Yes, 

tapping water from the Martian atmosphere is considered a potential, albeit supplementary, method for supplying water to future human missions and colonies, using technologies that capture the existing atmospheric water vapor. 

Feasibility and Technology

The Martian atmosphere contains a small but consistent amount of water vapor, typically around 0.03%. The primary challenges are the atmosphere’s thinness and the extremely low concentration of water vapor. 

Technologies being researched for “tapping” this resource primarily rely on In-Situ Resource Utilization (ISRU) methods: 

• Adsorption Systems: These systems use materials like zeolites that absorb water vapor directly from the atmosphere when air is pumped through them. The water is later released by heating the material, condensed, and collected as liquid water or ice.
• Atmospheric Resource Recovery Systems (MARRS): Concepts like the Mars Atmospheric Resource Recovery System are designed to extract water during the process of filtering air for breathable oxygen, making it an integrated life-support technology. 

Limitations

While feasible, atmospheric extraction is not expected to be the primary water source for a self-sufficient colony. 

• Low Yield: The amount of water that can be extracted is relatively small (estimated around 0.02 kg/hr per person) compared to the needs of a growing colony, which extend beyond drinking water to include plant growth, manufacturing, and habitat maintenance.
• Site Dependence: The viability and efficiency of extraction technologies are highly dependent on location and local atmospheric conditions, which fluctuate hourly and seasonally. 

The Main Source

Due to the low atmospheric yield, the most viable long-term strategy for obtaining large amounts of water on Mars is extracting it from subsurface ice deposits and hydrated minerals in the Martian regolith (soil). The atmospheric water tapping methods are likely to provide supplementary supplies or contingency water in remote locations. 

Water extraction from regolith

….The water available for extraction from the martian regolith is site dependent. At higher and lower latitudes, the majority of the water is found in icy soils and permafrost. Around the equator, most of the water content is found in hydrated minerals. There is some speculation that more water exists deeper in the regolith that may be available if a method is developed to drill down to it (Clifford, 1993), but at present this solution is not proven. But even near the equator where the water……

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