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