It would be reasonable to expect that the best place to start a pool-cleaning business would be in a location where there are pools in every yard, but many of those areas are saturated with more pool-cleaning businesses than they need. Surprisingly, some of the best states to start a pool-cleaning business are in cooler climates. According to Zippia.com, the combination of salary and competition makes North Dakota, Hawaii, and Connecticut the most auspicious places for pool service technicians. Those states have some of the highest salary potential along with fewer pool-cleaning businesses to compete with, making it easier to stand out and find customers.