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Table 1 Exposure and Population Statistics for Counties in Southeastern Michigan Study Area

From: Arsenic in drinking water and cerebrovascular disease, diabetes mellitus, and kidney disease in Michigan: a standardized mortality ratio analysis

  Genesee County Huron County Lapeer County Sanilac County Shiawassee County Tuscola County Six Counties Combined Remainder of Michigan
Number of Groundwater Samples Analyzed 2,768 2,068 2,419 729 822 445 9,251 23,691
% of Population Drinking Groundwater 50% 84% 82% 95% 100% 100% 68% 44%
Population-weighted Mean Arsenic Concentration (μg/L) 10.42 12.21 19.26 9.97 6.66 8.08 11.00 2.98
Population-weighted Median Arsenic Concentration (μg/L) 8.48 3.50 11.98 4.61 3.91 3.32 7.58 1.27
Population Size 430,459 34,951 74,768 39,928 69,770 55,498 705,383 8,589,914
White Race (%) 78% 99% 98% 98% 98% 97% 86% 74%
Residing in a Rural Area (%) 21% 90% 86% 100% 66% 88% 44% 30%
Lived in Same County 5 Years Earlier (%) 90% 89% 78% 82% 84% 85% 87% 83%
Population (above age 25) with at Least a Bachelor's Degree 13% 9% 9% 8% 10% 8% 11% 17%
Persons Below Poverty Level (%) 16% 15% 8% 14% 11% 13% 14% 13%
Median Household Income $31,030 $21,852 $35,874 $23,107 $30,283 $27,374 $30,332 $31,020
  1. Arsenic data collected from 1983–2002, provided by Michigan Department of Environmental Quality.
  2. US Maximum Contaminant Limit for public drinking water supplies is 10 μg/L.
  3. Population statistics from US Census, 1990.