What is the one inch of water per week guideline?

Many sources, including the University of Minnesota Extension, indicate that one inch of water per week, including rainfall, is all your lawn needs to be healthy. 

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1. Why was the lawn & landscape policy changed?
2. When did the update two days per week policy go into effect?
3. How do I know which days to water/which watering zone I am in?
4. I have a private well; do I still need to follow the Lawn Watering Policy?
5. When can homeowner associations irrigate?
6. When can commercial, industrial, institutional properties (schools/churches) irrigate?
7. What if I am planting new seed/sod?
8. I’m worried about my grass dying. How can I protect it?
9. What happens if the lawn watering policy is violated?
10. What about other outdoor water uses?
11. How do I reprogram my irrigation controller?
12. Why is there a five-day gap between allowed watering days for Zone "A"?
13. How were the irrigation zones determined?
14. What is the one inch of water per week guideline?
15. The 2021 elevated watering restrictions were enforced during extreme drought conditions. Why do we need these policy changes in a non-drought year?