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Compare servers	Usgs Water MCP Server
Purpose	Query real-time and historical water data from ~8,000 USGS stream gages and groundwater wells via MCP. STDIO or Streamable HTTP.
Authentication (maintainer declared)	Unknown
Public launch command	Project-specific setup
Configuration source	Public install instructions
Observed tools	Unknown
Last complete tool check	Unknown
License	Apache-2.0
	Open setup

A complete tool check lists tools; it does not exercise them or certify security.