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Checking and monitoring water quality pollution is an important thing to do. In general, tourist areas are more susceptible to water pollution. The Peukan Bada subdistrict area has Ujung Pancu beach with a length of ± 2 km and is a marine area that plays an important role for the surrounding community. The development of human activities that occur around coastal areas will have an impact on water pollution. The aim of this research is to determine the level of pollution that occurs in the waters of Ujung Pancu Beach using the Pollution Index method based on physicochemical measurements. Water quality values are measured based on water quality standards for marine tourism purposes in the Minister of Environment Decree No. 22 of 2021. Based on the results of the analysis carried out, the result was that the level of pollution obtained was moderate pollution. The average value obtained at high tide is around 8.09 and at low tide around 8.47. Overall, the water quality parameters of Ujung Pancu beach need to be considered so that they are maintained so that they do not have a negative impact on tourist visits and marine tourism activities.

Lake Rawa Pening is a natural lake in the Semarang Regency of Central Java Province, Indonesia, and its existence is pivotal to the surrounding communities as it provides ecological, economic, and social benefits. The ecosystem health of Rawa Pening can be represented by chlorophyll-a concentration because it indicates phytoplankton biomass, nutrient availability, and fish resources. Hence, the present study aims to disentangle the monthly variability of surface chlorophyll-a in Rawa Pening Lake by analyzing water samples that were collected once a month from nine stations within five-month observations (September 2020 to January 2021). The samples were analyzed using spectrophotometric method. Results showed that the highest surface chlorophyll-a concentration (23.33 mg/m3) took place in December, while the lowest concentration (12.64 mg/m3) occurred in October. The monthly variability of surface chlorophyll-a was likely controlled by variation of rainfall, with the highest (18.72 mm) and the lowest (12.33 mm) rainfall happened in December and October, respectively. The present study also indicates the anthropogenic activities such as agricultural activities, floating food stands, aquaculture, and tourist boats may contribute to surface chlorophyll-a variability in Rawa Pening Lake. [ABSTRACT FROM AUTHOR]