Gather all ingredients.
Stir water, vinegar, sugar, and sea salt together in a saucepan over high heat; bring to a boil. Remove from the heat and cool completely.
Combine cucumber spears, garlic cloves, and fresh dill in a large glass or plastic lidded container.
Pour cooled vinegar mixture over cucumbers, garlic, and dill.
Seal container with lid and refrigerate for at least 3 days.
