| #Q001 | operational | treatment | recommended | Maintain ALARA Concentrations | drinking water | Utilities should make every effort to maintain concentrations as low as reasonably achievable (or ALARA) without compromising the effectiveness of disinfection. | | high |
| #Q002 | prohibition | health | mandatory | Disinfection Effectiveness Protection | drinking water | It is critical that any method used to control levels of haloacetic acids must not compromise the effectiveness of disinfection. | When using methods to control levels of haloacetic acids | high |
| #Q003 | operational | health | recommended | ALARA Effort Recommendation | drinking water | The Federal-Provincial-Territorial Committee on Drinking Water also recommends that every effort be made not only to meet the guideline, but to maintain concentrations of haloacetic acids as low as reasonably achievable. | | high |
| #Q004 | administrative | operational | recommended | Guidance on Implementation | drinking water | Specific guidance related to the implementation of this guideline should be obtained from the appropriate drinking water authority in the affected jurisdiction. | | high |
| #Q005 | design | treatment | recommended | ALARA Principle for Upgrades | drinking water | Given the limited information on the risks and uncertainties associated with other CDBPs, it is recommended that treatment plants strive to maintain HAA levels as low as reasonably achievable (ALARA) without compromising disinfection. This should also be considered when changes, upgrades or expansions are made to the treatment plants or distribution systems. | When changes, upgrades or expansions are made to the treatment plants or distribution systems | high |
| #Q006 | operational | health | mandatory | Review of Disinfection Strategy Changes | drinking water | Any effort aimed at reducing disinfection by-products, such as changing disinfection strategies, needs to be considered in light of changes in water quality that may inadvertently increase the levels or leaching of other contaminants, such as lead, in the distributed water. | When aiming to reduce disinfection by-products or changing disinfection strategies | high |
| #Q007 | monitoring | reporting | recommended | Minimum HAA Monitoring Frequency | drinking water | At a minimum, quarterly monitoring of treated water from surface water and groundwater sources is recommended for total HAAs. | | high |
| #Q008 | monitoring | reporting | guidance | Increased Monitoring Frequency | drinking water | Increased frequency of monitoring may be required for facilities using surface water sources during periods when water characteristics are more favourable to the formation of by-products, which will vary according to the specific system. | Facilities using surface water sources during periods when water characteristics are more favourable to the formation of by-products | high |
| #Q009 | monitoring | reporting | recommended | Monitoring Sample Locations | drinking water | Since total HAA concentrations vary within and between distribution systems, depending on different factors, including water quality characteristics (e.g., HAA precursors, pH, season, temperature) and treatment conditions (e.g., disinfectant type, disinfectant dose, contact time), it is recommended that monitoring samples be taken at the water treatment plant and at points in the distribution system where historical data show the highest HAA concentrations. | | high |
| #Q010 | monitoring | reporting | recommended | Monitoring Without Historical Data | drinking water | Where historical data are not available, program should be put in place to monitor HAA levels in the middle and extremities of the distribution system. | Where historical data are not available | high |
| #Q011 | monitoring | operational | recommended | Targeted Monitoring Areas | drinking water | Areas with extremely low or no disinfectant residual should be avoided, but areas where disinfectant residuals are significantly lower than the system average because of a long residence time (e.g., dead ends, low flow areas) should be targeted. | | high |
| #Q012 | monitoring | reporting | guidance | Reduction of Monitoring and Reporting | drinking water | Monitoring/reporting may be reduced if drinking water monitoring does not show elevated levels of disinfection by-products within the distribution system. | If drinking water monitoring does not show elevated levels of disinfection by-products within the distribution system | high |