Clean Water Act (CWA) - Vulnerability Score

To show the relative vulnerability of the aquifers that supply water to the York Region municipal wells.

Shows the Vulnerability Scoring (VS) zones in accordance with the Technical Rules for the Clean Water Act (issued in December 2008) for all municipal well fields in York Region. VS values of 2-10 are provided within Wellhead Protection Areas (WHPA) A, B, C and D (which represent the 100 metre, 0-2 year, 2-5 year and 5-25 year zones respectively), as based on scoring rules provided by the Ministry of the Environment (MOE) in the Clean Water Act. The figures and the final report present results of data compilation and computer simulations of a complex geologic setting. As outlined in the final report, data errors and data gaps are likely present in information provided to the consultant (EarthFX Inc.). In addition, computer models represent a simplification of the actual geologic and hydrogeologic conditions, and are subjected to simplifying assumptions. The data has been created by EarthFX Inc. The geologic and hydrogeologic data used as input into the numerical modelling procedure has been provided by various sources, including the MOE water-well records, previous consulting/research reports, and York Region.

Please refer to the Clean Water Act approved symbology when using this data. (http://www.ontario.ca/environment-and-energy/mapping-symbology-clean-water-act)

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Additional Info

Field Value
Last Updated March 24, 2026, 22:37 (UTC)
Created March 24, 2026, 22:37 (UTC)
Domain / Topic
Domain or topic of the dataset being cataloged.
Title
Title for the Dataset.
Clean Water Act (CWA) - Vulnerability Score
Description
A description of the dataset.

To show the relative vulnerability of the aquifers that supply water to the York Region municipal wells.

Shows the Vulnerability Scoring (VS) zones in accordance with the Technical Rules for the Clean Water Act (issued in December 2008) for all municipal well fields in York Region. VS values of 2-10 are provided within Wellhead Protection Areas (WHPA) A, B, C and D (which represent the 100 metre, 0-2 year, 2-5 year and 5-25 year zones respectively), as based on scoring rules provided by the Ministry of the Environment (MOE) in the Clean Water Act. The figures and the final report present results of data compilation and computer simulations of a complex geologic setting. As outlined in the final report, data errors and data gaps are likely present in information provided to the consultant (EarthFX Inc.). In addition, computer models represent a simplification of the actual geologic and hydrogeologic conditions, and are subjected to simplifying assumptions. The data has been created by EarthFX Inc. The geologic and hydrogeologic data used as input into the numerical modelling procedure has been provided by various sources, including the MOE water-well records, previous consulting/research reports, and York Region.

Please refer to the Clean Water Act approved symbology when using this data. (http://www.ontario.ca/environment-and-energy/mapping-symbology-clean-water-act)
Tags / Keywords
Keywords/tags categorizing the dataset.
Format (CSV, XLS, TXT, PDF, etc)
File format of the dataset.
Dataset Size
Dataset size in megabytes.
0.08
Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
Published Date
Published date of the dataset.
2019-05-17
Time Period Data Span (start date)
Start date of the data in the dataset.
Time Period Data Span (end date)
End date of time data in the dataset.
GeoSpatial Area Data Span
A spatial region or named place the dataset covers.
Field Value
Access category
Type of access granted for the dataset (open, closed, service, etc).
public
License
License used to access the dataset.
License not specified
Limits on use
Limits on use of data.
Location
Location of the dataset.
https://insights-york.opendata.arcgis.com/datasets/york::clean-water-act-cwa-vulnerability-score
Data Service
Data service for accessing a dataset.
Owner
Owner of the dataset.
YorkMunicipalGovt
Contact Point
Who to contact regarding access?
The Regional Municipality of York
Contact Point Email
The email to contact regarding access?
Publisher
Publisher of the dataset.
The Regional Municipality of York
Publisher Email
Email of the publisher.
Author
Author of the dataset.
YorkMunicipalGovt
Author Email
Email of the author.
Accessed At
Date the data and metadata was accessed.
2025-08-01
Field Value
Identifier
Unique identifier for the dataset.
25a6dd5b75494329b312a10ca4b80ce2
Language
Language(s) of the dataset
English
Link to dataset description
A URL to an external document describing the dataset.
https://insights-york.opendata.arcgis.com/datasets/york::clean-water-act-cwa-vulnerability-score
Persistent Identifier
Data is identified by a persistent identifier.
Globally Unique Identifier
Data is identified by a persistent and globally unique identifier.
Contains data about individuals
Does the data hold data about individuals?
Contains data about identifiable individuals
Does the data hold identifiable data about individual?
Contains Indigenous Data
Does the data hold data about Indigenous communities?
Portal Type
Platform type of the source portal.
Field Value
Version
Version of the datatset
None
Source
Source of the dataset.
None
Version notes
Version notes about the dataset.
Is version of another dataset
Link to dataset that it is a version of.
Other versions
Link to datasets that are versions of it.
Provenance Text
Provenance Text of the data.
The Regional Municipality of York
Provenance URL
Provenance URL of the data.
Temporal resolution
Describes how granular the date/time data in the dataset is.
GeoSpatial resolution in meters
Describes how granular (in meters) geospatial data is in the dataset.
GeoSpatial resolution (in regions)
Describes how granular (in regions) geospatial data is in the dataset.
Field Value
Indigenous Community Permission
Who holds the Indigenous Community Permission. Who to contact regarding access to a dataset that has data about Indigenous communities.
Community Permission
Community permission (who gave permission).
The Indigenous communities the dataset is about
Indigenous communities from which data is derived.
Field Value
Number of data rows
If tabular dataset, total number of rows.
186
Number of data columns
If tabular dataset, total number of unique columns.
6
Number of data cells
If tabular dataset, total number of cells with data.
1116
Number of data relations
If RDF dataset, total number of triples.
Number of entities
If RDF dataset, total number of entities.
Number of data properties
If RDF dataset, total number of unique properties used by the triples.
Data quality
Describes the quality of the data in the dataset.
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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