Irrigation Systems are the lifeline for any agricultural operation. The Hawai`i Department of Agriculture, through its Agricultural Resource Management Division (ARMD) manages five irrigation systems, two on O`ahu (Kahuku and Waimanalo), two on the Island of Hawai`i (Waimea and Honoka`a-Paauilo), and one on Moloka`i (Ho`olehua).
The ARMD also manages the following reservoirs:
- Honokaia Reservoir located in Honokaia, Island of Hawai`i
- Paauilo Reservoir located in Paauilo, Island of Hawai`i
- Puu Pulehu Reservoir located in Waimea, Island of Hawai`i
- Waimea 60 MG Reservoir located in Waimea, Island of Hawai`i
- Kualapuu Reservoir located in Kualapuu, Island of Moloka`i
- Waimanalo 60 MG Reservoir located in Waimanalo, Island of O`ahu
All recreational activities, including swimming and fishing, in the above-listed reservoirs are prohibited. These reservoirs are not open to the public. Trespassers will be prosecuted in accordance with §708-814, Hawaii Revised Statutes.
Waimanalo Irrigation System
- length: 15 miles
- acres served: 1,174 acres
- transports: 150.0 million gallons per year
Kahuku Irrigation System
- length: 3 miles
- acres served: 445 acres
|Updated Aug. 1, 2022
Kahuku Irrigation System UPDATE – Rescinding of 10% Mandatory Water Conservation
Effective Monday, August 1, 2022, the mandatory 10% reduction in irrigation water use is hereby RESCINDED.
The emergency repair work to the irrigation pumps has been completed. Irrigation staff will monitor the system for continued operation and water delivery.
We ask our customers to be vigilant and continue to conserve our precious water resources as much as possible as head into the summer months.
If you have any questions, please contact our office at (808) 973-9473.
Waimea Irrigation System
- length: 15 miles
- acres served: 566 acres
- transports: 307.2 million gallons per year
Lower Hamakua Irrigation System (Honoka`a-Paauilo)
- length: 26 miles
- acres served: 4,755 acres
Moloka`i Irrigation System
- length: 25 miles
- acres served: 3,160 acres
- transports: 1.2 billion gallons per year
To Apply for Irrigation Services
To apply for irrigation water services, you may download the Application for Irrigation Water Service form (in pdf format on legal sized paper)
or obtained by writing or calling the Agricultural Resource Management Division below.
Changing an Acreage Assessment
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Hawai`i Department of Agriculture
Agricultural Resource Management Division
1428 South King Street
Honolulu, HI 96814-2512
Phone: (808) 973-9473
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