Odd thing to put on a gratitude list, and it's one of the largest items on it. Clean water and sewage systems have saved more lives than every heroic surgery combined, and no one has ever felt a rush of emotion about a pipe.
That's the pattern with infrastructure. It's designed to go unnoticed, and its success is measured entirely in absence. Nobody in your household will get cholera this year.
Someone maintains that. Continuously, invisibly, on a salary you'd probably consider low.
Drink a glass of tap water today and know exactly what it is you're doing.