Are wet floors due to weather conditions or the entry of vehicles containing melting snow subject to 29 CFR 1910.22(a)?

Yes. Wet floors due to water conditions or the entry of vehicles containing melting snow would be subject to 29 CFR 1910.22(a)(2). The first sentence of 29 CFR 1910.22(a)(2) requires floors to be maintained in a clean and, so far as possible, dry condition. Depending on the circumstances, this could require more than regularly scheduled housekeeping.

The second sentence of 1910.22(a)(2) addresses requirements where wet processes are used. A wet floor due to weather conditions would not constitute a wet process. A wet process involves a location where liquid is used to water, wash, soften, cook, or cool a product, and part or all of the liquid residue runs into drains or onto the walking and working surfaces.