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This paper explores the relationship between episodes of contaminated drinking water and health care expenditures in the United States. The analysis relies on panel data from the 48 contiguous states from 2000 to 2011. We use the population served by public water systems that violate health-based standards of the Safe Drinking Water Act as a proxy for contaminated drinking water. We estimate spatial and non-spatial models and control for factors that may aect per capita health care expenditures including variables that reect air quality violations along with ability to pay plus demand for and supply of health care services. The results from a Spatial Durbin Model indicate that a 1% decrease in the percentage of population exposed to drinking water quality violations is associated with reductions in in-state and regional eects equal to 0.005% ($0.32) and 0.035% ($2.26) of per capita health care expenditures, respectively. Drinking water violations have a larger impact on expenditures than air quality violations (whose eects are not statistically dierent from zero). However, compared to other factors, such as Medicare enrollment and income, the impact of these violations on health care expenditures is relatively small. We nd that regional health care expenditure impacts from drinking water violations are substantially greater than in-state impacts. Thus, a regional approach is recommended to addressing drinking water quality improvements.

Background: In dentistry most of the medical emergency considered to be mild, and in some situation it can be very serious. The objective of our study is to assess knowledge and awareness of dental general practitioner, preparedness of dental clinic/team and the prevalence of most common medical emergencies encountered in dental clinics.Methods: This is a cross sectional study using self-administrated electronic questionnaire conducted on dental general practitioners (GPs) working in kingdom of Saudi Arabia during the months of January and February 2018 were recruited.Results: Less than half of the participants (47.3%) usually check vital signs before surgical extraction only and 42% before simple and surgical extraction and 8% before simple extraction only. Only 46.4% of the participants have experienced at least one medical emergency throughout their career. The most common medical emergency encountered is vasovagal syncope followed by hypoglycaemia and seizures, respectively. Majority of GPs have valid BLS and no one answered all question correctly.Conclusions: There are serious problems regarding the knowledge among dental GPs. Further studies needed to assess the education of medical emergency in schools of dentistry.