This research was conducted to see how access to clean water in the people of Surabaya and the impact of poor access to clean water on productivity. 70% of Surabaya's community water sources come from PDAM water, while the rest comes from ground water through wells, but in the poor only 54% use tap water. Poor access to clean water can cause illness, especially diarrhea. With the Two Way ANOVA analysis it was proven that there was a significant difference in the onset of diarrhea with clean water sources for bathing / washing and community groups based on income. Diarrhea causes loss of work time resulting in a decrease in productivity. The average lost workday is 3.7 days with a loss of productivity losses of Rp1,041,400 obtained by dividing Surabaya's GDP estimates in 2014 with the workforce. Based on the prevalence of diarrhea 1.2%, the total loss due to poor access to clean water for bathing / washing in Surabaya's GDP is known at Rp1,640,003,100,000.
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