Water Quality Tributary Monitoring
Water quality chemistry lab results from year-round monitoring of 6 tributaries discharging nutrients to Lake Ontario during high river discharge and adverse weather events.
The samples span from 2018-2024 and were collected at the following 6 locations: Cobourg Creek, Ganaraska River, Graham Creek, Wilmot Creek within Ganaraska Conservation Authority (GRCA) and Carruthers Creek and Duffins Creek within Toronto and Region Conservation Authority (TRCA).
This data supports the need to determine exit loads of nutrients to Western Lake Ontario, and of the water quality characteristics of the water discharged into the nearshore of the lake, focused on the heavily urbanized rivers which predominate on the Ontario shores of the lake. During periods of elevated river discharge coincident with wet weather and snow melt discharge volume-weighted and time-integrated water samples were collected using automated ISCO water samplers controlled remotely. The samples were analyzed for nutrients, chloride and selected water quality variables used to interpret the sources of the nutrient loads. In addition to the event samples, monthly grab samples were collected during low river flow to provide information on water quality and loading levels under river baseflow conditions. The river sampling is year-round with special emphasis on winter and early spring conditions, periods when high discharge and loading rates are most expected.
The laboratory analysis of the water samples was conducted at the York Durham Regional Environmental Laboratory (YDREL).
Attributes Notes
Lab: MDL = Minimum detection level that the lab can detect
Data Limitations: Some attributes of supplemental information are incomplete
Data update frequency: Not Planned
Datasets available for download
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WQ_TributaryLoadingFeature Layer
Layer 0 via ArcGIS REST API
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WQ_TributaryLoading (Explore)HTML
Explore WQ_TributaryLoading on ArcGIS Hub
Additional Info
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| Last Updated | May 19, 2026, 16:31 (UTC) |
| Created | May 19, 2026, 16:31 (UTC) |
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Domain / Topic
Domain or topic of the dataset being cataloged.
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Title
Title for the Dataset.
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Water Quality Tributary Monitoring |
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Description
A description of the dataset.
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Water quality chemistry lab results from year-round monitoring of 6 tributaries discharging nutrients to Lake Ontario during high river discharge and adverse weather events. The samples span from 2018-2024 and were collected at the following 6 locations: Cobourg Creek, Ganaraska River, Graham Creek, Wilmot Creek within Ganaraska Conservation Authority (GRCA) and Carruthers Creek and Duffins Creek within Toronto and Region Conservation Authority (TRCA). This data supports the need to determine exit loads of nutrients to Western Lake Ontario, and of the water quality characteristics of the water discharged into the nearshore of the lake, focused on the heavily urbanized rivers which predominate on the Ontario shores of the lake. During periods of elevated river discharge coincident with wet weather and snow melt discharge volume-weighted and time-integrated water samples were collected using automated ISCO water samplers controlled remotely. The samples were analyzed for nutrients, chloride and selected water quality variables used to interpret the sources of the nutrient loads. In addition to the event samples, monthly grab samples were collected during low river flow to provide information on water quality and loading levels under river baseflow conditions. The river sampling is year-round with special emphasis on winter and early spring conditions, periods when high discharge and loading rates are most expected.
The laboratory analysis of the water samples was conducted at the York Durham Regional Environmental Laboratory (YDREL). Attributes Notes Lab: MDL = Minimum detection level that the lab can detect Data Limitations: Some attributes of supplemental information are incomplete Data update frequency: Not Planned |
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Tags / Keywords
Keywords/tags categorizing the dataset.
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Format (CSV, XLS, TXT, PDF, etc)
File format of the dataset.
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Dataset Size
Dataset size in megabytes.
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0.08 |
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Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
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Published Date
Published date of the dataset.
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2026-02-27 |
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Time Period Data Span (start date)
Start date of the data in the dataset.
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Time Period Data Span (end date)
End date of time data in the dataset.
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GeoSpatial Area Data Span
A spatial region or named place the dataset covers.
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Access category
Type of access granted for the dataset (open, closed, service, etc).
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public |
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License
License used to access the dataset.
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License not specified |
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Limits on use
Limits on use of data.
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Location
Location of the dataset.
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https://trca-camaps.opendata.arcgis.com/datasets/camaps::water-quality-tributary-monitoring |
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Data Service
Data service for accessing a dataset.
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Owner
Owner of the dataset.
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trca_d.macleod |
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Contact Point
Who to contact regarding access?
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Conservation Ontario |
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Contact Point Email
The email to contact regarding access?
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[email protected] |
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Publisher
Publisher of the dataset.
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Conservation Ontario |
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Publisher Email
Email of the publisher.
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Author
Author of the dataset.
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trca_d.macleod |
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Author Email
Email of the author.
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Accessed At
Date the data and metadata was accessed.
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2026-02-27 |
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Identifier
Unique identifier for the dataset.
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0c0c1ca3ff734382a9ad90babd90c592 |
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Language
Language(s) of the dataset
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English |
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Link to dataset description
A URL to an external document describing the dataset.
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https://trca-camaps.opendata.arcgis.com/datasets/camaps::water-quality-tributary-monitoring |
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Persistent Identifier
Data is identified by a persistent identifier.
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Globally Unique Identifier
Data is identified by a persistent and globally unique identifier.
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Contains data about individuals
Does the data hold data about individuals?
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Contains data about identifiable individuals
Does the data hold identifiable data about individual?
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Contains Indigenous Data
Does the data hold data about Indigenous communities?
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Portal Type
Platform type of the source portal.
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Version
Version of the datatset
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None |
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Source
Source of the dataset.
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None |
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Version notes
Version notes about the dataset.
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Is version of another dataset
Link to dataset that it is a version of.
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Other versions
Link to datasets that are versions of it.
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Provenance Text
Provenance Text of the data.
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Conservation Ontario |
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Provenance URL
Provenance URL of the data.
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Temporal resolution
Describes how granular the date/time data in the dataset is.
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GeoSpatial resolution in meters
Describes how granular (in meters) geospatial data is in the dataset.
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GeoSpatial resolution (in regions)
Describes how granular (in regions) geospatial data is in the dataset.
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Indigenous Community Permission
Who holds the Indigenous Community Permission. Who to contact regarding access to a dataset that has data about Indigenous communities.
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Community Permission
Community permission (who gave permission).
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The Indigenous communities the dataset is about
Indigenous communities from which data is derived.
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Number of data rows
If tabular dataset, total number of rows.
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Number of data columns
If tabular dataset, total number of unique columns.
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31 |
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Number of data cells
If tabular dataset, total number of cells with data.
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Number of data relations
If RDF dataset, total number of triples.
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Number of entities
If RDF dataset, total number of entities.
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Number of data properties
If RDF dataset, total number of unique properties used by the triples.
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Data quality
Describes the quality of the data in the dataset.
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Metric for data quality
A metric used to measure the quality of the data, such as missing values or invalid formats.
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