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City Toronto

Toronto public water records Toronto groups 5 water systems municipal. Overview of public records only, not a household tap test. Toronto public records Municipal 5 water systems

Worth a closer look

  • Over the last 4 years
  • 388 over-limit tests out of 105,886 municipal tests
  • 412 incident records
How to read these numbers

Town-water counts above are for municipal residential systems only — not every school or private system in the area.

They cover over the last 4 years of provincial open data we process (fiscal years: 2024-25, 2023-24, 2022-23, 2021-22).

Over-limit tests are flagged results among 105,886 municipal test results in that window — not a share of homes.

An incident record is a required system filing, not the same as an accident and not a count of taps affected.

Open a system page for timing, parameters, and official detail before drawing conclusions.

Water systems

4 of 5 systems have an elevated day-to-day note — listed first. Open a system for every reading and full records.

Water system City Of Toronto Drinking Water System - F. J. Horgan
  • Hardness · 120 mg/L as CaCO3 Hard water Longer-term only (too few samples from 2019 onward) · 1998–2016 · 26 samples
Water system City Of Toronto Drinking Water System - R.c.harris
  • Hardness · 120 mg/L as CaCO3 Hard water Longer-term only (too few samples from 2019 onward) · 1998–2015 · 32 samples
Water system City Of Toronto Drinking Water System - R.l. Clark
  • Hardness · 121 mg/L as CaCO3 Hard water Longer-term only (too few samples from 2019 onward) · 1998–2015 · 31 samples
Water system City Of Toronto Drinking Water System - Toronto Island
  • Hardness · 121 mg/L as CaCO3 Hard water Longer-term only (too few samples from 2019 onward) · 1998–2015 · 29 samples
Water system City Of Toronto Drinking Water System - Toronto Ds

Next steps

Questions for your city → Public records vs your home tap → How school records work → How child-care records work →
More detail

5 municipal town-water systems listed for this place.

Record grouping and evidence

  • Municipality field from MRS Inspection Rating dataset (5 municipal residential systems)
  • Municipal residential systems summarized: 5.
  • Municipal counts cover 4 recent fiscal years: 2024-25, 2023-24, 2022-23, 2021-22.
  • Municipal test results processed: 105,886 (388 over-limit tests).
  • Incident records (municipal): 412.

Technical identifiers

  • CITY OF TORONTO DRINKING WATER SYSTEM - F. J. HORGAN: system #220004536
  • CITY OF TORONTO DRINKING WATER SYSTEM - R.C.HARRIS: system #220002262
  • CITY OF TORONTO DRINKING WATER SYSTEM - R.L. CLARK: system #220002253
  • CITY OF TORONTO DRINKING WATER SYSTEM - TORONTO ISLAND: system #220002244
  • CITY OF TORONTO DRINKING WATER SYSTEM - TORONTO DS: system #260090363

Data limits

  • This area summary groups systems by municipality field from public records. Exact household service boundaries are not available in this dataset.
  • Town-water lists cover municipal residential systems (LMRS/SMRS). School and child-care building records appear when linked by place name.
  • This city page lists municipal town-water systems only. School and child-care water records are separate — search by name.