Visualize historical trends

Select a Water Station and Substance to View Data Trends for the Past 20 Years (Data availability may vary).

Info Icon Station:
A "station" is a designated monitoring site used to collect data on water quality, quantity, and ecosystem health.

Watershed:
A "watershed" refers to a geographic area where all the water, whether from rainfall, snowmelt, or other sources, drains into a common outlet such as a river, lake, or ocean.

Note: Click the button below to export a consolidated report displaying trends for a specific station across all relevant substances/chemicals.




Generate Heat Map

Select Year and Indicator to Generate Heat Map.

Select target indicator

DeX-Terity is an advanced web-based platform that provides comprehensive insights into regional water quality. It enables users to explore detailed watershed and station-level data, visualize historical trends, and assess potential impacts using machine learning-based scenario modeling. By integrating multiple data sources and analytical tools, DeX-Terity supports informed decision-making for sustainable water management.

How to use this tool?
Active Stations
Inactive Stations

Historical data and trends are derived from TRCA's Regional Watershed Monitoring Program (up to 2022) and CLOCA's Open Data (up to 2023).


Substance/Chemical

The Confidence Score (ranges from 0% to 100% and a score below 40% is considered 'Low') shown on the graphs reflects the reliability of predictions based on historical data and model insights. It is calculated through a multi-step process, incorporating statistical analysis, feature importance, and machine learning predictions. Higher scores indicate greater confidence in the forecast, helping support informed decision-making and scenario analysis.

Threshold values for Total Phosphorus are based on PWQO water quality guidelines.
Applies to Rivers and Streams.

The Provincial Water Quality Objectives ( PWQO ) are Ontario’s water quality guidelines established to protect aquatic life, recreational water use, and drinking water sources. Developed by the Ontario Ministry of the Environment, Conservation and Parks (MECP), these objectives set concentration limits for various contaminants to maintain water quality and ecosystem health.

Low High

CSV file requirements

The CSV file must contain columns:

For Total Phosphorus (TP) prediction

Mandatory

  • pH
  • 250mLandCover_Natural (ha)
  • DissolvedOxygen (mg/L)
  • Population
  • Chloride (mg/L)
  • Nitrite (mg/L)
  • TotalSuspendedSolids (mg/L)
  • Nitrogen_Kjeldahl (mg/L)

Non-Mandatory

  • Total Rain (mm) -7day Total (mm)
  • Nitrate (mg/L)
  • TotalNitrogen (mg/L)

For Total Nitrogen (TN) prediction

Mandatory

  • Month
  • pH
  • 10mLandCover_Natural (ha)
  • 10mLandCover_AnthropogenicNatural (ha)
  • TotalSuspendedSolids (mg/L)
  • Conductivity (k)
  • TotalPhosphorus (mg/L)
  • Population
  • Chloride (mg/L)
  • Nitrite (mg/L)

For Total Suspended Solids (TSS) prediction

Mandatory

  • mwd_SEWAGE FLOW, MONTHLY TOTAL
  • min_distance_to_upstream_npri_meters
  • ThreeYearsAvg_DissolvedOxygen
  • PriorYear_Total number of farms
  • ThreeYearsAgo_IndsutryAgriculture
  • 10mLandCover_AnthropogenicNatural
  • ThreeYearsAvg_Number of Summerfallow land
  • PriorYear_MEAN_TEMP
  • ThreeYearsAvg_Conductivity
  • watershed_npri_count
Download Spreadsheet Template

Explore your watershed's vital signs

Map Icon

Map

  • Hover over any highlighted region on the map to view detailed information about the corresponding watershed.
  • Click on the location markers to access specific details about water stations.
Trends Icon

Trends & Insights

  • Select a year, water station, and chemical/substance to view trends over the past 20 years for the chosen substance at that particular water station.
Scenario Icon

Scenario Modelling

  • Choose a water station and target indicator (TP, TN, TSS) to view future predictions for the next 20 years.
  • Adjust influencing factors using the sliders to modify scenarios and see updated predictions based on your adjustments.
This website is best viewed on a desktop for full functionality. Some features may not be available on mobile devices.