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Water system Sudbury Drinking Water System - David St

Municipal drinking-water system

Worth a closer look

Recent public records include a few items that deserve attention.

1 Over-limit test

Total coliform · over the last 4 years

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6 Incident records

over the last 4 years

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▸ How to read these numbers

Over-limit tests. That is a regulatory flag in the public record. A count alone does not say how long a result lasted, whether it was retested, or that every tap in the building was affected. Open the detailed records for timing and context.
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.

Sodium level · 57.5 mg/L Above the diet notice level · diet notice 20 · taste ≤200 mg/L

Longer-term only (too few samples from 2019 onward) · 2009–2019 · 50 samples

People on a low-sodium diet may want to know this. Ask a clinician for personal advice.

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Hardness · 60 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) · 1998–2019 · 90 samples

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Chloride · 89 mg/L Typical levels · taste ≤250 mg/L (Ontario)

Longer-term only (too few samples from 2019 onward) · 1998–2019 · 112 samples

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Nitrate + Nitrite · 0.08 mg/L as N Typical levels · standard 10 mg/L as N (Ontario)

Recent average · 2019–2023 · 4 samples

Recent 2019–2023 · Typical levels · 0.08 mg/L as N · Same band as longer term Longer term · Typical levels · 0.03 mg/L as N · 2003–2023 · 84 samples

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Fluoride · 0.47 mg/L Typical levels · target 0.5–0.8 · max 1.5 mg/L

Longer-term only (too few samples from 2019 onward) · 1998–2019 · 147 samples

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pH balance · 7.6 In the usual range · usual 6.5–8.5 (Ontario)

Recent average · 2019–2020 · 11 samples

Recent 2019–2020 · In the usual range · 7.6 · Same band as longer term Longer term · In the usual range · 7.5 · 2003–2020 · 249 samples

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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

Over-limit tests

Regulatory flags when a monitored result was above an Ontario standard. A count alone does not say how long a result lasted or that every tap was affected.

1 over-limit test in recent records.

7,054 recent test results processed.
Parameters involved: Total coliform.

Incident records

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

6 incident records 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 over-limit test and 6 incident records.

Inspection ratings summarize provincial inspections, not every individual test.

Source and operator context

Owner: Greater Sudbury, City Of

Source-water context has not yet been linked from local intake-station data.

Evidence

Owner on record: GREATER SUDBURY, CITY OF (Owner Legal Name, Test Results).

Operating authority was not present in the local records we processed.
Source-water context has not yet been linked from local intake-station data.
Contact details (phone, website, email) are not available in the local provincial open-data files we processed.

Nearby reports

Other public records related to Greater Sudbury.

VALLEY DRINKING WATER SYSTEM (system)

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.
SUDBURY DRINKING WATER SYSTEM - WAHNAPITEI (system)

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.
DOWLING DRINKING WATER SYSTEM (system)

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.
SUDBURY DRINKING WATER SYSTEM - GARSON (system)

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.
ONAPING/LEVACK DRINKING WATER SYSTEM (system)

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.
FALCONBRIDGE DRINKING WATER SYSTEM (system)

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:: 220003537
System category:: LMRS (Municipal drinking-water system)
Owner on record:: GREATER SUDBURY, CITY OF
Public health unit:: SUDBURY AND DISTRICT HEALTH UNIT
Regulation:: Reg 170/03