Data

The full ranked time series, free to download. Every number on this site comes from these files.

er_waits_ranked.csv

The complete tidy dataset: one row per month, measure, and hospital site.

hospitals.json

One row per hospital ER site: name, coordinates, latest values and ranks.

series.json

Per-measure monthly series for every site.

rankings.json

Latest-month ranking per measure.

movers.json

Biggest improvements and declines vs 6 and 12 months ago.

nearest.json

Three nearest ERs per site with latest wait times and gaps.

provincial.json

Provincial monthly series per measure.

meta.json

Build facts: sources, vintage, coverage, caveats.

Use this data from your AI assistant

Connect any MCP-compatible assistant to this site's data server and ask questions in plain language.

Add this MCP server to ChatGPT (Settings > Apps > Add custom app):
URL: /mcp
Tools: er_lookup (one hospital's monthly wait series), wait_ranking (ranked hospitals for a month), movers (biggest improvements and declines).
Then ask: "Which Ontario ERs got slower this year?"

API

Query the same data programmatically. Full specification at /api/openapi.json, and an MCP server at POST /mcp for AI assistants.

/api/v1/summary /api/v1/ranking /api/v1/movers /api/openapi.json

Source: Ontario Health monthly per-site tables, 2025-08 to 2026-08 (monthly).