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Geo-Inquiry-based Community Service Learning is a learning model designed to increase higher-order thinking skills through a scientific process by carrying out community service activities. This process involves constructing knowledge and experience through observing, asking questions, gathering information, associating, and communicating actively related to geosphere phenomena. To carry out this learning, it is necessary to assess self-regulated learning and environmental problem-solving ability. This article aims to develop a web-based self-assessment and environmental problem-solving ability test to accommodate community service activities. The self-regulated learning instrument refers to the learning independence from Shen et al, while the environmental problem-solving ability instrument refers to the Sanjaya indicator. The instrument was validated by learning and material experts. Furthermore, the test results produce a score of validity and reliability. The results showed that the test was successfully developed with the learning independence test having a validity score of 0.443-0.490 and a reliability of 0.452. The environmental problem-solving ability test obtained a validity value of 0.551-0.621 and a reliability value of 0.500. Based on the results of the development, the test instrument is ready to be used to assess self-regulated learning and environmental problem-solving. The test has also been able to support Geo-Inquiry based Community Service Learning.