Follow these simple summer watering rules from May 1 to Oct. 1.
The watering rules incorporate best practices for efficient outdoor water use that will help keep your landscape healthy. It’s a simple way for you to help protect our water supply now and in the future.
- Water during cooler times of the day — lawn watering is NOT allowed between 10 a.m. and 6 p.m.
- Water two days per week, adding a third day only when needed. (Watering more than three days is not allowed.)
- Do not allow water to pool in gutters, streets and alleys.
- Do not waste water by letting it spray on concrete and asphalt.
- Repair leaking sprinkler systems within 10 days.
- Do not irrigate while it is raining or during high winds.
- Use a hose nozzle with a shut-off valve when washing your car.
Longer grass is more water efficient. Keep cool season grasses like Kentucky bluegrass between 2.5-3.5 inches and warm season grasses between 1-3 inches.
These times are based on a sprinkler system running at an efficient level. Watering is not allowed between 10 a.m. and 6 p.m.
The chart below is a starting point for the number of minutes to water each sprinkler zone on the days you determine watering is needed. These times are averages. Adjust your watering minutes based on rainfall, type of grass or plants, sunny or shady locations and other characteristics.
Watering two days a week should be sufficient during most of the summer. If needed, water a third day during extreme heat or dry periods. Water trees and shrubs as needed, but not between 10 a.m. and 6 p.m. Shrubs and perennials need half as much water as lawns.
There are no assigned watering days, but never water a zone more than three days per week.
| Watering Months |
Minutes to water per zone (For bluegrass, based on sprinkler type.) |
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|---|---|---|---|---|
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| January – April | Water trees and shrubs as needed. | |||
| May | 12 | 24 | 30 | 18 |
| June | 17 | 35 | 43 | 26 |
| July | 18 | 36 | 45 | 27 |
| August | 14 | 27 | 34 | 20 |
| September | 11 | 23 | 28 | 17 |
| October – December | Water trees and shrubs as needed. | |||
These times are based on a sprinkler system running at an efficient level. Watering is not allowed between 10 a.m. and 6 p.m.
Tip: Water, rest, water
To maximize efficiency and allow the soil time to soak up the water, add multiple start times and reduce each zone’s watering time. For example, a 14-minute run time may be irrigated for 7 minutes, turned off while another zone is irrigated, then irrigated for the remaining 7 minutes to achieve the total 14-minute run time.
*Rotary/high-efficiency nozzle information.
Get more information and tips for watering your lawn.
Did you know that most sprinkler clocks in Denver are set to run Monday, Wednesday and Friday at 5 a.m.? It’s also about the time many people begin to wake up, take showers and start their morning routines.
Denver Water system operators see water use peak at these times throughout the summer.
The thing is, accommodating these peak water use times carries a cost. We have to build bigger facilities and incur higher energy costs to meet these peak demands. (And you might notice the water pressure is slightly less during these times, too.)
Set your sprinkler control clocks to run Tuesday and Thursday mornings, before 3 a.m. Watering two days a week should be sufficient during most of the summer. If needed, add a third water day (such as Sunday before 3 a.m.) only during periods that are extremely hot and dry.
Denver Water customers with newly planted seed or sod may water the new turf as necessary for up to 21 days. After 21 days, the seed or sod is subject to outdoor watering rules.
If you are requesting a watering exemption, the newly landscaped area should be 250 square feet or larger. It is wasteful to run an irrigation system on an area any smaller, and you can hand water areas that are less than 250 square feet. Keep in mind that you may see an increase in your water use upon watering for up to 21 days.
Tip: Amending the soil with compost prior to planting will help to establish new plant material more successfully. Denver Water recommends that you till compost into the areas that you are planting. Learn more about the benefits of compost.
To submit your request for a 21-day watering rules exemption, fill out the Customer Care Contact Form (available 24/7), chat with us during business hours using the blue chat icon located in the lower right-hand corner of this page, or call 303-893-2444.
Report water waste
- If you see water waste in Denver parks, water use that does not meet the rules, call 3-1-1.
- To report water waste anywhere else, do one of the following:
- Fill out our Report Water Waste form online (available 24/7).
- Chat with us during business hours using the blue chat icon located in the lower right-hand corner of this page.
- Call Denver Water at 303-893-2444.