is Hawaii's second-largest reservoir (). It irrigates agricultural fields, including the Dole Pineapple Plantation fields at the northern part of Wahiawa, all the way to Oahu's North Shore, where it empties. Demographics As of the census of 2000, there were 16,151 people, 5,376 households, and 3,956 families residing in the CDP. The population density was . There were 5,900 housing units at an average density of . The racial makeup of the CDP was 11.31% White, 2.02% Black or African American, 0.32% Native American, 45.77% Asian, 9.62% Pacific Islander, 1.83% from other races, and 29.14% from two or more races. 11.00% of the population were Hispanic or Latino of any race. There were 5,376 households, of which 31.3% had children under the age of 18 living with them, 49.2% were married couples living together, 18.0% had a female householder with no husband present, and 26.4% were non-families. 21.9% of all households were made up of individuals, and 10.5% had someone living alone who was 65 years of age or older. The average household size was 2.97 and the average family size was 3.45. In the CDP the population was spread out, with 26.1% under the age of 18, 8.6% from 18 to 24, 26.6% from 25 to 44, 19.9% from 45 to 64, and 18.8% who were 65 years of age or older. The median age was 38. For every 100 females there were 94.6 males. For every 100 females 18 and over, there were 91.4 males. The median income for a household in the CDP was $41,257, and the median income for a family was $46,524. Males had a median income of $32,018 versus $25,287 for females. The per capita income for the CDP was $16,366. 16.7% of the population and 13.5% of families were below the poverty line. Of the total population, 23.8% of those under 18 and 9.9% of those 65 and older were living below the poverty line. Government and infrastructure The Honolulu Police Department operates the Wahiawa Substation in Wahiawā. A satellite gateway for the Iridium satellite phone network is operated by the DISA in Wahiawa. In the Hawaii State Legislature, Wahiawā is part of Hawaii State House of Representatives district 39 (currently represented by Lei Learmont) and Hawaii State Senate district 22 (currently represented by Donovan Dela Cruz.) In the Honolulu City Council, Wahiawā is part of district 2 (currently represented by Ernest Y.