io.github.squidcode/tapwatermap

by squidcode · remote · no sign-in to list tools · v1.0.0 · published by GitHub user squidcode

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

Changes · 1

Compare Registry entry

10 tools: 1 change things and 9 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things1Claude Code: ask: see these tools
Only reads9Claude Code: allow: see these tools

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http tapwatermap https://mcp.tapwatermap.com/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

10 tools

Changes things 1Creates or changes something that can be changed back.Claude Code: ask

coverage_statsWhat TapWaterMap covers: states, cities, total EPA violation records, and the data quarter/date.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
What TapWaterMap covers: states, cities, total EPA violation records, and the data quarter/date.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 9Looks things up and changes nothing.Claude Code: allow

compare_citiesCompare the EPA records of several cities side by side.No findings
Why it is in this group
- The name "compare_cities" says "compare": a word for reading.
Description, as the server wrote it
Compare the EPA records of several cities side by side. Pass cities as 'City, ST' strings.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
explain_contaminantPlain-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.No findings
Why it is in this group
- The name "explain_contaminant" says "explain": a word for reading.
Description, as the server wrote it
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.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
fetchFetch the full plain-English EPA tap-water record for a city id (e.g.No findings
Why it is in this group
- The name "fetch" says "fetch": a word for reading.
Description, as the server wrote it
Fetch the full plain-English EPA tap-water record for a city id (e.g. 'vt/burlington') returned by `search`. (ChatGPT/Deep-Research compatible.)
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
find_citiesFilter/rank cities across the dataset — e.g.No findings
Why it is in this group
- The name "find_cities" says "find": a word for reading.
Description, as the server wrote it
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.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_city_waterThe 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…No findings
Why it is in this group
- The name "get_city_water" says "get": a word for reading.
Description, as the server wrote it
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.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_water_systemEPA record for a single water system by its PWSID (e.g.No findings
Why it is in this group
- The name "get_water_system" says "get": a word for reading.
Description, as the server wrote it
EPA record for a single water system by its PWSID (e.g. 'VT0005053'): name, population served, source, and violations.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_state_citiesList all covered cities in a state (with violation counts).No findings
Why it is in this group
- The name "list_state_cities" says "list": a word for reading.
Description, as the server wrote it
List all covered cities in a state (with violation counts).
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
searchSearch TapWaterMap for US cities by name.No findings
Why it is in this group
- The name "search" says "search": a word for reading.
Description, as the server wrote it
Search TapWaterMap for US cities by name. Returns matching cities with an id you can pass to `fetch`. (ChatGPT/Deep-Research compatible.)
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_citiesFind covered US cities by name, optionally within a state.No findings
Why it is in this group
- The name "search_cities" says "search": a word for reading.
Description, as the server wrote it
Find covered US cities by name, optionally within a state. Returns counts + the page URL for each.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http tapwatermap https://mcp.tapwatermap.com/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__tapwatermap__search",
      "mcp__tapwatermap__fetch",
      "mcp__tapwatermap__search_cities",
      "mcp__tapwatermap__get_city_water",
      "mcp__tapwatermap__get_water_system",
      "mcp__tapwatermap__list_state_cities",
      "mcp__tapwatermap__find_cities",
      "mcp__tapwatermap__compare_cities",
      "mcp__tapwatermap__explain_contaminant"
    ],
    "ask": [
      "mcp__tapwatermap__coverage_stats"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as tapwatermap. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.squidcode/tapwatermap/changes.xml

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Source: MCP Registry. Synced Oct 21, 2026, 18:49 UTC.

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