A water-soluble pesticidal formulation approximately comprising in grams per liter 10 to 500 of at least one pyrethroid, 10 to 200 of a non-polar solvent having a solubility in water at 20.degree. C. of 0.01 to 15 g/liter, 20 to 500 of at least one non-ionic emulsifier, 5 to 250 of at least one anionic emulsifier, up to 300 of a solvent having a solubility in water at 20.degree. C. of at least 30 g/liter, up to 5 of a dyestuff, up to 50 of auxiliaries and up to 900 of water. The formulation will dissolve in water to give clear solutions.