How do you know if small cracks in a new concrete pool deck are serious?

All concrete cracks, there's no foolproof way to avoid them. As long as they do not penetrate the gunite shell of the pool they are simply cosmetic.

Shelley Hill Pools has over 40 years of experience providing in ground, concrete, indoor, built in, and infinity pools, in new york, hudson valley. Our focus on quality and aesthetics has made us one of the leading providers of high-end pools in the community, which is why we are the top choice for many of your neighbors. you can look us up at shelleyhillswimmingpools.com