From: Water quality monitoring records for estimating tap water arsenic and nitrate: a validation study
Radius (maximum distance between residence and water source, miles) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
All residences (N = 105) | |||||||||||
% with monitoring data in radius | 50 | 72 | 87 | 92 | 94 | 98 | 100 | 100 | 100 | 100 | 100 |
Agreement* | |||||||||||
All sources in radius | |||||||||||
Mean | 0.49 | 0.44 | 0.39 | 0.34 | 0.34 | 0.30 | 0.32 | 0.32 | 0.31 | 0.32 | 0.34 |
Maximum | 0.37 | 0.37 | 0.27 | 0.26 | 0.28 | 0.28 | 0.33 | 0.29 | 0.29 | 0.29 | 0.25 |
Most recent | 0.38 | 0.17 | 0.31 | 0.32 | 0.25 | 0.27 | 0.31 | 0.30 | 0.28 | 0.21 | 0.18 |
Closest source only | |||||||||||
Mean | 0.34 | 0.32 | 0.25 | 0.25 | 0.25 | 0.24 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
Maximum | 0.19 | 0.26 | 0.19 | 0.20 | 0.19 | 0.21 | 0.20 | 0.20 | 0.20 | 0.20 | 0.20 |
Most recent | 0.35 | 0.33 | 0.24 | 0.24 | 0.23 | 0.22 | 0.21 | 0.21 | 0.21 | 0.21 | 0.21 |
Residences on a public system† (N = 87) | |||||||||||
% with monitoring data in radius | 47 | 72 | 87 | 92 | 94 | 99 | 100 | 100 | 100 | 100 | 100 |
Agreement* (mean, all sources in radius) | 0.49 | 0.39 | 0.35 | 0.29 | 0.29 | 0.24 | 0.29 | 0.30 | 0.28 | 0.31 | 0.35 |
Residences with a private well‡(N = 18) | |||||||||||
% with monitoring data in radius | 61 | 72 | 83 | 94 | 94 | 94 | 100 | 100 | 100 | 100 | 100 |
Agreement* (mean, all sources in radius) | 0.14 | 0.60 | 0.40 | 0.51 | 0.47 | 0.44 | 0.47 | 0.46 | 0.43 | 0.41 | 0.40 |