1. Mobley Engineering, Inc, Norris, Tennessee, USA;
2. Gantzer Water Resource Engineering, Livingston, Texas, USA;
3. Aurora Water, Aurora, Colorado, USA;
4. Water Quality Solutions Inc, McGaheysville, Virginia, USA;
5. Casitas Municipal Water District, Oak View, California, USA;
6. Jacobs Engineering Group Inc, Mendota Heights, Minnesota, USA