The presence of lead in municipal drinking water is regulated by the MOE. Provincial regulation requires annual lead testing in the water distribution system and sets a health-related drinking water standard of less than 10 micrograms per litre (ug/L), which is equivalent to 10 parts per billion (ppb).
Drinking water standards are established by the MOE based on medical research and consultation with Health Canada.
In addition to monitoring for the presence of lead in the water supply, distribution system and customer tap water, the City of Guelph proactively replaces lead service lines on municipal properties and encourages private property-owners to do the same.
Please bear in mind that Guelph’s water supply and the water in the distribution system has lead levels well below the 10 parts per billion guideline. It is only in homes with lead pipes, lead solder, or with taps that have bronze or brass is there potential for trace amounts of lead to be present in tap water. It is estimated that less than about five per cent of homes in Guelph may have lead services.
A large number of lead services have already been replaced in Guelph, though a small number of lead water services may still remain in use.
Guelph residents with lead service pipes can have their water tested by Guelph Waterworks to determine the lead concentration. If elevated levels are found, short term improvements may be seen by flushing water before consumption or by using a filtration system.
Guelph Waterworks will, in a timely manner, replace lead municipal water services. In the long term it is recommended that customers replace privately owned lead piping with alternatives such as copper or plastic. The City does not pay for replacement of lead services on the privately-owned portion of a homeowner’s property.
Wellington-Dufferin-Guelph Public Health and the City of Guelph assure residents that Guelph’s drinking water is high-quality.
Re-sampling at one property showed a lead level of less than 10 micrograms per litre, meaning the result fell within the MOE’s guideline. Re-sampling at other properties resulted in findings that are similar to the original results.
City staff are planning next steps, are liaising continuously with the MOE and Public Health, and will make more information available when they have this information.
Staff