Tapwatermap MCP Server

by squidcode Your server? Claim it

answering

Tapwatermap is answering right now. Last checked 11 min ago. It exposes 10 tools.

Query US tap-water quality from the EPA's SDWIS records — by city, system, or contaminant.

Uptime history 47 days of history

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

98 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Tapwatermap every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add tapwatermap --transport http https://mcp.tapwatermap.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "tapwatermap": {
      "url": "https://mcp.tapwatermap.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.tapwatermap]
url = "https://mcp.tapwatermap.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "tapwatermap": {
      "url": "https://mcp.tapwatermap.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "tapwatermap": {
      "url": "https://mcp.tapwatermap.com/mcp"
    }
  }
}

Available tools 10

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

cities

find_cities

Filter/rank cities across the dataset — e.g. cities in TX with open health-based violations, or cities with a specific contaminant. Returns ranked matches.

search_cities

Find covered US cities by name, optionally within a state. Returns counts + the page URL for each.

city

get_city_water

The core tool: what the EPA has on record for a city's tap water — the active community water systems serving it, populations, sources, and violations (contaminant, health-based or not, dates, status, level vs limit when recorded). Plain-English, sourced, never a safety verdict.

compare

compare_cities

Compare the EPA records of several cities side by side. Pass cities as 'City, ST' strings.

coverage

coverage_stats

What TapWaterMap covers: states, cities, total EPA violation records, and the data quarter/date.

explain

explain_contaminant

Plain-English explanation of an EPA contaminant by name or code: the EPA name, whether the EPA classifies it as health-based, and how often it appears in our records. Not medical advice.

fetch

fetch

Fetch the full plain-English EPA tap-water record for a city id (e.g. 'vt/burlington') returned by `search`. (ChatGPT/Deep-Research compatible.)

search

Search TapWaterMap for US cities by name. Returns matching cities with an id you can pass to `fetch`. (ChatGPT/Deep-Research compatible.)

state

list_state_cities

List all covered cities in a state (with violation counts).

water

get_water_system

EPA record for a single water system by its PWSID (e.g. 'VT0005053'): name, population served, source, and violations.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.tapwatermap.com/mcp	streamable-http	answering	137 ms	11 min ago

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Tapwatermap — questions

Answers built from our own checks of this server.

What can Tapwatermap do?

It exposes 10 tools, read directly from the server on our last check. Among them: compare_cities, coverage_stats, explain_contaminant, fetch, find_cities, get_city_water and 4 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Tapwatermap working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 98 ms. The bar chart above shows every period we have measured.

How do I connect Tapwatermap?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Tapwatermap need an API key?

No. Tapwatermap completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 10 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Tapwatermap?

It answers our handshake in 98 ms on average, which is faster than 83% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.