This new document identifies reductions in IQ as the critical effect of lead, with a proposed MAC of 0.005 mg/L (5 µg/L) based on analytical achievability. The existing guideline for lead, last updated in 1992, based its maximum acceptable concentration (MAC) of 0.01 mg/L (10 µg/L) on a provisional tolerable weekly intake of lead established by the World Health Organization (WHO) at a level that showed no increase in blood lead levels and thus no expected increase in health risks. The purpose of this consultation is to solicit comments on the proposed guideline, on the approach used for its development and on the potential economic costs of implementing it, as well as to determine the availability of additional exposure data. The Federal-Provincial-Territorial Committee on Drinking Water (CDW) has assessed the available information on lead with the intent of updating the drinking water guideline. Appendix B: Provincial and territorial anticipated impacts.10.3 Comparison of cancer and non-cancer risk assessments.9.2.5 Reproductive and developmental toxicity.9.2.3 Long-term exposure and carcinogenicity.9.1.3 Developmental and reproductive toxicity.9.1.2 Subchronic and chronic toxicity and carcinogenicity.7.1.2.6 Mitigation strategy for impacts resulting from treatment.7.1.2.5 Mitigation strategy for distribution and plumbing systems.7.1.2.4 Mitigation strategy for lead service lines.7.1.2.2 Correlation between particulate lead and iron.7.1.2 Distribution system considerations.7.0 Treatment technology and distribution system considerations.5.7 Multi-route exposure through drinking water.5.1.2 Sampling to assess exposure to lead from drinking water.5.1.1 Canadian exposure to lead from drinking water.4.0 Identity, use and sources in the environment.3.1.2 Monitoring for schools, multi-dwelling residences and large buildings.3.1.1 Monitoring for residential dwellings.

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