Calculate Annual Lawn Watering Cost
Select your state for a pre-filled water rate, then enter your sprinkler flow and schedule. Edit the rate to match your actual utility bill.
- Water in the early morning (5–9am) — less evaporation
- Install a rain sensor to skip watering after rainfall
- Smart controllers can reduce water use by 15–25%
- Adjust schedule seasonally — cool/rainy weeks need less
© 2025 GardenMath. Water rates are averages and may differ from your utility bill. Always check your bill for accurate pricing. This page does not store personal data.
How Much Does Lawn Irrigation Cost?
The national average cost to water a lawn is about $0.002–0.005 per gallon, but this varies dramatically by state. Arizona and California typically have higher water rates due to scarcity, while states in the Pacific Northwest often pay less. A typical lawn sprinkler running at 10 gallons per minute for 20 minutes uses 200 gallons per session — at $0.003/gallon that's $0.60 per session, or about $94 per year for 3 sessions per week.
How to Read Your Water Bill
Most utilities charge in units of CCF (hundred cubic feet) or HCF, or in thousands of gallons. To convert: 1 CCF = 748 gallons. Divide your dollar charge by the gallons used to get your cost per gallon, which you can enter into this calculator for exact results.