DATA & STATISTICS
2026 Groundwater Status Reports
See the monthly groundwater status reports from the Board of Water Supply for January through December 2026.
April 2026 Groundwater Levels Status Report
One aquifer index station was in low groundwater condition for the production month of April 2026. Kaimukī is in Caution Status. The monthly production average for April 2026 was 122.89 million gallons per day.
The Board of Water Supply rainfall index for the month o f April 2026 was 91 percent of normal, with a 5-month moving average of 180 percent. As of May 5 , 2026, the Hawai'i Drought Monitor shows no drought conditions across the entire island of O'ahu. The National Weather Service is forecasting above-normal precipitation through May 2026.
All monitoring wells exhibited increasing head levels for the month of April 2026. This reflects the relatively higher rainfall over the past several months, combined with associated decreased production. Average monthly production for April 2026 is lower than April 2025 and lower than the 5-year monthly average.
March 2026 Groundwater Levels Status Report
Four aquifer index stations were in low groundwater condition for the production month of March 2026. Pearl City, Punalu'u and Waialua are in Caution Status. Kaimukī is in Alert Status. The monthly production average for March 2026 was 120.05 million gallons per day.
The Board of Water Supply rainfall index for the month of March 2026 was 319 percent of normal, with a 5-month moving average of 181 percent. As of April 7, 2026, the Hawai'i Drought Monitor shows no drought conditions across the entire island of O'ahu. The National Weather Service is forecasting above-normal precipitation through May 2026.
Most monitoring wells exhibited increasing head levels for the month of March 2026. This reflects the relatively higher rainfall over the past month, combined with seasonal decreased production. Average monthly production for March 2026 is lower than March 2025 and lower than the 5-year monthly average.
February 2026 Groundwater Levels Status Report
Seven aquifer index stations were in low groundwater condition for the production month of February 2026. Moanalua, Pearl City, Waipahu, Kaluanui, and Waialua are in Caution Status. Kaimukī and Punaluʻu are in Alert Status. The monthly production average for February 2026 was 122.44 million gallons per day.
The Board of Water Supply rainfall index for the month of February 2026 was 270 percent of normal, with a 5-month moving average of 127 percent. As of March 3, 2026, the Hawai'i Drought Monitor shows no drought conditions across the entire island of Oʻahu. The National Weather Service is forecasting above-normal precipitation through May 2026.
Most monitoring wells exhibited increasing head levels for the month of February 2026. This likely reflects the relatively higher rainfall over the past month, combined with seasonal decreased production. Consumer water conservation measures, as encouraged by recent BWS community awareness messaging, may have also played a role. Average monthly production for February 2026 is lower than February 2025 and the 5-year monthly average.
January 2026 Groundwater Levels Status Report
Eight aquifer index stations were in low groundwater condition for the production month of January 2026. Beretania, Moanalua, Pearl City, Waipahu, Kaluanui, and Waialua are in Caution Status. Kaimukī and Punaluʻu are in Alert Status. The monthly production average for January 2026 was 123.99 million gallons per day.
The Board of Water Supply (BWS) rainfall index for the month of January 2026 was 90 percent of normal, with a 5-month moving average of 81 percent. As of February 3, 2026, the Hawaiʻi Drought Monitor shows no drought conditions across most of Oʻahu, grading to abnormally dry conditions along narrow portions of the northern, windward, and southern coasts, then to moderate drought conditions along the southeastern coast. The National Weather Service is forecasting above-normal precipitation through May 2026.
Most monitoring wells exhibited increasing head levels for the month of January 2026. This likely reflects the relatively higher rainfall over the past month, combined with seasonal decreased production. Consumer water conservation measures, as encouraged by recent BWS community awareness messaging, may also play a role. Average monthly production for January 2026 is lower than January 2025 and the 5-year monthly average.
Updated: 03/19/2026