<![CDATA[Lake Toba, the largest lake in Indonesia, faces water pollution problems due to many sources of household waste, fertilizer waste from rice fields, and fish feed waste. Therefore, a water quality monitoring system is needed to warn the public and visitors early before they carry out recreational activities or use water from the lake. This research aims to build a system that can monitor the water quality of Lake Toba in real-time using LoRa technology, as well as analyze the water quality of Lake Toba with the parameters pH, dissolved oxygen, temperature, and turbidity. As a result, we created a water quality monitoring system and obtained water quality analysis results from 3 locations that are always busy with tourists. The results of measurements at Pantai Pasir Putih received a temperature range of 25.5°C to 28.5°C, turbidity ranged from 4.1 to 5.5 NTU; pH levels varied between 6.8 to 7.2, dissolved oxygen levels ranged from 8 .0 mg/L to 9.0 mg/ L. The results of measurements at Siregar Aek Nalas recorded temperatures ranging from 25°C to 28°C, turbidity levels of approximately 11.49 NTU and 14.65 NTU, pH levels fluctuating between 9 and 11, dissolved oxygen levels ranging from 29 mg/L to 32 mg/L. The temperature obtained for Pantai Lumban Bulbul was 25°C, turbidity ranged from 0.62 NTU to 2.60 NTU, the pH level was also consistently measured at 8, and dissolved oxygen levels were recorded at 9-10 mg/L.]]>
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