A Dark Past: The History of Lead in Drinking Water and Public Health
- Published:
- Updated: December 16, 2024
Summary
The Dark History of Lead in Drinking Water
- Lead pipes were historically used for their durability despite the known health risks.
- Lead exposure causes neurological damage, developmental delays, and other serious health issues.
- Regulations like the Safe Drinking Water Act were established in the 1970s, but lead exposure remained a threat.
Lead is a dangerous metal with a long and grim history of being employed in everything from paint to water systems. Lead, which has been a killer of human health for hundreds of years, remained used in drinking water because it was corrosion resistant and cheap. That’s caused widespread lead contamination of drinking water, and grave health problems in people who drink it.
The Use of Lead Pipes for Drinking Water
The greatest lead sources of contamination in water is lead pipes. Lead, a hard and malleable metal, was employed in pipes for hundreds of years for water lines. Lead pipes circulated water for drinking in many of the world’s cities, and they were in use into the 20th century. Drinking water from lead pipes was not good because lead is a heavy metal that can leach into the water, introducing lead. Though lead exposure is harmful, for decades lead pipes were used for water supplies, and millions of people were exposed to the metal.
The Dangers of Lead Exposure in Drinking Water
Lead’s threat to drinking water is old news. Lead is a toxic heavy metal that can be dangerous for your health, causing you neurological problems, delayed development and behavioural issues. Additionally, lead use can cause high blood pressure, cardiovascular disease and stroke. This is especially concerning for lead contamination in water, because this could be over many years, as the lethal metal slowly dissolves in the water from lead pipes or other plumbing systems. This can be long-term exposure with adverse health effects.
The Regulation of Lead in Drinking Water
In spite of the risks of lead in water, lead in water wasn’t regulated until the 1970s to reduce the levels of lead in water. The Safe Drinking Water Act of 1974 set the first national water drinking water standards – including limits on how much lead can be added to water. This was a key component in safeguarding public health, but it was years before the risks of lead exposure became well understood and managed.
The Flint Water Crisis
The most recent, and highly publicised, instance of lead in drinking water is the Flint water crisis. In 2014, Flint in Michigan switched from Lake Huron to the Flint River as its drinking water. The new water, though, was extremely corrosive, and the lead pipes in the city’s water system leaked lead into the drinking water. Thousands of citizens were poisoned with lead, and the Flint water crisis was a national news story. This crisis gave people a heads-up that lead in our drinking water was still a threat, and we must remain vigilant and act to save public health.
The Ongoing Threat of Lead in Drinking Water
But the Flint water crisis is far from unique, and lead in drinking water is a threat to health in many parts of the world. Lead pipes are still buried in a lot of homes, and they’re a big lead source of drinking water contamination. Other lead sources, like lead contamination of soil or industrial pollutants, can also lead water. This persistence of the lead risk in water means more must be done to maintain public health including replacement of lead pipes, better water treatment, and surveillance of water quality.
Can Lead in Drinking Water Be Treated?
Lead in drinking water can be treated, but the most effective way to reduce lead exposure is to remove the source of the contamination. This can include replacing lead pipes, improving water treatment, and monitoring water quality.
If lead is present in drinking water, there are several treatment options that can be used to reduce lead levels, including:
- Activated carbon filtration: Activated carbon filtration can be used to remove lead from drinking water. This method uses activated carbon to adsorb lead and other contaminants from the water. Activated carbon filtration can be an effective way to reduce lead levels in drinking water, but it may not remove all forms of lead.
- Reverse osmosis: Reverse osmosis is a treatment method that uses a semi-permeable membrane to remove contaminants from water, including lead. Reverse osmosis can be an effective way to reduce lead levels in drinking water, but it may not be suitable for all types of water systems.
- Ion exchange: Ion exchange is a treatment method that uses ion exchange resin to remove lead and other contaminants from water. Ion exchange can be an effective way to reduce lead levels in drinking water, but it may not remove all forms of lead.
- Distillation: Distillation is a treatment method that involves heating water to create steam, which is then condensed back into water, leaving behind contaminants, including lead. Distillation can be an effective way to reduce lead levels in drinking water, but it may not be suitable for all types of water systems.
It is important to note that not all treatment methods are effective for removing all forms of lead from drinking water, and some methods may not be suitable for all types of water systems. It is important to work with a water testing professional to determine the best treatment method for your specific situation.
What Can Be Done to Protect Public Health from Lead in Drinking Water?
There are a few things we can do to ensure the public is protected against lead contamination of drinking water: lead pipe replacement, water treatment upgrades, water quality monitoring and education. You can eliminate the exposure to lead by replacing lead pipes with copper or plastic pipes, which are much safer alternatives. Adding chemicals to the water and using more sensitive detection and removal technologies also will lower the chances of lead. Monitoring water quality is important by testing regularly and by using sensors and monitoring equipment for lead and other contaminant in water. Last but not least, it is critical to educate the public on the risk of lead in drinking water and how it can be safely avoided through education and public outreach.
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