Tapwatermap

Working · 3.0 s

io.github.squidcode/tapwatermapv1.0.0

Query US tap-water quality from the EPA's SDWIS records — by city, system, or contaminant.

Health & Science

Website Registry entry

Try it

Call this server's tools from your browser. Nothing to install.

https://mcp.tapwatermap.com/mcp

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

compare_cities

Compare the EPA records of several cities side by side. Pass cities as 'City, ST' strings.

citiesarray, required

e.g. ['Burlington, VT', 'Houston, TX']

Tools (10)

compare_cities

Compare the EPA records of several cities side by side. Pass cities as 'City, ST' strings.

read-only

Argument	Type	Description
cities*	array	e.g. ['Burlington, VT', 'Houston, TX']

Input schema (JSON)

{
  "type": "object",
  "required": [
    "cities"
  ],
  "properties": {
    "cities": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "e.g. ['Burlington, VT', 'Houston, TX']"
    }
  },
  "additionalProperties": false
}

coverage_stats

What TapWaterMap covers: states, cities, total EPA violation records, and the data quarter/date.

read-only

No arguments.

Input schema (JSON)

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

explain_contaminant

Plain-English explanation of an EPA contaminant by name or code: the EPA name, whether the EPA classifies it as health-based, and how often it appears in our records. Not medical advice.

read-only

Argument	Type	Description
contaminant*	string	Contaminant name or EPA code, e.g. 'TTHM' or '2950'.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "contaminant"
  ],
  "properties": {
    "contaminant": {
      "type": "string",
      "description": "Contaminant name or EPA code, e.g. 'TTHM' or '2950'."
    }
  },
  "additionalProperties": false
}

fetch

Fetch the full plain-English EPA tap-water record for a city id (e.g. 'vt/burlington') returned by `search`. (ChatGPT/Deep-Research compatible.)

read-only

Argument	Type	Description
id*	string	City id like 'vt/burlington' (state/slug).

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "City id like 'vt/burlington' (state/slug)."
    }
  },
  "additionalProperties": false
}

find_cities

Filter/rank cities across the dataset — e.g. cities in TX with open health-based violations, or cities with a specific contaminant. Returns ranked matches.

read-only

Argument	Type	Description
limit	integer
state	string	Optional 2-letter state code.
contaminant	string	Optional EPA contaminant code or name (use explain_contaminant to find a code).
minPopulation	integer
healthBasedOnly	boolean
openViolationsOnly	boolean	Only cities with violations not returned to compliance.

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer"
    },
    "state": {
      "type": "string",
      "description": "Optional 2-letter state code."
    },
    "contaminant": {
      "type": "string",
      "description": "Optional EPA contaminant code or name (use explain_contaminant to find a code)."
    },
    "minPopulation": {
      "type": "integer"
    },
    "healthBasedOnly": {
      "type": "boolean"
    },
    "openViolationsOnly": {
      "type": "boolean",
      "description": "Only cities with violations not returned to compliance."
    }
  },
  "additionalProperties": false
}

get_city_water

The core tool: what the EPA has on record for a city's tap water — the active community water systems serving it, populations, sources, and violations (contaminant, health-based or not, dates, status, level vs limit when recorded). Plain-English, sourced, never a safety verdict.

read-only

Argument	Type	Description
city*	string
state*	string	2-letter state code, e.g. 'VT'.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "city",
    "state"
  ],
  "properties": {
    "city": {
      "type": "string"
    },
    "state": {
      "type": "string",
      "description": "2-letter state code, e.g. 'VT'."
    }
  },
  "additionalProperties": false
}

get_water_system

EPA record for a single water system by its PWSID (e.g. 'VT0005053'): name, population served, source, and violations.

read-only

Argument	Type	Description
pwsid*	string

Input schema (JSON)

{
  "type": "object",
  "required": [
    "pwsid"
  ],
  "properties": {
    "pwsid": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

list_state_cities

List all covered cities in a state (with violation counts).

read-only

Argument	Type	Description
state*	string	2-letter state code.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "state": {
      "type": "string",
      "description": "2-letter state code."
    }
  },
  "additionalProperties": false
}

Search TapWaterMap for US cities by name. Returns matching cities with an id you can pass to `fetch`. (ChatGPT/Deep-Research compatible.)

read-only

Argument	Type	Description
query*	string	City name or partial name, e.g. 'Burlington'.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "description": "City name or partial name, e.g. 'Burlington'."
    }
  },
  "additionalProperties": false
}

search_cities

Find covered US cities by name, optionally within a state. Returns counts + the page URL for each.

read-only

Argument	Type	Description
limit	integer
query*	string
state	string	Optional 2-letter state code, e.g. 'TX'.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "limit": {
      "type": "integer"
    },
    "query": {
      "type": "string"
    },
    "state": {
      "type": "string",
      "description": "Optional 2-letter state code, e.g. 'TX'."
    }
  },
  "additionalProperties": false
}