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Table 2 Characteristics of community water systems (CWSs) at three average arsenic levels, 2005–2007, San Joaquin Valley, CA

From: Environmental justice implications of arsenic contamination in California’s San Joaquin Valley: a cross-sectional, cluster-design examining exposure and compliance in community drinking water systems

  Average arsenic concentration
CWS characteristics < 10 μg/L 10-49.9 μg/L ≥ 50 μg/L
% CWS 84.5 14.6 0.9
Mean Population Served (median) 2496 (180) 2277 (200) 127 (64)
% Privately owned, non-PUC Regulated 61 59 100
% < 200 Connections 70 66 100
Range of Mean Arsenic (μg As/L) 0-9.9 10.1-41.7 59.5-158
Mean μg As/L (Median) 3 (2) 19 (16) 97 (85)
Mean % of Sources > MCL (IQR) .1 (0,0) 87 (75, 100) 100 (100, 100)
CWSs with arsenic treatment plant 2 4 0
  1. IQR Interquartile range, PUC Public Utility Commission.