Yes, we have had dirt and dust in the run off. We were advised to hose off the roof if we had a reasonable hope of getting rainfall to cut down on the dirt. We had a consultant provided by the state who gave us plans for a filtering system I was able to build for myself. The filter canister is a 55 gallon plastic drum with three screens of graduated sizes. Dust and dirt still gets through but it screens out all the other loose debri. We have not planned on using the water for drinking or cooking. However, water could be run through a Berkeley filter for drinking and it would be just fine to drink.