Drinking Water — EPA SDWIS: Water Systems & Health-Based Violations

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EPA drinking water data: 434,757 public water systems, current health-based violations. No key.

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get_county_water_summary Read-only

Summarize public water systems serving a US county: how many systems (and how many active), total population served, how many systems have current health-based violations and how many such violations are open, plus the worst-affected systems in the county. County names are as reported to SDWIS (uppercase). A county summary covers every system serving any part of the county; it is not a verdict on the water system at a specific address.

statestring, required

Two-letter state code, e.g. IL

countystring, required

County name, e.g. COOK

Tools (6)

get_county_water_summary

read-only

Argument	Type	Description
state*	string	Two-letter state code, e.g. IL
county*	string	County name, e.g. COOK

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state",
    "county"
  ],
  "properties": {
    "state": {
      "type": "string",
      "description": "Two-letter state code, e.g. IL"
    },
    "county": {
      "type": "string",
      "description": "County name, e.g. COOK"
    }
  }
}

get_current_health_violations

List current (unresolved) health-based drinking water violations from EPA SDWIS: maximum contaminant level (MCL), maximum residual disinfectant level (MRDL), and treatment-technique violations whose status is Unaddressed or Addressed. Monitoring and reporting violations are excluded. Filter by state, by PWSID, or by contaminant code; most recent compliance periods first.

read-only

Argument	Type	Description
limit	number	Max results (default 50, max 500)
pwsid	string	Only this system's violations
state	string	Two-letter state code, e.g. IL
contaminant_code	string	SDWIS contaminant code, e.g. 1040 (nitrate)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "number",
      "default": 50,
      "description": "Max results (default 50, max 500)"
    },
    "pwsid": {
      "type": "string",
      "description": "Only this system's violations"
    },
    "state": {
      "type": "string",
      "description": "Two-letter state code, e.g. IL"
    },
    "contaminant_code": {
      "type": "string",
      "description": "SDWIS contaminant code, e.g. 1040 (nitrate)"
    }
  }
}

get_state_water_summary

Summarize public water systems for a whole US state: system counts, population served, systems with current health-based violations, and the counties with the most affected systems. Data is EPA SDWIS.

read-only

Argument	Type	Description
state*	string	Two-letter state code, e.g. IL

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "state": {
      "type": "string",
      "description": "Two-letter state code, e.g. IL"
    }
  }
}

get_water_system

Look up one US public water system by its PWSID (e.g. IL0970450). Returns the system's identity, type (community, transient, non-transient non-community), population served, service connections, owner and source type, the counties it serves, and its current health-based violations (unresolved MCL, MRDL, and treatment-technique violations) from EPA SDWIS.

read-only

Argument	Type	Description
pwsid*	string	Public Water System ID, e.g. IL0970450

Input schema (JSON)

{
  "type": "object",
  "required": [
    "pwsid"
  ],
  "properties": {
    "pwsid": {
      "type": "string",
      "description": "Public Water System ID, e.g. IL0970450"
    }
  }
}

list_contaminants_with_violations

List every contaminant that has at least one current health-based violation in EPA SDWIS, with the number of open violations and the number of water systems affected, most violations first. Useful for seeing which contaminants drive current US drinking water violations.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {}
}

search_water_systems

Search US public water systems by name, and optionally narrow by state (two-letter code), county name as reported to SDWIS (requires state), system type code (CWS, NTNCWS, TNCWS), or active systems only. Results are ordered by population served, largest first, and each result includes its count of current health-based violations.

read-only

Argument	Type	Description
type	string	System type code: CWS, NTNCWS, or TNCWS
limit	number	Max results (default 50, max 500)
query	string	Name fragment to match, e.g. 'Springfield'
state	string	Two-letter state code, e.g. IL
county	string	County name as reported to SDWIS, e.g. COOK (requires state)
active_only	boolean	Only active systems

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "description": "System type code: CWS, NTNCWS, or TNCWS"
    },
    "limit": {
      "type": "number",
      "default": 50,
      "description": "Max results (default 50, max 500)"
    },
    "query": {
      "type": "string",
      "description": "Name fragment to match, e.g. 'Springfield'"
    },
    "state": {
      "type": "string",
      "description": "Two-letter state code, e.g. IL"
    },
    "county": {
      "type": "string",
      "description": "County name as reported to SDWIS, e.g. COOK (requires state)"
    },
    "active_only": {
      "type": "boolean",
      "default": false,
      "description": "Only active systems"
    }
  }
}

Drinking Water — EPA SDWIS: Water Systems & Health-Based Violations

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get_county_water_summary Read-only

Drinking Water — EPA SDWIS: Water Systems & Health-Based Violations

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get_county_water_summary Read-only

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Tools (6)

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