| #P001 | design | health | guideline | default allocation factor for drinking water | drinking water | requirement | 20 % | Used in the derivation of drinking water guidelines. Although some exposure data are available, they are considered insufficient to justify modifying the default allocation factor. | | medium |
| #P002 | design | health | guideline | VOC dermal and inhalation exposure significance threshold | drinking water | requirement | >= 10 % | Both the dermal and inhalation routes of exposure for a VOC are considered significant if they contribute at least 10% of the drinking water consumption level. | Applies to volatile organic compounds (VOCs) in multiroute exposure assessments. | high |
| #P003 | design | health | guideline | standard Canadian drinking water consumption rate | drinking water | requirement | 1.5 L/day | Added to the daily litre-equivalent contributions for dermal and inhalation exposures to estimate total exposure. | Standard consumption rate used for general population exposure calculations. | high |