Table 3.
Distribution of water contaminants.
| Pollutants | Total study population | Hypertensive disorders in pregnancy | MCLa | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N = 2,788,600 | N = 147,146 (5.28%) | ||||||||||||
| Min | 25th | 50th | 75th | Max | Mean (SD) | Min | 25th | 50th | 75th | Max | Mean (SD) | ||
| Arsenic | <MDL | 0.20 | 0.79 | 1.66 | 32.09 | 1.29 (2.06) | <MDL | 0.16 | 0.79 | 1.66 | 32.09 | 1.27 (2.03) | 10 |
| Cadmium | <MDL | <MDL | <MDL | <MDL | 4.17 | 0.01 (0.08) | <MDL | <MDL | <MDL | <MDL | 4.17 | 0.01 (0.08) | 5 |
| DBCP | <MDL | <MDL | <MDL | <MDL | 1.29 | 0.02 (0.07) | <MDL | <MDL | <MDL | <MDL | 1.29 | 0.02 (0.08) | 0.2 |
| Hex Chrom | <MDL | <MDL | 0.49 | 1.57 | 362.60 | 2.77 (19.80) | <MDL | 0.75 | 0.56 | 1.62 | 362.60 | 2.77 (18.35) | NA |
| Lead | <MDL | <MDL | <MDL | 0.02 | 205.13 | 0.19 (3.60) | <MDL | <MDL | <MDL | 0.03 | 205.13 | 0.18 (3.02) | 15 |
| Nitrate | 1.41 | 1.75 | 5.71 | 10.82 | 85.48 | 7.70 (7.29) | 1.41 | 1.75 | 5.71 | 10.39 | 85.48 | 7.62 (7.20) | 10 |
| Perchlorate | <MDL | <MDL | <MDL | <MDL | 5.35 | 0.17 (0.64) | <MDL | <MDL | <MDL | <MDL | 5.35 | 0.16 (0.61) | 6 |
| PCE | <MDL | <MDL | <MDL | 0.09 | 16.43 | 0.16 (0.86) | <MDL | <MDL | <MDL | 0.09 | 16.43 | 0.16 (0.85) | 5 |
| Radium | <MDL | <MDL | <MDL | 0.16 | 10.96 | 0.15 (0.44) | <MDL | 0.75 | <MDL | 0.13 | 10.96 | 0.15 (0.53) | 5 pCi/L |
| TCE | <MDL | <MDL | <MDL | 0.07 | 21.49 | 0.30 (1.44) | <MDL | <MDL | <MDL | 0.08 | 21.49 | 0.30 (1.29) | 5 |
| TCP | <MDL | <MDL | <MDL | <MDL | 1.41 | 0.00 (0.02) | <MDL | <MDL | <MDL | <MDL | 1.41 | 0.00 (0.02) | 0.005 |
| THM | <MDL | 7.07 | 27.91 | 44.86 | 96.80 | 27.35 (19.82) | <MDL | 6.15 | 25.96 | 45.23 | 96.80 | 26.94 (19.87) | 80 |
| Uranium | 0.71 | 0.87 | 1.89 | 3.10 | 137.65 | 2.69 (3.65) | 0.71 | 0.75 | 1.84 | 3.02 | 137.65 | 2.60 (3.61) | 20 pCi/L |
| MCL-V | <MDL | <MDL | <MDL | <MDL | 30.00 | 0.19 (0.74) | <MDL | <MDL | <MDL | <MDL | 30.00 | 0.18 (0.69) | NA |
| TCR-V | <MDL | <MDL | <MDL | <MDL | 32.52 | 0.47 (2.41) | <MDL | <MDL | <MDL | <MDL | 32.52 | 0.45 (2.35) | 5% |
aμg/L unless otherwise noted.
DBCP indicates 1,2-Dibromo-3-chloropropane; Hex Chrom, hexavalent chromium; MDL, maximum detection limit; NA, not applicable; PCE, tetrachloroethylene; TCE, Trichloroethylene; TCP, 1,2,3-trichloropropane; THM, trihalomethane.