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Kuwait Group aquifers and Dammam Formation are the two prominent aquifers, the wells tapping Dammam Formation and Dual completion wells are used for groundwater production. The current study investigates the spatiotemporal evolution of hydrochemical characteristics of the Shagaya water field utilizing long-term (1975-2019) hydrochemical data from 116 water wells. The Shagaya water well field has been differentiated into A to F sub-Fields. Mann-Kendall and Sen's Slope method along with spatial interpolation of change in TDS with time identified a significant decrease in TDS with time in the major portions of the Shagaya B, C, D, and E Fields. The study infers that 82% of wells extracting water from the Dammam Formation and 42% of Dual completion wells show a decrease in TDS concentration. The most plausible explanation for this phenomenon was the inflow of better-quality water from the up gradient parts of the Kuwait Group and the Dammam Formation aquifers due to the fall in the potentiometric head with high volume production in the well field. The results of ionic ratios (Na/Cl, Ca/Mg, Ca/SO 4 , Ca + Mg/SO 4 +HCO 3 ), isotopes ( 34 S, 87 Sr/ 86 Sr), relationships between 2 H and 18 O, and Ne/He and 3 He/ 4 He ratios identified that salinization was due to the result of rock-water interaction, ion exchange, mixing between groundwater of Kuwait Group and Dammam Formation and with groundwater from deeper parts of the aquifer. The long-term analysis of the data shows a notable variation of chemistry in a few locations and thus the study helps to manage, sustain groundwater resources, and protection of host aquifers., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022. Published by Elsevier Ltd.)

The sea water serves as a source for desalination and shelter for dependent biota. To understand the sources of metal in Kuwait Bay and the open sea, samples were collected and analyzed for metals like B, Li, Sr, Hg, Pb, Ba, Fe, Zn, Mn, Be, Cd, Co, Cr, Ni, Se, V, Al, Mo, and As. The comparison of Bay and Seawater shows that most of the metals were higher in sea water. Samples were collected in two different transects in the territorial sea water (TSW), the northern, and the southern transects. The heavy metal evaluation index and degree of contamination calculated for Bay and TSW show that they are contaminated, and the degree was higher in TSW. The variation of metal concentration along the transects in TSW reflects three different behaviors; (1) few metals decrease from the shore, (2) few increases from the shore, and (3) others show no significant trend. The statistical analysis of the data shows a representation of five factors for bay water and six for TSW indicating the complexity in sources of metal in TSW. The analysis infers the metal contamination due to petroleum products, and oxidation-reduction cycles are predominant in TSW. But, tidal influence along with dustfall plays a key role in the metal contamination of bay waters. Apart from these, desalination rejects and domestic sewage effluents are common sources contributing metals to both the environment. It is also observed that the suspended sediments play a significant role in the leaching, adsorption, and distribution of metals. The extraneous process has a predominant control over the distribution of the metals in TSW than the Bay.