The bacteriological quality standards are specified in Schedule A of the Drinking Water Protection Regulation (DWPR) which is shown in the table below:
Schedule A - Water Quality Standards for Potable Water (sections 2 and 9):
| Parameter | Standard |
| Fecal coliform bacteria | No detectable fecal coliform bacteria per 100 ml |
| Escherichia coli | No detectable Escherichia coli per 100 ml |
Total coliform bacteria: (a) 1 sample in a 30 day period | No detectable total coliform bacteria per 100 ml |
Total coliform bacteria: (b) more than 1 sample in a 30 day period | At least 90% of samples have no detectable total coliform bacteria per 100 ml and no sample has more than 10 total coliform bacteria per 100 ml |
For monitoring mineral content, chemical samples are collected from both the source water and the treated water. Comparing the results for a chemical parameter will show the effect of treatment in reducing/changing the concentration of that parameter. This is especially important when monitoring chemical parameters linked to adverse health effects. You can find the Maximum Acceptable Concentration (MAC) specified in the Guidelines for Canadian Drinking Water Quality for items such as nitrates, uranium, arsenic, pesticides, etc. The regional health authority has a list of baseline chemical parameters that must be tested for all water sources. Comprehensive chemical tests should be done about every 3 to 5 years on all water systems.