Smart Irrigation Savings: Indoor vs Outdoor Water Use
Daily Use Overview
Water is used extensively both inside our homes and for outdoor needs like lawn irrigation. The U.S. Environmental Protection Agency (EPA) estimates an average household of four people uses more than 300 gallons per day, with roughly 70% used indoors and 30% outdoors. In per-capita terms, this works out to about 60–100 gallons per person per day. Focusing on indoor use alone, recent studies find an average of ~60 gallons per person per day used inside the home—roughly 240 gallons per day for a family of four. This section details how that indoor water is typically used and compares it to the water consumed by a traditional lawn sprinkler irrigation system.
Average Indoor Water Use per Person and Household
On average, a single person uses 50–70 gallons of water daily indoors. For a four-person household, this totals 200–280 gallons per day. Bathrooms and laundry account for the majority of this use. Toilets alone represent about 27% of total indoor usage. The EPA and Water Research Foundation provide the following breakdown.
Breakdown of Indoor Water Use by Category
- Toilets: 24–27% of indoor water use (~30–40 gallons/day).
- Showers: ~20% (~45–50 gallons/day for a family of four).
- Faucets: ~19–20% (~45–50 gallons/day).
- Clothes Washing: ~16–17% (~35–45 gallons/day).
- Leaks: ~12–13% (20–30+ gallons/day lost).
- Other Uses: ~8% (baths, dishwashing, miscellaneous).
Water Use of a Traditional Sprinkler Irrigation System
A typical sprinkler system with 6 zones running 20 minutes each, twice per week, uses approximately 3,840 gallons per week—or about 548 gallons per day averaged out. That’s 15,000+ gallons per month—often double the home’s indoor water use.
Daily Average: Sprinkler vs. Indoor Water Use
- Indoor use: ~250–280 gallons/day
- Outdoor irrigation: ~500–550 gallons/day
What This Means for You
Traditional lawn irrigation can easily surpass all indoor water usage combined. Homeowners looking to reduce their water bill or environmental impact should start with outdoor water use. Smart irrigation technology, scheduling adjustments, and landscaping changes can make a big difference.
- MP Rotators: Save up to 30% compared to traditional spray heads by delivering water more slowly and uniformly, improving soil absorption and reducing runoff. They apply water at approximately 0.4 inches per hour, the same precipitation rate as many rotors. However, unlike rotors—which deliver intermittent, single-stream water to each area—MP Rotators continuously distribute water across the zone, providing consistent coverage and reducing the risk of dry spots or uneven watering.
- Toro Precision Nozzles: Save up to 35% thanks to patented H²0 chip technology that creates precise streams and consistent coverage, delivering a matched precipitation rate of approximately 1 inch per hour, often reducing flow rates by up to 1 GPM per nozzle.
- Pressure Regulated Sprinklers: Save up to 10% by maintaining consistent water pressure at the sprinkler head, preventing misting and evaporation losses—especially when paired with high-efficiency nozzles.
- Smart Controllers: Save up to 20% by automatically adjusting run times based on weather, soil, and seasonal conditions, ensuring efficient watering without overwatering.
When combined—using a smart controller, pressure-regulated sprinklers, and high-efficiency nozzles—homeowners can save up to a whopping 60% on outdoor water use.
Estimate Your Savings
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Looking to cut your water bill? Explore smart irrigation options that save money and protect your landscape.