Hafiyyan, Titan (2026) Pemetaan Kualitas Airtanah Dangkal dan Analisis Intrusi Air Laut Daerah Mengkirau, Kecamatan Tasik Putri Puyu, Kabupaten Kepulauan Meranti, Provinsi Riau. Other thesis, Universitas Islam Riau.

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Abstract

The Mengkirau area is one of the areas directly adjacent to the Asam Strait which is highly dependent on the presence of groundwater as a source of clean water used in daily life. However, shallow groundwater in residential areas close to the sea has a brackish-salty taste and causes rust on cutlery. The purpose of this study were to determine the distribution and direction of flow, map groundwater quality, map groundwater feasibility and map the level of seawater intrusion in the study area. The results of the physical-chemical parameter measurements were compared with the Minister of Health Regulation No. 2 of 2023 concerning environmental health quality standards for hygiene and sanitation or clean water purposes. Based on the results of the study, the color of the groundwater in the study area were yellow (62%) and reddish brown (38%). The taste of the groundwater in the study area were tasteless (50%), brackish (38%) and salty (12%). The groundwater in the research area has no odor (100%). The TDS of the groundwater ranged from 34 – 4265 mg/L. The DHL of the groundwater ranged from 69,2 – 8.372 µS/cm. Groundwater salinity ranges from 0,03 – 4,71 ppt. Groundwater pH ranges from 4,03 – 8,92. Groundwater Fe content ranges from 0.14 - 3.09 mg/L. Groundwater Mn content ranges from 0,04 - 0,99 mg/L. Groundwater Cl - content ranges from 0 to 1.293 mg/L. Groundwater CO3 2- content ranges from 4,96 – 2.506 mg/L. Groundwater HCO3 - content ranges from 0 – 72,0 mg/L. According to Minister of Health Regulation No. 2 of 2023, from all the results of physical and chemical parameter measurements, it can be seen that all groundwater samples do not meet the required standards so that the groundwater is categorized as unsuitable for use for hygiene and sanitation purposes. Analysis of the level of seawater intrusion shows that 4 stations (25%) have no influence of salt water, 1 station (6%) has a small influence of salt water, 4 stations (25%) have a moderate influence of salt water, 6 stations (38%) have a large significant influence of salt water, 1 station (6%) has a large influence of salt water.

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