The invention relates to the use, in a cosmetic or dermatological composition, of a particular water having a pH of between 7.8 and 10 and a total dissolved solids (TDS) concentration of between 10 and 250 mg/l. The invention also relates to a cosmetic or dermatological composition containing this water.The invention relates in particular to a treatment method intended for preventing or delaying the appearance of the effects of intrinsic and/or extrinsic ageing of the skin, or for slowing down the effects thereof； for preventing or reducing pigmentary spots on the skin, or the coloration of hyperpigmented areas of skin； for reducing the pigmentation of the periphery of depigmented areas； for improving the uniformity of the skin coloration； or for lightening the complexion of the skin.
