National Backflow Prevention Day
August 16
About National Backflow Prevention Day
National Backflow Prevention Day takes place every year on 16 August. The day recognises the people and systems that keep contaminants out of clean drinking water, and it draws attention to backflow prevention and cross-connection control across the plumbing and water industries. It was created in the United States to honour the technicians who install, test, and maintain the devices that protect public water supplies.
What is National Backflow Prevention Day?
National Backflow Prevention Day is an annual observance dedicated to backflow prevention, the practice of stopping used or contaminated water from flowing backwards into the clean water supply. Backflow can occur when pressure in a plumbing system changes, allowing pollutants, chemicals, or waste water to be drawn into pipes that carry drinking water. The day was established by Watts Water Technologies and is supported across the plumbing, mechanical, and water-quality sectors. It celebrates the professionals who safeguard water safety, including plumbers, backflow assembly testers, and cross-connection control specialists.
When is National Backflow Prevention Day?
National Backflow Prevention Day falls on Sunday, 16 August 2026. The date is fixed and does not change from year to year, so the observance is always marked on 16 August. The date was chosen deliberately to commemorate a serious backflow contamination event that happened on the same day in 1933.
Why National Backflow Prevention Day Matters
Clean drinking water is something most people take for granted, yet it depends on a network of valves, assemblies, and regular testing that the public rarely sees. A single faulty cross-connection can allow pesticides, industrial chemicals, or sewage to enter a building’s water supply, putting entire communities at risk. The day exists because of a real tragedy: a backflow incident at two hotels near the 1933 Chicago World’s Fair contaminated drinking water with amoebic dysentery, causing around 2,000 illnesses and roughly 98 deaths. That event reshaped plumbing regulation and led directly to the founding of organisations focused on cross-connection control, making the case for why ongoing vigilance still matters today.
How to Get Involved in National Backflow Prevention Day
There are several practical ways to mark the day, whether you work in the trade or simply rely on safe water at home.
- Thank a water professional – Recognise the plumbers, testers, and engineers who maintain backflow assemblies. A simple message of appreciation acknowledges work that protects public health every day.
- Schedule a backflow test – If you own a property with irrigation, a boiler, or a commercial water connection, check whether your backflow preventer is due for its annual test and book a certified tester.
- Learn the basics of cross-connection control – Understanding how backflow happens, through back-pressure or back-siphonage, helps property owners spot risks before they become problems.
- Share information online – Post about the day using its official hashtags and explain to your network why protecting drinking water matters.
- Attend an industry event – Manufacturers and trade bodies run webinars, training sessions, and demonstrations around 16 August each year.
- Review your home plumbing – Avoid common hazards such as leaving a hose submerged in a paddling pool or chemical bucket, which is a classic cause of back-siphonage.
- Support certification and training – Encourage apprentices and colleagues to gain backflow tester certification, helping to address the skills gap in the water-safety workforce.
History of National Backflow Prevention Day
National Backflow Prevention Day was announced in March 2021 by Watts Water Technologies, a company that has worked in water-related technologies for more than a century. The first observance was held on 16 August 2021, and it has been marked annually ever since with the backing of plumbing publications, trade associations, and manufacturers across North America.
The date carries deliberate historical weight. On 16 August 1933, visitors to the Chicago World’s Fair were staying in two hotels that shared a contaminated rooftop water source. A cross-connection allowed amoebic dysentery to spread through the drinking water, leading to roughly 2,000 illnesses and around 98 deaths. The disaster exposed how dangerous unprotected plumbing connections could be and prompted sweeping changes to safe-plumbing regulation.
That 1933 incident also contributed to the founding of the Foundation for Cross-Connection Control and Hydraulic Research, now a division of the University of Southern California, which became a leading authority on backflow assembly standards and testing. National Backflow Prevention Day continues this legacy by keeping the lessons of the past in public view and reminding the industry why standards and testing remain essential.
Noteworthy Facts About National Backflow Prevention Day
- The day was first observed on 16 August 2021, making 2026 the sixth annual observance.
- The 1933 Chicago backflow incident caused an estimated 98 deaths and around 2,000 illnesses.
- Backflow can occur through two main mechanisms: back-pressure, where downstream pressure exceeds supply pressure, and back-siphonage, where a drop in supply pressure pulls water backwards.
- The Foundation for Cross-Connection Control and Hydraulic Research, founded in the aftermath of the 1933 disaster, is now part of the University of Southern California.
- Backflow preventers require regular testing, often annually, to confirm they are working correctly.
Frequently Asked Questions
What is National Backflow Prevention Day?
It is an annual day, held on 16 August, that raises awareness of backflow prevention and cross-connection control, and honours the professionals who protect clean drinking water from contamination.
When is National Backflow Prevention Day in 2026?
National Backflow Prevention Day is on Sunday, 16 August 2026. The date is fixed and is observed on 16 August every year.
Who created National Backflow Prevention Day?
The day was established by Watts Water Technologies in 2021, with support from plumbing and water-industry organisations. The 16 August date commemorates the 1933 Chicago backflow contamination that killed around 98 people.
Spread the Word
Help raise awareness by sharing National Backflow Prevention Day with your friends, family, and followers. Use the hashtags #BackflowPreventionDay and #BackflowPreventionDay2026 on social media. The more people who understand how clean water is protected, the safer our shared water supply becomes.
Related Awareness Days
- Drowning Prevention Week – Another safety-focused observance, highlighting the importance of water safety and preventing avoidable harm.
- National Hydration Day – A reminder of why access to safe, clean drinking water is essential to health.
- World Refill Day – A campaign encouraging people to refill reusable bottles and value clean tap water.
Links
- Visit the official National Backflow Prevention Day page from Watts
- Explore more awareness days at AwarenessDays.com
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