Help Owasso Win! Take the Mayor's Challenge for Water Conservation at mywaterpledge.com. This friendly competition between cities from across the nation allows communities to come together around a common purpose of reducing water waste and water pollution. We can all make a difference! Small, consistent changes in the way we use water can have a big impact on our nation’s water resources! It only takes a few minutes and by participating you can help the environment and support Owasso.