Latar belakang: Diare masih menjadi permasalahan Kesehatan secara global maupun nasional. Di Indonesia, Jawa Barat memiliki persentase kejadian diare pada balita sebesar 11%. Angka ini tertinggi ke-5 secara nasional dan paling tinggi di pulau Jawa. Berbagai intervensi sudah dilakukan guna mengurangi angka diare pada balita. Namun, masih tingginya kejadian diare pada balita di Jawa Barat membuat penelitian ini diperlukan untuk mengidentifikasi determinan kejadian diare pada balita di Jawa Barat. Metode: Penelitian ini menggunakan data SKI 2023 dengan total sampel sebanyak 913 balita. Desain studi yang digunakan yaitu cross-sectional. Data dianalisis berdasarkan complex sample secara univariat, bivariat dengan uji chi-square, dan multivariat dengan uji regresi logistic berganda. Hasil: Faktor yang berhubungan signifikan dengan kejadian diare pada balita di Jawa Barat adalah drainase limbah (p-value 0,004; OR 2,188; CI 1,283-3,733) dan fasilitas cuci tangan (p-value 0,044; OR 1,808; CI 1,017-3,213), sedangkan untuk sumber air minum dan pengolahan air minum menjadi variabel confounding. Kesimpulan: Upaya optimalisasi sanitasi di masyarakat masih perlu ditingkatkan, di samping itu upaya pencegahan masih perlu dimasifkan untuk meningkatkan keberhasilan penurunan prevalensi kejadian diare pada balita di Jawa Barat.

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Background: Diarrhea remains a significant health problem globally and nationally. In Indonesia, West Java has a diarrhea prevalence of 11% among under-five children. This figure is the 5th highest nationally and the highest on Java Island. Various interventions have been implemented to reduce diarrhea rates in under-five children. However, the persistently high incidence of diarrhea in under-five children in West Java necessitates this research to identify the determinants of diarrhea incidence in under-five children in West Java. Methods: This study utilized SKI 2023 data with a total sample of 913 under-five children. A cross-sectional study design was employed. Data were analyzed using complex sample analysis, including univariate, bivariate with chi-square test, and multivariate with multiple logistic regression. Results: Factors significantly associated with diarrhea incidence in under-five children in West Java were wastewater drainage (p-value 0.004; OR 2.188; CI 1.283-3.733) and handwashing facilities (p-value 0.044; OR 1.808; CI 1.017-3.213), while drinking water source and drinking water treatment were identified as confounding variables. Conclusion: Efforts to optimize community sanitation still need to be improved. Furthermore, prevention efforts need to be intensified to enhance the successful reduction of diarrhea prevalence in under-five children in West Java.