Last updated September 30, 2025

IID provides raw (untreated) Colorado River water to municipal, industrial and commercial customers. For a complete description of IID’s Water Rules and Regulations, please refer to Regulation No. 3 Application for Service.

Industrial water users may be required to sign a contract, which specifically limits the amount of water discharged into IID drains, and maintain a water metering device. The contract may also specify the water holding facilities required for the industry.

New Water Supply Agreements
In September 2009 the IID Board of Directors adopted an Interim Water Supply Policy for Non-Agricultural Projects (IWSP) to provide a mechanism to address new water supply requests for proposed projects being developed within the IID service area. The IWSP designates up to 25,000 acre-feet of IID’s annual Colorado River water supply for any new projects, provides a mechanism and process to develop a water supply agreement for any appropriately permitted project, and establishes the framework and set of fees necessary to ensure the supplies used to meet any new demands do not adversely affect existing users by funding water conservation or augmentation projects.

Depending on the nature, complexity and water demands of the proposed project, new projects may be charged a one-time Reservation Fee and an annual Water Supply Development Fee (see chart) for the contracted water volume used solely to assist in funding new water supply projects. All new industrial use projects shall be subject to the fee, while new municipal and mixed-use projects shall be subject to the fee if the projects’ water demands exceed certain District-wide average per capita use standards. The applicability of the fee to mixed-use projects will be determined by IID on a case-by-case basis, depending on the proportion of types of land uses and the water demand proposed for each project. Additionally, new projects will be charged the appropriate water rate (see Water Rate Schedules) based on actual water use.

Interim Water Supply Policy 2025 Annual Non-Agricultural Water Supply Development Fee
Annual Demand (AF)	Reservation Fee ($/AF)*	Development Fee ($/AF)*
0-500	$91.39	$365.54
501-1000	$128.67	$514.68
1001-2500	$161.57	$646.28
2501-5000	$199.59	$798.34

*To be adjusted annually after 2010 in accordance with the Consumer Price Index (CPI).

To date, IID has issued two Water Supply Agreements and one conditional “Will-Serve” letter under the IWSP totaling 6,380 acre-feet per year, leaving a balance of 18,620 acre-feet per year of supply available for contracting under the IWSP.

For new, non-agricultural water supply, please read available information posted below. New project contacts in need of more detailed information from IID regarding the IWSP or water supply availability can be directed to Justina Gamboa-Arce at (760) 339-9085.

For temporary projects, including construction activities, please complete the Application for Temporary Water Use and submit it with an Encroachment Permit Application to the Real Estate Section. 

DOWNLOAD
Temporary Land Conversion Fallowing Policy [PDF] Adopted 5/8/2012 (Revised 3/29/2016)
IID Interim Water Supply Policy (IWSP adopted 9-29-09 with 2025 revised fee schedule) [PDF]
IID Water Supply Assessment/Water Supply Verification Consultation Process [PDF]
IID-410 Certificate of Ownership and Authorization May 2011 [PDF]
Resolution 31-2009 adopting IWSP and CEQA Negative Declaration [PDF]