io.github.squidcode/tapwatermap

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

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

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "tapwatermap": {
      "url": "https://mcp.tapwatermap.com/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (10)

• search read-only

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

  Parameters:

  • query (required) — string — City name or partial name, e.g. 'Burlington'.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• fetch read-only

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

  Parameters:

  • id (required) — string — City id like 'vt/burlington' (state/slug).

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• search_cities read-only

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

  Parameters:

  • query (required) — string
  • limit — integer
  • state — string — Optional 2-letter state code, e.g. 'TX'.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_city_water read-only

  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.

  Parameters:

  • city (required) — string
  • state (required) — string — 2-letter state code, e.g. 'VT'.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_water_system read-only

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

  Parameters:

  • pwsid (required) — string

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• list_state_cities read-only

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

  Parameters:

  • state (required) — string — 2-letter state code.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• find_cities read-only

  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.

  Parameters:

  • 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.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• compare_cities read-only

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

  Parameters:

  • cities (required) — array — e.g. ['Burlington, VT', 'Houston, TX']

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• explain_contaminant read-only

  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.

  Parameters:

  • contaminant (required) — string — Contaminant name or EPA code, e.g. 'TTHM' or '2950'.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• coverage_stats read-only

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

  Hints: read-only yes · destructive no · idempotent yes · open-world no

Publisher website

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.