io.github.cyanheads/epa-drinking-water-mcp-server

io.github.cyanheads/epa-drinking-water-mcp-server

Search EPA drinking water systems, violations, enforcement, and contaminant measurements.

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Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "epa-drinking-water-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/epa-drinking-water-mcp-server@0.3.0"
      ],
      "env": {
        "CANVAS_PROVIDER_TYPE": "none",
        "SDWIS_CLAMP_LIMITS": "true",
        "SDWIS_DATAFRAME_DROP_ENABLED": "false",
        "CANVAS_DEFAULT_ROW_LIMIT": "10000",
        "CANVAS_DEFAULT_MEMORY_LIMIT_MB": "512",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}
Environment variables
  • CANVAS_PROVIDER_TYPEOptional SQL staging in the npm runtime: none or duckdb.
  • SDWIS_CLAMP_LIMITSClamp inline row limits above 500 with a notice; false rejects them.
  • SDWIS_DATAFRAME_DROP_ENABLEDEnable removal of staged tables when DataCanvas is enabled.
  • CANVAS_DEFAULT_ROW_LIMITSQL retained-row ceiling; the server maximum is 25000.
  • CANVAS_DEFAULT_MEMORY_LIMIT_MBDuckDB memory budget per engine in MiB; maximum 512.
  • MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warn').

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.3.0
Registry
active
Published
11/3/2026

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