List Public Water Systems
epaenvirofacts/water-systems
Lists public drinking-water systems regulated by one US state or territory (the system's primacy agency) from EPA's Safe Drinking Water Information System (SDWIS) in Envirofacts, filtered by activity status and system type: id, name, mailing city and state, primacy agency, type, status, owner type, primary source, population served, connections and whether it is a wholesaler or serves a school or day-care. Pages with first_row and last_row (default the first 100 rows). Contact persons, phones, e-mail addresses and street addresses are not returned. Source: U.S. Environmental Protection Agency (EPA) Envirofacts, https://www.epa.gov/enviro, U.S. government data in the public domain, reduced to the fields listed (contact persons, phone numbers, e-mail addresses and mailing addresses are not returned) and served by Eden Engine; not an official EPA product.
Price
$0.0026 per call
You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.
Data source
Source: U.S. Environmental Protection Agency (EPA) Envirofacts, https://www.epa.gov/enviro, U.S. government data in the public domain, reduced to the fields listed (contact persons, phone numbers, e-mail addresses and mailing addresses are not returned) and served by Eden Engine; not an official EPA product.
Use it
Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.
Connect once and your AI can find and run this tool, and any other it needs.
// 1. search: find the tool
omnial_search({ query: "what you need" })
// 2. inspect: price and input schema
omnial_inspect({ tool: "epaenvirofacts/water-systems" })
// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "epaenvirofacts/water-systems" })
// 4. run: price the exact call first, then run it
omnial_execute({ tool: "epaenvirofacts/water-systems", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "epaenvirofacts/water-systems", input: { /* ... */ } })
// 5. settle: the call is charged when it finishes, nothing to doNot connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.
Pricing
Every charge this tool can incur.
| Charge | Price |
|---|---|
Per call | $0.0026 |
- Updated
- Oct 27, 2026
Input and output schemas
Input schema
{
"type": "object",
"required": [
"state",
"activity",
"system_type"
],
"properties": {
"state": {
"enum": [
"AL",
"AK",
"AZ",
"AR",
"CA",
"CO",
"CT",
"DE",
"DC",
"FL",
"GA",
"HI",
"ID",
"IL",
"IN",
"IA",
"KS",
"KY",
"LA",
"ME",
"MD",
"MA",
"MI",
"MN",
"MS",
"MO",
"MT",
"NE",
"NV",
"NH",
"NJ",
"NM",
"NY",
"NC",
"ND",
"OH",
"OK",
"OR",
"PA",
"RI",
"SC",
"SD",
"TN",
"TX",
"UT",
"VT",
"VA",
"WA",
"WV",
"WI",
"WY",
"AS",
"GU",
"MP",
"PR",
"VI"
],
"type": "string",
"description": "Two-letter postal code of the state or territory whose regulated systems to list (the system's primacy agency, not its mailing address): a state, DC, American Samoa (AS), Guam (GU), the Northern Mariana Islands (MP), Puerto Rico (PR) or the US Virgin Islands (VI), for example DE."
},
"activity": {
"enum": [
"A",
"I",
"N"
],
"type": "string",
"description": "A lists active systems, I inactive ones, N systems that changed from public to non-public."
},
"last_row": {
"type": "integer",
"default": 99,
"maximum": 4999,
"minimum": 0,
"description": "Index of the last row to return, counting from 0 and INCLUDING that row, so first_row 0 and last_row 99 return up to 100 rows. The highest allowed value is 4999. Must not be below first_row (a smaller value is a validation error). Fewer rows than asked for means the end of the matches."
},
"first_row": {
"type": "integer",
"default": 0,
"maximum": 4999,
"minimum": 0,
"description": "Index of the first row to return, counting from 0 in EPA's ordering of the matches. Combine with last_row to page."
},
"system_type": {
"enum": [
"CWS",
"NTNCWS",
"TNCWS"
],
"type": "string",
"description": "CWS lists community water systems (homes), NTNCWS non-transient non-community ones (schools, workplaces), TNCWS transient non-community ones (campgrounds, rest stops)."
}
},
"additionalProperties": false
}Output schema
{
"type": "object",
"required": [
"water_systems"
],
"properties": {
"water_systems": {
"type": "array",
"items": {
"type": "object",
"required": [
"pwsid"
],
"properties": {
"name": {
"type": [
"string",
"null"
],
"description": "Water system name."
},
"pwsid": {
"type": "string",
"description": "Public water system identifier: two-letter primacy agency code plus seven digits, for example DE0000004."
},
"epa_region": {
"type": [
"integer",
"null"
],
"description": "EPA region number, 1 to 10."
},
"owner_type": {
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "Owner code."
},
"label": {
"type": [
"string",
"null"
],
"description": "Plain-language owner type."
}
},
"description": "Federal, local, state, Native American, private or public/private ownership; null when EPA holds none.",
"additionalProperties": true
},
"system_type": {
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "CWS, NTNCWS or TNCWS."
},
"label": {
"type": [
"string",
"null"
],
"description": "Plain-language type."
}
},
"description": "Type: community, non-transient non-community or transient non-community water system.",
"additionalProperties": true
},
"mailing_city": {
"type": [
"string",
"null"
],
"description": "City in the system's mailing address."
},
"is_wholesaler": {
"type": [
"boolean",
"null"
],
"description": "True when the system sells water to other systems."
},
"mailing_state": {
"type": [
"string",
"null"
],
"description": "Two-letter code of the state in the system's mailing address. It can differ from the state the system serves; primacy_agency is the regulating state."
},
"primacy_agency": {
"type": [
"string",
"null"
],
"description": "Code of the agency that regulates the system, usually the state."
},
"primary_source": {
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "Source code."
},
"label": {
"type": [
"string",
"null"
],
"description": "Plain-language source."
}
},
"description": "Ground water, surface water or purchased water; null when EPA holds none.",
"additionalProperties": true
},
"activity_status": {
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "A, I, N or M."
},
"label": {
"type": [
"string",
"null"
],
"description": "Plain-language status."
}
},
"description": "Whether the system is active, inactive, or changed from public to non-public.",
"additionalProperties": true
},
"deactivation_date": {
"type": [
"string",
"null"
],
"description": "Date the system was deactivated, YYYY-MM-DD; null while it is active."
},
"population_served": {
"type": [
"integer",
"null"
],
"description": "People served by the system (a count)."
},
"service_connections": {
"type": [
"integer",
"null"
],
"description": "Number of service connections."
},
"is_school_or_daycare": {
"type": [
"boolean",
"null"
],
"description": "True when the system serves a school or day-care."
}
},
"description": "A public water system from EPA's Safe Drinking Water Information System (SDWIS).",
"additionalProperties": true
},
"description": "Matching systems in EPA's order."
}
},
"additionalProperties": true
}