PASAR API

🇨🇦 DFO CHS ~ Canadian tides & water levels (IWLS)

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The Canadian Hydrographic Service Integrated Water Level System serves predictions, observations and forecasts at water-level stations nationwide with a public Swagger-documented API.

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Call it

curl 'https://api-iwls.dfo-mpo.gc.ca/api/v1'

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I'm building an app using a free Canada API (no auth needed).

API: DFO CHS ~ Canadian tides & water levels (IWLS)
Provider: Fisheries and Oceans Canada (CHS)
Endpoint: GET https://api-iwls.dfo-mpo.gc.ca/api/v1
It returns JSON.

Source: Fisheries and Oceans Canada (CHS) (https://tides.gc.ca/en/web-services-offered-canadian-hydrographic-service)
Source type: Official open-data catalogue
Endpoint type: Open-data catalogue JSON
Integration difficulty: Copy-paste ready
Last checked: 2026-07-05
Production caveat: Still handle empty rows, schema changes, pagination, stale coverage, and temporary upstream failures.

Help me fetch this and build a simple page that displays it nicely. Include basic production safeguards for errors, empty responses, schema changes, caching, and rate limits.

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