A well-chosen sprinkler or irrigation setup can keep a yard healthy without wasting water, but even the most common hose-end sprinkler types only work efficiently when they are set up and maintained correctly. According to the EPA’s WaterSense program, residential outdoor water use accounts for nearly 8 billion gallons of water each day across the United States, and as much as 50 percent of that can be wasted due to evaporation, wind, or runoff caused by inefficient irrigation methods and systems.
Why Sprinkler Efficiency Matters
The EPA’s WaterSense labeled outdoor products facts note that a single broken or missing sprinkler head can waste as much as 25,000 gallons of water and hundreds of dollars over a six-month irrigation season. Homes with automatically timed irrigation systems often use significantly more water outdoors than those without them, largely because of improper scheduling and unnoticed inefficiencies. Small problems add up quickly, so regular checks and smart watering habits make a measurable difference.
WaterSense also points out that high water pressure can cause sprinklers to spray faster than expected, leading to misting, fogging, and uneven coverage. When water lands on sidewalks, driveways, or the street, it does nothing for your plants and contributes to runoff that can carry fertilizers and pesticides into local waterways. Keeping water on the landscape is one of the simplest ways to reduce waste.
How to Measure Your Sprinkler’s Output with a Catch-Can Method
Both the EPA and the University of Florida IFAS Extension recommend a straightforward catch-can method to find out how much water your sprinkler is actually putting down and how evenly it covers the area. The EPA’s WaterSense watering tips suggest placing a few empty tuna cans around the lawn while you water, then measuring how long it takes the sprinkler to fill them with a half inch of water. Once you know that time, you can try watering that amount twice a week, observe how your landscape responds, and adjust based on weather conditions.
The UF/IFAS catch-can guide provides a slightly different approach that works for both in-ground systems and hose-end sprinklers. Use at least 10 straight-sided containers of equal size, such as cat-food or tuna cans. For an in-ground system, run one zone at a time and place the cans randomly throughout that zone. For a hose-end sprinkler, place the cans in a straight line away from the sprinkler. Run the system or sprinkler for 15 minutes per zone, then use a ruler to measure the depth of water in each container. Calculate the average depth across all cans in that zone. The guide states that you should not exceed ½ to ¾ inch of water per watering, and that the exact amount your yard needs depends on soil type: clay or organic-rich soils that hold more water may need less than the maximum.
If you notice some cans are dry while others are overflowing, the UF/IFAS guide recommends inspecting your system more closely to find the cause, and if necessary, calling a certified irrigation professional. Both sources emphasize watering in the early morning. The UF/IFAS guide specifically says the best time is between 4 and 6 a.m. to avoid creating conditions conducive to disease and to reduce evaporation. The EPA’s watering tips similarly advise against watering in the middle of the day when the hot sun evaporates much of the water before it reaches plants.
When Drip Irrigation Is the Better Choice
For garden beds, shrubs, and areas with irregularly spaced plants, drip irrigation often makes more sense than overhead sprinklers. Clemson Extension’s guide on installing drip irrigation in home gardens explains that drip systems apply water directly to the root zone, maintaining consistent soil moisture, minimizing evaporation and runoff, and promoting deeper root growth. This targeted approach also discourages weed growth and significantly lowers the risk of fungal diseases by keeping leaves dry.
The EPA’s WaterSense labeled outdoor products facts state that microirrigation, which includes drip irrigation, uses 20 to 50 percent less water than conventional spray sprinkler systems. It delivers water slowly and over a longer period, preventing runoff and reducing evaporation. Clemson Extension notes that drip emitters can be inserted at the base of each plant, precisely where water is needed, making the system especially efficient for smaller areas or plants spaced farther apart. If you are watering a vegetable garden, flower bed, or mixed border, a drip irrigation kit is worth considering before you rely solely on a hose-end sprinkler.
Simple Checks to Keep Your Irrigation System Efficient
Regular inspections catch small problems before they waste thousands of gallons. The table below pulls together checks recommended by the EPA and UF/IFAS, along with the reasons they matter and how to perform them.
| What to Check | Why It Matters | How to Do It |
|---|---|---|
| Leaks, broken or clogged heads | The EPA says one broken head can waste 25,000 gallons over six months; leaks and clogs cause uneven watering. | Inspect your system monthly, as the EPA recommends. Look for broken or clogged heads and correct obstructions. |
| Sprinkler alignment | The EPA notes that lots of water is wasted by sprinklers that spray sidewalks, driveways, and the street. | Adjust heads so water stays on the landscape and off pavement. The UF/IFAS guide also says do not irrigate impervious surfaces. |
| Water pressure | High pressure can cause excessive flow rates, misting, fogging, and uneven coverage, according to the EPA. | Use WaterSense labeled spray sprinkler bodies with integral pressure regulation to control pressure and improve distribution. |
| Even coverage | UF/IFAS states that uneven coverage can leave one area too dry and another overwatered. | Perform a catch-can method in each zone. If some cans are dry or overflowing, inspect and adjust the system. |
| Controller schedule | The EPA says irrigation schedules should be adjusted based on seasonal changes to avoid overwatering. | Use a WaterSense labeled irrigation controller that adjusts based on weather or soil moisture, or manually update your clock timer. A hose timer can help with hose-end setups. |
Pairing these checks with the right garden hose and a hose nozzle that gives you good flow control makes it easier to water efficiently without wrestling with your equipment.
Frequently asked questions
How often should I water my lawn?
The EPA’s WaterSense watering tips say your landscape will typically require one inch of water a week, including rainfall, but that can vary depending on where you live, recent weather, and the plants in your landscape. The UF/IFAS catch-can guide recommends watering in the early morning (4 to 6 a.m.) to reduce evaporation and disease pressure, and using a catch-can method to determine how long to run your system to apply the right amount. The EPA suggests your area’s Cooperative Extension Service or local water utility for advice tailored to where you live.
What is the difference between drip irrigation and sprinklers?
According to the EPA, microirrigation (including drip) delivers water slowly and directly to the root zone, using 20 to 50 percent less water than conventional spray sprinklers. Clemson Extension adds that drip irrigation minimizes evaporation and runoff, keeps leaves dry to reduce fungal diseases, and is ideal for garden beds and irregularly spaced plants. Whatever you use on lawns, keep sprinklers adjusted so water stays off pavement.
How can I tell if my sprinkler system is wasting water?
The EPA recommends looking for signs like water pooling, runoff, misting, or spray hitting pavement. A monthly inspection for leaks, broken heads, and clogged nozzles can catch problems early. The UF/IFAS catch-can method can reveal uneven coverage, and if you notice dry or flooded spots, you may need to adjust heads or call a certified irrigation professional.
For more on hoses, nozzles, timers, and drip kits, browse our Watering category.
