Table 2.
Chemical Distribution at Sampled Homes in Bradford County, PA and Belmont and Monroe Counties, OH
| PA |
OH |
|||||||
|---|---|---|---|---|---|---|---|---|
| Chemical | LOQ (μg/L) | >LOD (%) | Median (IQR) (μg/L) | LOQ (μg/L) | >LOD (%) | OH Median (IQR) (μg/L) | USEPA MCLc(μg/L) | WHO GVc (μg/L) |
| Organic chemicals (PA n = 89 homes and OH n = 161) | ||||||||
| Bromochloromethane | 0.172 | 97 | 0.52 (0.42, 0.63) | 0.050 | 46 | <LOD (<LOD, 0.08) | NS | NS |
| Chloroform | 0.182 | 76 | 0.09 (0.009, 0.19) | 0.050 | 22 | <LOD (<LOD, <LOD) | NS | 300 |
| 1,2-Dichloroethane and benzenea | 0.059 | 75 | 0.02 (<LOD, 0.04) | 0.092 | 24 | <LOD (<LOD, <LOD) | 5 | 10 |
| Trichloroethene | 0.047 | 75 | 0.04 (0.008, 0.06) | 5 | 20 | |||
| Toluene | 0.047 | 64 | 0.01 (<LOD, 0.03) | 0.046 | 20 | <LOD (<LOD, <LOD) | 1000 | 700 |
| Bromomethane | 0.079 | 58 | 0.02 (<LOD, 0.06) | 0.053 | 67 | 0.012 (<LOD, 0.04) | NS | NS |
| Dibromomethane | 0.775 | 45 | <LOD (<LOD, 0.12) | NS | NS | |||
| 1,1-Dichloroethene and trans-1,2-dichloroethened | 0.087 | 42 | <LOD (<LOD, 0.02) | 100 | NS | |||
| Vinyl chloride | 0.047 | 26 | <LOD (<LOD, 0.0004) | 0.046 | 57 | 0.003 (<LOD, 0.023) | 2 | 0.3 |
| m-Xylene and p-xyleneb | 0.064 | 24 | <LOD (<LOD, <LOD) | 10,000 | 500 | |||
| Inorganic chemicals (PA n = 94 homes and OH n = 161) | LOD (μg/L) | >LOD (%) | LOD (μg/L) | >LOD (%) | ||||
| Arsenic | 0.110 | 81 | 0.99 (0.36, 2.44) | 0.110 | 8 | <LOD (<LOD, <LOD) | 10 | 10 |
| Barium | 0.027 | 100 | 166.03 (76.99, 399.46) | 0.027 | 99 | 88.48 (50.74, 142.80) | 2000 | 1300 |
| Bromide | 0.008 | 34 | <LOD (<LOD, 71.29) | 0.008 | 53 | 27.00 (<LOD, 54.00) | NS | NS |
| Calcium | 0.051 | 99 | 34,961 (20,968, 42,863) | 0.051 | 100 | 72,101.19 (51,144.44, 101,596.12) | NS | NS |
| Chloride | 0.550 | 100 | 5831 (3035, 16,128) | 0.550 | 99 | 6758.00 (3018.00, 19,785.00) | 250,000c | 250,000c |
| Fluoride | 0.040 | 80 | 82.37 (44.42, 114.2) | 0.040 | 100 | 110.00 (82.00, 156.00) | 4000 | 1500 |
| Iron | 0.017 | 70 | 60.37 (<LOD, 139.02) | 0.017 | 51 | 10.74 (<LOD, 32.70) | 300c | 300c |
| Lead | 0.050 | 96 | 1.27 (0.72, 2.05) | 0.050 | 12 | <LOD (<LOD, <LOD) | 15 | 10 |
| Lithium | 0.002 | 100 | 23.33 (8.27, 51.95) | 0.002 | 99 | 10.24 (6.79, 15.22) | NS | NS |
| Magnesium | 0.034 | 99 | 6767 (3526, 9845) | 0.034 | 100 | 16,116.57 (8870.02, 27,149.45) | NS | NS |
| Manganese | 0.004 | 91 | 17.1 (0.94, 127.51) | 0.004 | 58 | 1.84 (<LOD, 19.25) | 50c | 100c |
| Nitrate | 0.039 | 67 | 334.35 (<LOD, 1009.63) | 0.039 | 99 | 560.00 (100.00, 1754.00) | 10,000 | 50,000 |
| Potassium | 0.012 | 100 | 1467.52 (1050.14, 1830.6) | 0.012 | 100 | 1489.75 (1148.41, 2038.67) | NS | NS |
| Sodium | 0.420 | 100 | 16,130 (7282, 46,386) | 0.420 | 100 | 23,819.14 (16,740.71, 52,714.46) | NS | 200,000c |
| Strontium | 0.004 | 100 | 472.04 (179.83, 1037.06) | 0.004 | 100 | 526.48 (288.57, 967.63) | NS | 250,000c |
| Sulfate | 0.085 | 100 | 10,063 (6847, 15,648) | 0.085 | 96 | 30,813.00 (20,117.00, 50,587.00) | 250,000c | 250,000c |
| Uranium | 0.001 | 85 | 0.87 (0.24, 2.56) | 0.001 | 16 | <LOD (<LOD, <LOD) | 30 | 30 |
Standard listed is for the chemical benzene only.
Standard listed is the sum of standards for total xylenes.
A secondary MCL (related to taste, odor, or other aesthetic qualities) is reported for chemicals with no health-based MCL.
Out of 64 total samples for PA. Samples from 5 (5%) of PA homes were not reported due to the evidence of contamination or other factors, such as leaks or breakage. Twenty-five additional PA samples lack measurements of 1,1-dichloroethene and trans-1,2-dichloroethene only.
IQR: interquartile range; LOQ: limit of quantification; LOD: limit of detection; MCL: maximum contaminant level; WHO: World Health Organization; GV: guidance value; and NS: no standard.