Why water savings vary
Water savings come from stopping routine irrigation. The exact number depends on how much you currently water natural grass, your climate, and irrigation efficiency.
- Climate and evapotranspiration: Hot, dry regions require more inches of water per year.
- Irrigation habits: Fixed schedules and overspray push water use higher than plant need.
- Soil and slope: Runoff and poor infiltration waste water.
- Landscape use: Pet areas may need occasional rinsing that slightly reduces net savings.
The 0.623 method: calculate your site
Use this constant to translate inches of irrigation into gallons: 0.623 gallons per square foot per inch of water.
Step 1: Estimate annual irrigation depth (inches)
- Use local ET or watering guidelines from your water agency or extension office.
- Quick rule of thumb for cool season lawns: about 1 inch per week during the active season. If your season is 24 to 40 weeks, that is roughly 24 to 40 inches per year.
Step 2: Convert inches to gallons
Gallons per year = Area (sq ft) × 0.623 × Inches per year.
- For 1,000 sq ft: Gallons per year = 1,000 × 0.623 × Inches = 623 × Inches.
Step 3: Subtract any rinse water
If you rinse occasionally, subtract that from the total savings. Many installs need little to no rinse water.
Example scenarios for 1,000 sq ft
- Temperate, efficient watering at 24 inches per year: 24 × 623 = about 15,000 gallons saved.
- Warm, moderately arid at 40 inches per year: 40 × 623 = about 25,000 gallons saved.
- Hot, arid at 60 inches per year: 60 × 623 = about 37,000 gallons saved.
These examples sit inside the common 15,000 to 40,000 gallon range. Overwatering can push savings higher, but model your property instead of relying on averages.
Maintenance water after conversion
- Routine use: Most artificial turf needs no irrigation. Dust can be managed with a blower or brush.
- Pet areas: A light hose-down might use 10 to 50 gallons per 1,000 sq ft per rinse. Weekly rinsing adds roughly 500 to 2,600 gallons per year.
- Heat mitigation: Occasional cooling sprays are optional and typically minimal for landscape use.
Net savings still remain strong even with occasional rinsing because irrigation loads are far higher than any maintenance water.
Regional quick notes
- Southwest and Mountain West: High ET and long dry seasons drive savings toward the high end.
- Southern and Southeast: Warm seasons and humidity vary, but long growing seasons still produce substantial savings.
- Coastal and Pacific Northwest: Shorter dry seasons mean lower inches applied and savings toward the lower end.
From gallons to dollars
To estimate bill savings, multiply gallons saved by your water and sewer rates.
- Find $ per 1,000 gallons on your utility bill.
- Annual savings ($) = Gallons saved ÷ 1,000 × Rate per 1,000 gallons.
- Include sewer charges if they scale with water use in your area.
Model your property now
- Pick a realistic annual irrigation depth (inches) using local guidance.
- Compute gallons: Inches × 623 for each 1,000 sq ft of turf you plan to replace.
- Subtract any planned rinse water to get net savings.
- Optionally convert to dollars using your utility rates.
Want a precise, site specific projection and turf spec guidance that fits your use case? Talk with FusionTurf. We will help you model inches, gallons, and payback with straight answers.
