Tapwatermap

io.github.squidcodePublished by GitHub account squidcodev1.0.0Updated Oct 28, 2026

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

VerifiedStreamable HTTPWeb executableLocation & LifestyleData & Analytics

Overview

AI-generated overview

Remote MCP server that lets an assistant look up US tap-water quality from EPA SDWIS records by city, water system, or contaminant.

What you can do
  • Search and list covered US cities by name or state, with counts and page URLs
  • Fetch a city's plain-English EPA tap-water record: serving water systems, populations, sources and violations
  • Look up a single water system by PWSID, and compare several cities side by side
  • Filter and rank cities by state, open health-based violations, or a specific contaminant
  • Explain an EPA contaminant by name or code, and report dataset coverage and data quarter
When to use it
Useful when someone asks about the drinking water in a US city, wants to compare cities or water systems, or needs to know which contaminants appear in EPA violation records. It reports sourced records rather than a safety verdict.
Requirements
A remote streamable HTTP endpoint; no package, account, API key, header or environment variable is declared. Network access to the hosted endpoint is required.
Before you install
Results are EPA records presented in plain English and are explicitly not a safety verdict or medical advice; do not treat them as health guidance. Data reflects the coverage quarter reported by the server, so it may lag current conditions.

Installation

In SourceWeft

  1. Open Tapwatermap in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.squidcode%2Ftapwatermap/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

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

Tools

10

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.)

Parametersidrequired

search_cities

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

Parameterslimitqueryrequiredstate

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.

Parameterscityrequiredstaterequired

get_water_system

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

Parameterspwsidrequired

list_state_cities

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

Parametersstaterequired

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.

ParameterslimitstatecontaminantminPopulationhealthBasedOnlyopenViolationsOnly

compare_cities

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

Parameterscitiesrequired

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.

Parameterscontaminantrequired

coverage_stats

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

Takes no parameters.

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.