Simple ways to prevent contamination – Health Canada limits the lead content in drinking water at 10 parts per billion in a sample of water. Therefore, the municipal water supply contains almost no lead. So, how does occur the lead contamination and how can we protect ourselves?
Harmful effects on health despite many advantages
Malleable, ductile, affordable and easy to solder, lead is used in plumbing since antiquity. However, it is very harmful to human health. Some historians even pretend that lead contamination could be partly responsible for the fall of the Roman Empire!
A small amount of lead in the blood affects human health to varying degrees. Between 10 and 15 micrograms of lead per deciliter of blood can cause harmful effects on children neurobehavioral and cognitive systems and the developing fetus while a rate of more than 40 micrograms may interfere with the production of red blood cells. Cases of lead poisoning, at very low doses, are difficult to identify, and that is why very few are listed in Canada.
Contamination occurs within buildings. Lead can be found in some connections, plumbing and welding accessories. It mainly occurs when water remains stagnant for more than 6 hours in lines where there is presence of lead, which is then dissolved in water. Hotter is the water, higher is its dissolving power.
Older homes, especially those built before 1955, are more at risk because water connections were then made of lead. Since then, the requirements governing the use of lead in plumbing and standards are constantly evolving. Recently, in 2014, the lead concentration in faucets and plumbing fixtures for the distribution of water for human consumption was reduced to 0.25%.
Domestic equipment’s exist to decontaminate water; including carbon filters installed directly on the tap, reverse osmosis water filtration system and distillation units. Some of these equipment are expensive and require regular maintenance.
It is recommended to perform these simple things that make a difference:
- Let the water run a few minutes after a disuse period of 6 hours;
- Use cold water for cooking;
- Regularly clean the faucet aerator.
How to identify a lead connection
Find the water main shut-off valve of the building. Then observe the pipe: Lead is gray, it has no resonance and it gets scratched easily. It does not attract a magnet.
Feel free to call a specialist to identify plumbing lines at risk!
Source: Health Canada