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City Ottawa

Water system Central Drinking Water System - Lemieux Island

Municipal drinking-water system

Worth a closer look

Recent public records include a few items that deserve attention.

1 Incident record

over the last 4 years

View details →
▸ How to read these numbers
  • Incident records. Ontario systems must file these reports for many operational signals (sampling flags, instrument notices, follow-ups, and similar). A report is not the same as an “accident,” and a high count does not by itself mean people at this building had a water emergency. Open the detailed records for what was filed.

Worth knowing day to day

Plant averages from the provincial monitoring program (not this year’s report and not your kitchen tap). When enough samples exist from 2019 onward, we prefer that recent window and compare it to the longer record.

pH balance and clarity icon A balance scale showing equilibrium

pH balance · 9.4 Slightly basic · usual 6.5–8.5 (Ontario)

Recent average · 2019 · 11 samples

Recent 2019 · Slightly basic · 9.4 · Same band as longer term Longer term · Slightly basic · 9.2 · 2003–2019 · 134 samples

Above the usual 6.5–8.5 band. Higher pH can mean more scale on kettles and fixtures.

Learn more →
Hardness and mineral scale icon A kettle showing mineral scale build-up

Hardness · 30 mg/L as CaCO3 Soft water · soft <60 · hard 60–180 · very hard >180 mg/L

Longer-term only (too few samples from 2019 onward) · 1998–2016 · 47 samples

Learn more →
Sodium diet icon A heart and salt shaker, representing diet warning levels

Sodium level · 15.4 mg/L Typical levels · diet notice 20 · taste ≤200 mg/L

Longer-term only (too few samples from 2019 onward) · 2011–2016 · 20 samples

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Chloride and road-salt icon A snowflake and a road outline, representing runoff signals

Chloride · 6 mg/L Typical levels · taste ≤250 mg/L (Ontario)

Longer-term only (too few samples from 2019 onward) · 1998–2019 · 75 samples

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Nitrate context icon A plant leaf, representing agricultural fertilizer runoff

Nitrate + Nitrite · 0.17 mg/L as N Typical levels · standard 10 mg/L as N (Ontario)

Longer-term only (too few samples from 2019 onward) · 2003–2023 · 61 samples

Learn more →
Fluoride and dental health icon A clean tooth outline, representing fluoridation protection

Fluoride · 0.71 mg/L In the dental target range · target 0.5–0.8 · max 1.5 mg/L

Longer-term only (too few samples from 2019 onward) · 1998–2019 · 74 samples

Learn more →

Next steps

How to read this record → Ask your municipality →
What's behind these numbers

Years covered: 2024-25, 2023-24, 2022-23, 2021-22.

What the numbers refer to

Incident records

Incident records are required system filings — not a count of taps affected, and not automatically a drinking-water emergency.

  • 1 incident record in public records — not a count of taps affected.
Other public-record context

Inspection history

Provincial inspection scores have generally been high in the years available.

  • MRS inspection ratings in recent years: 100.0%, 100.0%, 100.0%, 100.0%.
  • Inspection ratings come from the MRS Inspection Rating Water Quality table.
  • Other recent records include: 1 incident record.
  • Inspection ratings summarize provincial inspections, not every individual test.

Owner and operator context

Owner: Ottawa, Corporation Of The City Of

Evidence

  • Owner on record: OTTAWA, CORPORATION OF THE CITY OF (Owner Legal Name, Test Results).
  • Operating authority was not present in the local records we processed.
  • Contact details (phone, website, email) are not available in the local provincial open-data files we processed.

Nearby reports

Other public records related to Ottawa.

  • Confidence: high
    Why shown: Direct DWS number and system-name match.
    Limitation: This is a related public-record result, not a confirmed household service-boundary match.
  • Confidence: high
    Why shown: Direct DWS number and system-name match.
    Limitation: This is a related public-record result, not a confirmed household service-boundary match.
  • Confidence: high
    Why shown: Direct DWS number and system-name match.
    Limitation: This is a related public-record result, not a confirmed household service-boundary match.
  • Confidence: high
    Why shown: Direct DWS number and system-name match.
    Limitation: This is a related public-record result, not a confirmed household service-boundary match.
  • Confidence: high
    Why shown: Direct DWS number and system-name match.
    Limitation: This is a related public-record result, not a confirmed household service-boundary match.
  • Confidence: high
    Why shown: Direct DWS number and system-name match.
    Limitation: This is a related public-record result, not a confirmed household service-boundary match.

Reports related to this area, grouped by municipality field. Not a confirmed household service-boundary match.

About this record set

Data coverage

Based on public records for 4 recent fiscal years: 2024-25, 2023-24, 2022-23, 2021-22.

  • Covers recent fiscal years only; older years are not summarized here.

Record identifiers

System number:
220003207
System category:
LMRS (Municipal drinking-water system)
Owner on record:
OTTAWA, CORPORATION OF THE CITY OF
Public health unit:
CITY OF OTTAWA HEALTH DEPARTMENT
Regulation:
Reg 170/03