Results from simulations that incorporate distributions of exposure error to produce multivariate-adjusted odds ratios and 95% confidence intervals for arsenic in drinking water and bladder cancer, among those who consume >1 L/day of water from home; southeastern Michigan, enrolled 2002-2006. Adjusted for cigarette smoking history, education, history of employment in high-risk occupation, family history of bladder cancer, age, race, and sex. Risk per 5 μg/L increase in time-weighted average arsenic concentrations. Simulations are presented in sequence from low to high odds ratios.