# io.github.squidcode/tapwatermap

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

- name: io.github.squidcode/tapwatermap
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 72/100 flags: no-repository
- quality: 91/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.squidcode%2Ftapwatermap
- tools: https://api.protogrid.dev/v1/servers/io.github.squidcode%2Ftapwatermap/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "tapwatermap": {
      "type": "http",
      "url": "https://mcp.tapwatermap.com/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 99
- freshness: 65
- provenance: 45
- drivers: +website +reachable +uptime-98% ~updated-116d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 91/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 10 of 10 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 1,071 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 10, about 1,071 tokens to load them all
- tool set hash: 04ae202816ece9492d94ef35be2d2e02
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.squidcode/tapwatermap.svg)](https://protogrid.dev/servers/io.github.squidcode/tapwatermap)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://mcp.tapwatermap.com/mcp (streamable-http, auth none, reachable true, uptime30d 0.98245615)

## Packages

_none_

## Tools (10)

- `compare_cities`: Compare the EPA records of several cities side by side. Pass cities as 'City, ST' strings.
- `coverage_stats`: What TapWaterMap covers: states, cities, total EPA violation records, and the data quarter/date.
- `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.
- `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.)
- `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.
- `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.
- `get_water_system`: EPA record for a single water system by its PWSID (e.g. 'VT0005053'): name, population served, source, and violations.
- `list_state_cities`: List all covered cities in a state (with violation counts).
- `search`: Search TapWaterMap for US cities by name. Returns matching cities with an id you can pass to `fetch`. (ChatGPT/Deep-Research compatible.)
- `search_cities`: Find covered US cities by name, optionally within a state. Returns counts + the page URL for each.