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Magnetocaloric refrigeration is an emerging technology that shows the potential to replace traditional vapor-compression systems. Considering water is a common heat exchange fluid in magnetocaloric devices, this study focuses on the stability of the room temperature magnetocaloric effect in La(Fe_xCo_ySi_1-x-y)₁₃ alloys. Material characterization was performed on both milled and ground La(Fe_0.84Co_0.07Si_0.08)₁₃ powders stored in water and air for up to 14 days. Experimental results show that the powders grounded after storing in water, and air retain sharp magnetovolume transitions with entropy change (ΔS) values of 10.3 J/Kg.K and 7.1 J/Kg.K respectively (μH= 3 T), while the milled powders exhibit low ΔS values. The milled powders stored in air show slightly broadened transitions, whereas those stored in water show significantly broadened transitions with enhanced magnetization that can be attributed to the ferrimagnetic Fe₃O_4. Overall, our results indicate that ground La(Fe_xCo_ySi_(1-x-y))₁₃ powders show promising MCE effects after exposure to air and water, while properties of milled powder deteriorate rapidly.