Irrigation

When will irrigation water be available?

The City of Nampa irrigation customers can expect full pressure for this service by the end of April. Crews will first need to test the lines, flush the system and bring ditch pumps online. Crews will work to ensure the water lines are functioning properly and may need to temporarily shut down a line for repair. Temporary closures while crews work to bring lines to full operation may interrupt service for customers, and patience is appreciated. 

Irrigation water supplied through our irrigation system is a necessary and critical resource to farmers, homeowners and businesses in our community. The City of Nampa receives the majority of its irrigation water from canals and ditches supplied from mountain reservoirs like Arrow Rock, Lucky Peak, and Anderson Ranch. Pumps draw water from the canals and ditches to provide pressurized service to customers. 

While subject to change, Nampa-Meridian Irrigation District plans to release water into the canals no sooner than April 22, Pioneer Irrigation District on April 16, and Boise-Kuna Irrigation District on April 22. 

How long will the irrigation water be available?

The length of the irrigation season is dependent on water in the reservoirs and canals. The City of Nampa is also encouraging all water users to be mindful of this natural resource and water wisely. See watering tips from experts below.

Reminders for Nampa's Irrigation Customers:

  • Nampa residents are asked to check the programming of their sprinkler control box to ensure they are not over-watering. 
  • If customers notice a leak, they are encouraged to call the 24-hour hotline at 208-468-5860. Please know that due to the volume of calls, it may be necessary to leave a voice message. Staff will return calls as soon as possible. 
  • Customers requiring assistance setting a sprinkler control box are encouraged to contact a local landscaping professional. 
  • Residents are also strongly encouraged to install their own shut-off valve to control sprinkler lines and are asked not to operate the city valve, as this is for emergency use only.  

How can I prepare for the expected drought?

Experts forecast another drought year and currently our area is considered to be in a severe drought. To best prepare our community, the City of Nampa has formed a Drought Task Force and is working with a variety of organizations. 

We also held a community open house on April 7 from 6-8pm at the Nampa Civic Center. Representatives from Nampa's three irrigation districts were present and Jos Zamzow provided a free one-hour class on the best way to build your lawn's drought muscle. The University of Idaho Canyon County and the Idaho Rural Waters Association were also sharing valuable resources and information. The event was attended by over 300 people.

Open House Boards

City of Nampa's #2CWaterWise Brochure

Jos Zamzow presentation handout

2022 Irrigation Season

To keep up with maintenance costs related to our pressurized irrigation system, a rate increase of 13.7% is needed and was approved by the Board of appraisers and Nampa City Council. Property Owners will see an average increase of $17.54 on their annual irrigation bill this year. The total cost to water your lawn with pressurized irrigation in Nampa is still less than $1 per day (on average).  

To learn more, please click here to view the mailer sent to customers.

A reminder to the City of Nampa water users: Please do not use potable (house) water to irrigate your lawn as it will increase the water and sewer charges to your utility bill.

Irrigation Districts

The majority of Nampa’s irrigation water comes in the canal system from Lucky Peak. The Pioneer Irrigation District and the Nampa Meridian Irrigation District manage most of the canals and ditches in Nampa. In some cases, these irrigation districts are solely responsible for the infrastructure leading to a customer’s property.

City of Nampa Pressurized Irrigation

In many subdivisions, the City of Nampa Waterworks Division is responsible for the pressurized irrigation pump stations, water main lines, and curb stop valves.

The service line, which is between the curb stop and the sprinkler head, belongs to the property owner. The City will not repair a customer’s service line.

Over Watering

Water is a valuable resource in our community, for this reason over watering violates City Code.

Nampa City Codes Section 8-1-22 Waste of Irrigation Water

To report over-watering send us an email.

Watering Tips

Could you be overwatering? Read here

Also, Read our Do-it-Yourself Water Check for the Home Landscape

Policy & Property Assessment Login

Read our Broken Curb Stop Policy

This policy is to address the issue of broken curb stops caused by anyone other than authorized City of Nampa employees. 


AFTER HOUR EMERGENCIES ONLY: There is someone on call after normal business hours, 365 days per year (208) 468-5860.

Please Note: An emergency is any event that causes or threatens to cause damage to property, life or health. We understand your irrigation water is important to you. Please call the number above during normal business hours 8am-5pm Monday-Friday if you are experiencing water outages or low pressure and we will respond to you in a timely manner.