WESTCAS is an organization of water and wastewater service providers who advocate for water resources in the arid southwest. We are active in both legislative and regulatory arenas on water-related issues that disproportionately impact our members. We seek to raise awareness of the unique character of arid regions and thereby prompt provisions in proposed legislation and rulemaking that are protective of water resources. Our collective voice has been effective in a wide array of water issues, notably whole effluent testing, arsenic drinking water standards, definition of waters of the US, drought response, floodplains, and quagga mussels.