Lake Ontario Tributary Water Chemistry, 2018-2023

Seven rivers flowing into Lake Ontario near Toronto were sampled year-round from 2018 to 2023 to measure pollutant loads. Government of Ontario staff collected discrete and composite water samples, analyzing nutrients, major ions, suspended solids, heavy metals, and microbial indicators. The data aims to quantify the materials these tributaries carry into the lake.

Use Cases

• Model nutrient runoff into Lake Ontario based on measured nutrient concentrations.
• Assess heavy metal contamination trends in urban tributaries based on heavy metals data.
• Compare pollutant loads from discrete vs. composite sampling methods mentioned in the description.
• Analyze seasonal water quality variations based on year-round sampling.

Strengths

• Six-year temporal coverage from 2018 to 2023.
• Multiple analyte groups measured, including nutrients, ions, solids, metals, and microbes.
• Includes both discrete and composite sample types for methodological comparison.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the Greater Toronto Area focus.

Provenance

Source

Government of Ontario

Collection Method

Ministry staff collected water quality samples year-round from seven rivers.

Time Range

2018 to 2023

Freshness

Last updated 2026-03-18 12:02:54.148445; freshness should be verified.

Geography

Rivers flowing into Lake Ontario in the Greater Toronto Area, Ontario, Canada.