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Drinking Water Supply

The City of Boulder is fortunate to have several high-quality sources of water both east and west of the Continental Divide, including the headwaters of Boulder Creek and diversions from the upper Colorado River on the west slope.

The city's ability to obtain water from both east and west slope sources (watersheds) provides a measure of water service reliability in response to moderate, localized droughts or other events.



Water Conservation and Drought Planning

Hot and dry conditions make it increasingly important to conserve water! Visit the city’s  Water Conservation webpage , which provides a variety of services to help customers manage water use in and around the City of Boulder.

The city’s Drought Plan ( Volume 1 and Volume 2 ) provides guidance for recognizing droughts that will affect water supply availability and for responding appropriately to these droughts. Learn about drought conditions and responses to frequently asked drought-related questions on the city’s Drought Watch webpage .

Water Leasing

One of the ways the City of Boulder manages the year-to-year variation in water supply is through its agricultural water leasing program. In average or above average supply years, the leasing program allows the city to make surplus water supply available to other users.

Utilities’ Water Resources work group manages the city’s annual water leasing program, which primarily serves agricultural lessees for single year leases of Colorado-Big Thompson (CBT) water. Each year, on Jan. 1, city staff begins accepting lease requests from prospective lessees. In June or July, depending on whether the city’s Boulder Creek reservoirs are full, annual water leases are offered to lessees based on the order the lease requests were received and with priority given to water users in Water District 6 (Boulder Creek basin). Once lease agreement documents are signed and payment is made to the city, arrangements are made to deliver water to the lessees. Lease rates are set annually and can be found in Boulder Revised Code Section 4-20-25(d) .

One unique type of lease involves augmentation water, which requires fully consumable water rights and typically requires a long-term commitment to meet the lessee’s needs. Due to water rights limitations and administrative burden, the city is currently unable to offer augmentation leases as part of the leasing program.

To learn more about water leases or to request an annual CBT lease, please contact:

Doug Dunn
Water Resources Specialist 
[email protected]

Irrigation Ditches

The city creates irrigation ditches, or channels that deliver water from natural sources to homes, farms, businesses, industries and other uses. For further information about ditch companies, ditch maintenance, and information for homeowners and developers, please visit the city’s Irrigation Ditch Frequently Asked Questions .

For questions or issues regarding irrigation ditches, please contact: 

Douglas Dunn
Water Resource Specialist
[email protected]  

Helpful Links:

Water Rights


To ensure that there will be an adequate supply of raw, untreated water available for future growth, the Utilities Division purchases water rights at market value, as they become available, from private individuals who own shares in local ditch companies.

Ditch Operations

The Utilities Division maintains a water portfolio that includes shares in numerous local irrigation ditch companies. As a shareholder, the city becomes a part owner of the ditch company. 

City staff maintains close contact with the farming community through the ditch companies. The city can assist in ensuring adequate irrigation water supplies to select farming interests through its water leasing program.


Using city and contract legal services, the Utilities Division monitors all local water rights legal cases to ensure that the proposed changes have no detrimental impact to the city's water utility operations or to local ditch company interests.

Legal issues arising from city transfers are also litigated, with emphasis given to ensure that ditch company operations are not impacted by the transfers.

Past & Present

Water for Boulder’s Future

Within the projected build-out scenario, the City of Boulder will have sufficient water supplies to meet the city’s projected water needs to the level of reliability set by City Council. Several factors have contributed to this situation.

  1. In 1989, City Council established standards for the city to assure a reliable water supply.
  1. Prior to projected city growth, Boulder’s water facilities will have better delivery and storage capacities. Boulder has seen about 90% of its potential growth. Therefore, new homes and developments will have a limited additional impact on our water supply.
  1. It has been determined that the city will have sufficient water supplies to meet Boulder’s future needs within projected city growth for the city water service area, as defined in the Boulder Valley Comprehensive Plan.