sdwis.water.systems
Search EPA Safe Drinking Water Information System (SDWIS) for public water systems by state, system type (Community/Transient/Non-Transient), and activity status. Returns PWSID, system name, population served, service connections, water source type, and operator information. Covers 150,000+ US pu...
This record as markdown: /tools/io-github-whiteknightonhorse-apibase/sdwis.water.systems.md
What sdwis.water.systems does on Apibase
AI agents call sdwis.water.systems to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
type | string | — | Public water system type: CWS (Community), TNCWS (Transient Non-Community), NTNCWS (Non-Transient Non-Community) |
limit | integer | — | Maximum number of water systems to return (1–100, default 20) |
state | string | — | US state code or primacy agency code (e.g. CA, TX, FL). Omit for all states. |
activity | string | — | Activity status code: A (Active), I (Inactive), N (New), M (Merger), P (Proposed). Default is all. |
Parameters from the server's own tool schema.
Why sdwis.water.systems is rated Low
Queries publicly available EPA drinking water system data without modifying, deleting, or executing operations.
From the tool's definition Search EPA Safe Drinking Water Information System for public water systems, returns PWSID, system name, population served.
Attacks that exploit this kind of access
The rule that runs sdwis.water.systems safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Apibase, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For sdwis.water.systems, this is the rule to start with:
sdwis.water.systems is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Apibase, apply this rule, and every sdwis.water.systems call is checked against it from then on.
Questions about sdwis.water.systems
Search EPA Safe Drinking Water Information System (SDWIS) for public water systems by state, system type (Community/Transient/Non-Transient), and activity status. Returns PWSID, system name, population served, service connections, water source type, and operator information. Covers 150,000+ US public water systems regulated under the Safe Drinking Water Act. Use sdwis.water.violations to check health violations for a specific system. Data source: EPA SDWIS Federal Reporting Services (data.epa.gov/efservice), US Gov public domain. It is categorised as a Read tool in the Apibase MCP Server, which means it retrieves data without modifying state.
sdwis.water.systems accepts 4 parameters: type, limit, state, activity. The full parameter table on this page comes from the server's own tool schema.
Register the Apibase MCP server in PolicyLayer and add a rule for sdwis.water.systems: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Apibase. Nothing to install.
sdwis.water.systems is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the sdwis.water.systems rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for sdwis.water.systems. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
sdwis.water.systems is provided by the Apibase MCP server (apibase-mcp-client). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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