DWSP DATA

Since it began, DWSP has collected over 4.5 million results at nearly 1500 sample locations in raw water, treated drinking water and water from the distribution system.

• DWSP monitors for over 250 inorganic, organic, and radiological water quality parameters.  The parameters monitored include those that have a health-related Ontario Drinking Water Quality Standard (ODWQS), aesthetic objective, or operational guideline and many more that are unregulated.

How can I Access DWSP Data?

The data collected by DWSP are provided to ministry staff, to other government agencies, municipal partners, academia and the public. 

Data are available to municipal partners using an electronic subscription system or as hard-copy reports. 

Other users can download DWSP data or contact DWSP with specific requests or questions. 

Selected summary data reports are available on the MOE website.         

How are DWSP Data Used?

DWSP data are used to:

• Provide scientific data to support the review of current drinking water quality standards and the development of new standards
• Characterize the quality of drinking water sources
• Monitor levels of chemicals occurring in treated drinking water and water in the distribution systems and to establish trends in drinking water quality
• Identify and track the occurrence of new chemicals and emerging contaminants of concern
• Assess treatment plant operations and their effect on drinking water quality
• Assess and report on the state of Ontario’s municipal drinking water quality.