Clark County is Nevada’s largest county located in the southern most portion of the state. The incorporated citiies in Clark County include; Las Vegas, Henderson, North Las Vegas, Boulder City and Mesquite. The county’s population of over two million residents additionally hosts over 42 million visitors each year. Tourism is the biggest industry of Clark Couty accounting for nearly $36 billion in spending each year by the county’s visitors. The public health agency for Clark County is the Sothern Nevada Health Distirct. The District provides services to both the residents and visitors of Clark County. While the marketing slogan “What happens in Vegas, stays in Vegas” may be true for some vistors, outbreaks of illness that occur in Clark County garner nationwide attention. Outbreaks can also cost the implicated facilites litigation costs as victims of the outbreak sue the owners for damages. As a result of the national attention of outbreaks in Clark County, SNHD has developed tools to ensure that outbreaks of disease are limited to the greatest extent possible. One such example is the District’s response to reports of Legionellosis. Between 2001 and 2011, SNHD investigated seven outbreaks of legionellosis. Two of the outbreaks in 2011 gained the attention of the national media. As a result of this attention, SNHD developed a program in 2012 to conduct environmental investigations for every reported case of ld. The goal was to prevent outbreaks by determining if a property has an issue with Legionella pneumophila contamination and properly addressing the contamination to prevent an outbreak of legionellosis at the facility. Using experience in investigating these previous outbreaks, SNHD staff developed a procedure to investigate every case of legionellosis reported to it that may have had an exposure at a permitted facilty such as a hotel, or pool, or other area accessible by the public. These investigations were completely voluntary for the facilities’ and were not compulsory. The investigations included conducting an environmental assessment of the facility and taking water samples from various sources of exposure. These samples were shipped to an ELITE commercial laboratory to be tested for the presence of Legionella bacteria. Based upon the results of these investigations, SNHD staff would make reccomendations to the facilty to ensure that the presence L. pneumophila if found was corrected. Prior to implementation of this aggressive program, SNHD staff conducted a number of trainings to make the stakeholders in the tourism industry aware of the problem Legionellosis poses to Clark County along with the District’s change in investigating these reports and outbreaks. The training was well received and has resulted in the industry’s full cooperation in allowing SNHD to conduct these investigations. To date, the District has not been allowed to provide assitance to the industry when it recieves a report of legionellosis. In 2016, the program was slightly modified to improve its sustainablity by decreasing the number of samples, and requiring facilites to cover the cost of testing at the commercial laboratory. Also, since the implementation of the investigation program, there has yet to be an outbreak of legionellosis occurign in Las Vegas. Based on SNHD’s previous expierince, there would be an expectation of one or two outbreaks to occur in the the four years that the program has been practiced.