Maximum Contaminant Level
MCL – 0.015 mg/L or ppm
MCLG – zero
WHO Guideline – 0.01 mg/L
Lead is colorless, odorless, and tasteless; the presence of copper in the water can indicate the possible presence of lead. According to the Water Quality Association,
“Studies indicate that nearly all the lead in users’ tap water does not come from the primary water source or from the municipal treatment plant, but is a result of corrosion of lead containing materials that contact water after leaving the treatment plant." 1
Until it was outlawed in 1986, lead solder was used to connect plumbing. Lead may also enter the water supply from outdated water distribution lines. If your home was built prior to 1986 you should be sure to have your water tested for lead. A carbon drinking water filter or reverse osmosis system should eliminate the issue; however, make sure that the system that you choose is certified for lead removal by the WQA or NSF International, as not all systems are qualified for the reduction of lead.
1. World Health Organization. Lead in Drinking Water. [Online] 2016. https://www.wqa.org/learn-about-water/common-contaminants/lead.