TapWaterMap MCP MCP server

A public, read-only MCP server that allows AI agents to query US tap-water quality data sourced from the EPA's SDWIS records. It provides tools to search for cities, fetch water system details, compare cities, and explain contaminants without requiring an API key or signup.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Squidcode LLC

MCP endpoint (Streamable HTTP)

https://mcp.tapwatermap.com/mcp

Vendor documentation

What you can do with it

Search for cities by name or state to find water systems
Fetch full water quality records for a specific city or PWSID
Compare water quality metrics across multiple cities side-by-side
Explain specific contaminants and their EPA health-based classifications

Tools advertised by the last live check:

search
fetch
search_cities
get_city_water
get_water_system
list_state_cities
find_cities
compare_cities
explain_contaminant
coverage_stats

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

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

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add tapwatermap-mcp --url https://mcp.tapwatermap.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable tapwatermap-mcp in your MCP settings.

Cursor configuration

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

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "tapwatermap-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.tapwatermap.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start tapwatermap-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "tapwatermap-mcp": {
      "type": "http",
      "url": "https://mcp.tapwatermap.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

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

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

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

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "tapwatermap-mcp": {
      "serverUrl": "https://mcp.tapwatermap.com/mcp"
    }
  }
}

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