| #Q001 | design | treatment | guidance | Pretreatment Determination | drinking water | It is important to determine what, if any, pretreatment is required. | Applies when selecting an appropriate treatment process for a specific water supply. | high |
| #Q002 | operational | health | recommended | ALARA Principle for Arsenic | drinking water | Because arsenic is a human carcinogen, every effort should be made to maintain levels in drinking water as low as reasonably achievable. | | high |
| #Q003 | administrative | unknown | mandatory | Technology Monitoring and Guideline Revision | drinking water | Since treatment technology considerations are a limiting factor in establishing a guideline for arsenic in drinking water, Health Canada and the Federal-Provincial-Territorial Committee on Drinking Water will continue to monitor new developments in treatment technologies to revise and update the guideline and the guideline technical document as required. | | high |