Looming changes to Health Canada’s acceptable concentration levels of lead in drinking water could see a wash of city homes creep above the recommended level, Epcor warned city council’s utility committee Thursday. Presently, it’s considered safe to have up to 10 micrograms per litre in drinking water. But Epcor officials said Thursday that the federal health agency is signalling it will lower that level to five micrograms per litre, a change that will affect more than 30,000 Edmonton homes.