Will drinking water pass a urine test for hydrocodone?

Drinking water before a urine test for hydrocodone can dilute the urine, potentially affecting the concentration of the drug detected. However, it is unlikely to completely mask the presence of hydrocodone if it is in your system, as labs often test for dilution and may flag samples that are overly diluted. If you have taken hydrocodone, it will generally still be detectable in your urine regardless of water intake.