Table 3. Distribution of Chemicals Detected in Tap Water Samples Collected October–November 2019 from the Fire and Water Study Homes (N = 136).
| detections |
concentration (μg/L)a |
|||||||
|---|---|---|---|---|---|---|---|---|
| chemical | MDL (μg/L) | N | % | mean | std dev | median | min | max |
| bromodichloromethane | 0.20 | 96 | 71 | 2.74 | 1.04 | 2.80 | 0.26 | 6.80 |
| benzene | 0.11 | 2 | 1 | 0.23 | 0.09 | 0.23 | 0.16 | 0.29 |
| bromoform | 0.46 | 6 | 4 | 1.72 | 0.15 | 1.65 | 1.60 | 1.90 |
| chlorodibromomethane | 0.22 | 7 | 5 | 1.56 | 1.34 | 0.83 | 0.52 | 3.60 |
| chloroform | 0.14 | 106 | 78 | 31.66 | 14.68 | 31.00 | 0.14 | 67.00 |
| methylene chloride | 0.21 | 26 | 19 | 1.79 | 2.53 | 0.62 | 0.48 | 9.20 |
| methyl ethyl ketone | 3.3 | 2 | 1 | 34.00 | 7.07 | 34.00 | 29.00 | 39.00 |
| methyl tert-butyl ether | 0.14 | 1 | 1 | 0.67 | 0.67 | 0.67 | 0.67 | |
| tetrahydrofuran | 5.2 | 3 | 2 | 1201.67 | 1580.21 | 570.00 | 35.00 | 3000.00 |
| trichloroethene | 0.19 | 1 | 1 | 0.49 | 0.49 | 0.49 | 0.49 | |
| trihalomethanes, total | 0.97 | 109 | 80 | 33.47 | 16.20 | 33.00 | 1.20 | 71.00 |
| o-xylene | 0.13 | 3 | 2 | 0.36 | 0.06 | 0.39 | 0.30 | 0.40 |
| xylenes, total | 0.47 | 2 | 1 | 0.60 | 0 | 0.60 | 0.60 | 0.60 |
a
Distribution among samples with detects.