In honor of World Toilet Day, test your portable sanitation knowledge with this quiz. The information was culled from the PSAI, UN Water and WHO. How does your knowledge stack up? The answer key is provided below the image after the quiz questions.

1. Question: How many people live without safe access to toilets globally?
   1. 1 billion people
   2. 3.5 billion people
   3. 3.5 million people
   4. 100 million people
2. Question: Question: How many gallons of water are used for a weekly restroom pumpout? (Account for charge, waste and hand-wash graywater.)
   1. 9 gallons
   2. 17 gallons
   3. 22 gallons
   4. 27 gallons
3. Question: How many gallons of water does the average toilet use per flush?
   1. 1.3 gallons
   2. 3.6 gallons
   3. 5 gallons
   4. 1.6 gallons
4. Question: How many portable restrooms are there estimated to be globally?
   1. 2 million
   2. 3.4 million
   3. 3.7 million
   4. 7.7 billion
5. Question: Open defecation is still common practice for how many people worldwide?
   1. 826 million
   2. 268 million
   3. 628 million
   4. 419 million
6. Question: What is the PSAI estimated number of gallons of freshwater saved globally per day via portables?
   1. 125 million
   2. 131.24 million
   3. 187.5 million
   4. All of the above
7. Question: How many schools globally do not offer any sort of restroom facilities?
   1. One-third
   2. One-half
   3. Two-thirds
   4. Three-fifths

Answer key

1. B. 3.5 billion people live without safe access to toilets according to UN Water.
2. C. According to the PSAI, the average weekly restroom pumpout uses 22 gallons of water, accounting 5 gallons for charge, 15 gallons waste and 2 gallons hand-wash graywater.
3. D.Today, the average toilet uses 1.6 gallons of water according to the PSAI. Some high-efficiency toilets will use 1.3 gallons, toilets manufactured in the 1980s averaged 3.6 gallons, and toilets made prior to the ’80s averaged 5-7 gallons per flush.
4. B. According to the PSAI, in 2014 the estimated number of portable restrooms globally was 3.4 million.
5. D. According to the WHO and UN, 419 million individuals worldwide still practice open defecation, meaning waste is not being treated or even captured.
6. D. The PSAI estimates that at a 67% utilization rate 125 million gallons of water are saved, while saving 131.24 million gallons at a 70% utilization rate and 187.5 million gallons at 100%.
7. A. One-third of all schools globally do not provide restroom facilities or portable sanitation to their students. Additionally, an estimated 900 million students lack access to hand-washing facilities.