Yes, human-to-human transmission of H1N1 virus can occur. Even at your pool.
Transmission is thought to occur in the same way as seasonal flu occurs in people, which is mainly person-to-person transmission through coughing or sneezing of people infected with the influenza virus.
From the NSPF: What actions should pool operators take at their aquatic facility?
Viruses are transmitted in areas outside of pool water and other surfaces such as restrooms, door handles, and chairs. Follow CDC recommendations of 10% bleach solution to wipe these and other features down. For guidance on cleaning up bodily fluids on inanimate objects download: