American Water Works Company, Inc. (AWK)

American Water Works is the largest private water and wastewater utility in the United States.

Its business is simple: it owns the treatment plants and the pipes that bring water to your house and take wastewater away.

Because it’s a utility, the government gives it exclusive rights to serve certain areas, and in exchange, the government decides how much the company is allowed to charge.

The vast majority of money comes from regulated water services.

American Water Works is a regulated utility.

That means if you want water in one of their service areas, you have to buy it from American Water Works. There is no competitor.

Their moat comes down to three things:

1. Exclusive Territories. The government legally prevents anyone else from laying pipes in AWK’s service areas.

2. Scale. American Water is the only player with the size to buy 23 systems in a single year (as they did in 2025) and manage them efficiently across 14 states.

3. Investment Flywheel. The government actually encourages the company to spend money. The more AWK spends on fixing old, leaky pipes, the more profit they are legally allowed to earn. This makes their growth very predictable compared to a normal company.