2026-05-052026-05-052025-12-28https://repositorio.ifal.edu.br/handle/123456789/3036Water is an essential resource for the maintenance of life and the stability of ecosystems, and its preservation and quality are fundamental factors for environmental sustainability. In addition to acting as a vector for infectious diseases, water also serves as an important indicator of contemporary environmental impacts. This study aimed to evaluate the water quality of the Mundaú Lagoon, located among the municipalities of Maceió, Santa Luzia do Norte and Coqueiro Seco, which is part of the Mundaú-Manguaba Estuarine-Lagoon Complex (CELMM). The study area has attracted increasing scientific interest due to the presence of rock salt (halite) mines, which provide raw material for the production of caustic soda, hydrochloric acid, sodium bicarbonate, soap, detergents, cleaning products, and pharmaceuticals. The mining company responsible for this activity drilled wells and injected water into the salt layer, producing brine that was then pumped to the surface. This process, carried out for more than four decades, caused structural and physicochemical alterations in the subsurface environment. The contact between the lagoon water and saline material from mineral deposits can significantly alter its natural quality pattern, increasing salinity and affecting the aquatic dynamics of the ecosystem. To assess these impacts, a monthly monitoring program was conducted, comparing the results with the standards established by the brazilian Ministry of Health (MS) and the brazilian National Environmental Council (CONAMA). Physical parameters (pH, turbidity, electrical conductivity, color, dissolved oxygen, and temperature), chemical parameters (total hardness, calcium, magnesium, alkalinity, chlorides, and acidity), and microbiological parameters (total and thermotolerant coliforms) were analyzed at five sampling points in the municipality of Coqueiro Seco, approximately 21.4 km from Maceió. Results showed that some points, particularly Points 4 and 5, exhibited elevated turbidity, conductivity, and salinity values, suggesting anthropogenic influence and possible mineral pollution. Microbiological analyses indicated high concentrations of thermotolerant coliforms, classifying the water as unsuitable for domestic and recreational use due to the potential risk of waterborne diseases transmission. Overall, the results demonstrate that anthropogenic activities in the region have significantly contributed to the degradation and decline in the surface water quality of the Mundaú Lagoon.ptQualidade da águaLaguna MundaúExtração de sal-gemaParâmetros físico-químicosColiformes termotolerantesImpactos antrópicosWater qualityMundaú LagoonRock salt extractionPhysicochemical parametersThermotolerant coliformsAnthropogenic impactsDissertaçãoOUTROS