On April 1, 2026, NASA‘s Artemis II mission launched from Kennedy Space Center, carrying four astronauts on a 10-day journey around the Moon—the first crewed lunar mission since Apollo 17 in 1972 .
But just hours into the flight, something unexpected happened. A warning light on the Orion capsule’s control panel started flashing. The problem wasn‘t the propulsion system, the life support, or the heat shield. It was the toilet.
The “Universal Waste Management System” (UWMS)—the spacecraft’s toilet—had malfunctioned. The fan that controls urine collection had jammed .
Mission specialist Christina Koch worked overnight with guidance from NASA mission control to fix the lunar loo. After several hours, she succeeded. “Happy to report that toilet is go for use,” mission control radioed back .
But the incident raises an obvious question: why is building a space toilet so difficult that it costs $23 million to develop?
The $23 Million Price Tag: What It Actually Covers
First, a clarification: NASA didn‘t spend $23 million on a single toilet seat. The $23 million figure represents the total research and development cost of the UWMS program, announced by NASA in September 2020 .
The UWMS was designed as a “universal” system that could be integrated into multiple spacecraft and life support systems. One unit was sent to the International Space Station (ISS) in 2020 for testing. Another unit was installed in the Orion spacecraft for the Artemis II mission .
According to NASA’s 2020 announcement, the UWMS is 65 percent smaller and 40 percent lighter than the toilet currently in use on the ISS . That reduction in size and weight is critical for deep space missions, where every kilogram adds to fuel costs and mission complexity.
The toilet was developed using 3D-printed titanium components, including a dual-fan separator designed by Collins Aerospace to control airflow . The use of titanium—a corrosion-resistant, durable material—was intended to reduce maintenance needs and ensure reliability over long-duration missions .
Why a Space Toilet Is So Difficult to Build
The difficulty of designing a space toilet comes down to one fundamental problem: no gravity.
On Earth, toilets use gravity to pull waste away from the body and into plumbing systems. In microgravity, that doesn‘t work. Waste doesn’t “fall”—it floats.
Space toilets solve this problem using air flow. A fan creates suction that pulls urine and feces away from the astronaut‘s body and into the proper receptacles . Here’s how the UWMS works:
For urine: Astronauts use a funnel connected to a hose. The air flow pulls the liquid into the system. On longer missions like ISS expeditions, the urine is pre-treated with chemicals and recycled into water. On shorter missions like Artemis II, the urine is simply stored or vented into space .
For feces: A bag-lined toilet seat uses air suction to pull solid waste into a container. The waste is sealed in plastic bags, stored in a metal container, and returned to Earth after the mission. It is not vented into space .
The UWMS also includes an automatic air flow start feature that activates when the toilet lid is lifted—a small innovation that helps with odor control .
The Apollo Era: Plastic Bags and No Privacy
To understand why the UWMS is considered a breakthrough, it helps to look at what came before.
During the Apollo missions of the 1960s and 1970s, there were no toilets on spacecraft. Astronauts urinated into condom-like collection bags and defecated into plastic bags . There was no separate space for this activity—astronauts had to relieve themselves in front of their colleagues. This method was only feasible because all Apollo crew members were male .
The situation was not just embarrassing—it was also hazardous. During Apollo 8, a “turd floated through the air” inside the capsule . Urine collection bags sometimes leaked. The lack of proper waste management was a persistent problem that NASA engineers knew they needed to solve.
The UWMS represents a dramatic improvement. For the first time on a lunar mission, the toilet is enclosed in a “hygiene bay”—a compartment under the floor with a door or privacy curtain . Canadian astronaut Jeremy Hansen, an Artemis II mission specialist, described it in a video as “the one place that we can go on our mission where we can feel like we‘re alone for a moment” .
The Artemis II Malfunction: What Actually Happened
So why did this $23 million, decade-in-development toilet malfunction just hours into the mission?
According to NASA officials, the problem was a controller issue that caused the urine collection fan to jam . NASA flight operations director Norm Knight told reporters that the fan was “stuck,” and the crew had to resort to using emergency bags for urination while the system was being repaired .
Fortunately, the fecal collection system remained operational throughout. Astronaut Christina Koch, working with guidance from mission control, was able to implement a fix. After several hours, she radioed back: “Houston, Integrity, good checkout” .
Mission control responded with a somewhat euphemistic recommendation: “We do recommend letting the system get to operating speed before donating fluid, and then letting it run a little bit after donation” .
The fact that a toilet malfunction occurred on the first crewed test flight is not entirely surprising. The UWMS is complex hardware operating in an extreme environment. NASA’s own technical documentation acknowledges that “technical progress continues to be made with each On-Orbit operation” .
Beyond the Toilet: The Bigger Engineering Challenge
The UWMS is not just a toilet—it‘s a life support system. On long-duration missions, waste management is directly tied to water recycling, air quality, and crew health.
On the ISS, NASA recycles about 90 percent of all water-based liquids, including urine and sweat . Astronaut Jessica Meir famously put it this way: “Today’s coffee is tomorrow’s coffee” .
The UWMS was designed with this closed-loop philosophy in mind. On platforms like the space station, it feeds pre-treated urine into a regenerative system that recycles water for further use. For shorter missions like Artemis II, it simply stores waste for disposal .
Looking further ahead, NASA’s goal is to reach 98 percent recycling rates before the first human missions to Mars, which will last approximately two years with no opportunities to resupply water .
The “Boring” Technology That Matters
The Artemis II toilet malfunction might seem like a trivial or even comedic story. But it reveals something important about the nature of space exploration.
For decades, public attention has focused on the dramatic elements of spaceflight: rocket launches, lunar landings, spacewalks. But the success of long-duration missions depends just as much on the “unsexy” systems—life support, waste management, water recycling—that keep humans alive and healthy in extreme environments.
As the 36Kr analysis notes, "The core of the next-generation space economy is not just 'getting there,' but 'living there.'"
The $23 million toilet is not a joke. It is a critical piece of infrastructure that will enable humans to live and work beyond Earth for extended periods. And like any complex system operating in an unprecedented environment, it requires testing, iteration, and the occasional in-flight repair.
When Christina Koch fixed the UWMS, she wasn‘t just unclogging a toilet. She was demonstrating the kind of problem-solving capability that will be required when astronauts are millions of miles from Earth, with no mission control to call for help.
What Comes Next
As of mission day 2, the toilet was back in operation. The crew continued their journey toward the Moon, scheduled to reach their destination on April 6 and return to Earth with a Pacific Ocean splashdown on April 10 .
The Artemis II mission remains on track to achieve its primary objectives: testing the Orion spacecraft’s life support and propulsion systems in deep space, and paving the way for Artemis III—the first crewed lunar landing since Apollo.
But the toilet malfunction serves as a reminder that in space exploration, no detail is too small. The $23 million, decade-long effort to build a better space toilet is not an absurdity. It is a necessity.
And when future astronauts travel to Mars, living and working in confined spacecraft for years at a time, they will be grateful that engineers spent the time and money to get the toilet right.