", the likely first call is find_city.
  • For "compare PFAS and nitrate levels between towns", the likely first call is find_city.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 7, the first on 2026-10-27
  • INITE MCP score96 of 100answers 100 · does the job 100 · definitions 83 · context 100 · connects 100
  • What an agent can do with it2 of 2 use cases
  • Answered100% of days7 of 7 daily checks
  • Median first answer398 ms
  • Space in an agent's context≈ 771 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 7 toolsdeclared outputSchema: results come typed, read once
  • Not saying whether it only reads or can destroy: 7 of 7

What an agent can do with it

  • can do · look up published tap water test results by postcode
  • can do · compare PFAS and nitrate levels between towns
  • not sure · check whether a water filter suits local hardness

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers7 tools · read 2026-10-27
  • find_city

    Sucht Orte mit ausgewertetem Prüfbericht nach Name oder fünfstelliger Postleitzahl. Liefert slug, Name und PLZ für die anderen Tools.

  • get_water_quality

    Alle Werte des neuesten Prüfberichts eines Ortes (je Versorgungszone) als Beleg-Objekte: Wert oder Status (measured, below_detection, not_reported), Einheit, Messdatum, Grenzwert mit Rechtsgrundlage, Quelle mit SHA-256, fertiger Zitiersatz.

  • verify_claim

    Prüft eine Aussage wie "Nitrat in Würzburg 37,3 mg/l" gegen den neuesten Prüfbericht: supported, contradicted, outdated oder no_data, mit Beleg.

  • compare_cities

    Stellt die Werte des neuesten Prüfberichts von 2 bis 5 Orten nebeneinander (Hauptversorgung, je Stoff mit Messdatum, Grenzwert und Quelle). Fehlt ein Stoff, steht not_reported; es gibt keine Rangfolge und keine Gesamtnote.

  • get_data_gaps

    Wie viele der ausgewerteten Orte (Deutschland oder ein Bundesland) für einen Stoff einen Wert im Prüfbericht nennen und wie viele nicht – mit fertigem Zitiersatz. Zählt nur ausgewertete Orte, nicht alle Versorgungsgebiete.

  • get_changes

    Werte, die in zwei aufeinanderfolgenden Prüfberichten desselben Wassers stehen: vorher, nachher, beide Quellen mit SHA-256. Ohne Ursachenangabe, solange der Versorger keine nennt.

  • get_legal_limits

    Die heute geltenden Grenzwerte der deutschen Trinkwasserverordnung (TrinkwV 2023) mit Einheit, Art (Grenzwert oder Indikatorparameter) und Fundstelle.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "trinkwasser": {
      "type": "http",
      "url": "https://trinkwassermonitor.ink/api/v1/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http trinkwassermonitor https://trinkwassermonitor.ink/api/v1/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://trinkwassermonitor.ink/api/v1/mcp as a custom connector in the settings.

OpenAPI spec

12 paths, read 2026-10-27. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.