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Canada's Premier At-Home Water Testing & Reporting Solution

HOW WE GRADE YOUR WATER SUPPLY SOURCE

The Canadian Water Quality Index (CWQI) is an effective method to rate the water quality and determine its suitability for drinking purposes. CWQI measures a wide variety of parameters of water quality and then cumulatively translates them into one score.

The CWQI method requires a group of parameters that have drinking water objectives that have been set either by the Canadian government or a province to ensure that the water intended for human consumption.

Health-Related Standards: shall not contain disease-causing organisms or unsafe concentrations of toxic chemicals.

Aesthetic Objectives: should be aesthetically acceptable and palatable.

Operational Guidelines: should not contain undesirable concentrations of parameters that, if not controlled, may negatively affect the efficient and effective treatment, disinfection, and distribution of water

The CWQI calculates three factors based on these objectives:

  1. the number of parameters that fail their objective,
  2. the proportion of samples that fail their objectives,
  3. the magnitude of any failures

HOW TO READ YOUR REPORT CARD

A summary of results comes in two charts. First one shows CWQI and the second one shows which and how parameters influence CWQI.

The colouring system is represented by:

  • Green — parameters that have a concentration that is below the objectives/standards
  • Red — parameters that have a concentration that is above the objectives/standards

Fair

68

Parameter 1
Parameter 2
Parameter 3
Parameter 4
Parameter 5
Parameter 6
Parameter 7
Parameter 8

The sample example provided has a CWQI of 68 (out of 100). The quality is FAIR.

RATING
CWQI Values
What Do These Values Mean?
Excellent
95-100
Water quality is protected with a virtual absence of impairment; conditions are very close to pristine levels. These index values can only be obtained if all measurements meet recommended guidelines virtually all the time
Very Good
89-94
Water quality is protected with a slight presence of impairment; conditions are close to pristine levels.
Good
80-88
Water quality is protected with only a minor degree of impairment; conditions rarely depart from desirable levels.
Fair
65-79
Water quality is usually protected but occasionally impaired; conditions sometimes depart from desirable levels.
Marginal
45-64
Water quality is frequently impaired; conditions often depart from desirable levels.
Poor
0-44
Water quality is almost always impaired; conditions usually depart from desirable levels.

The My Water Quality Report Card also provides a detailed summary of the parameters tested, why each parameter is important, and treatment options. This information can be found in Appendix A of each report card.

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