. Author manuscript; available in PMC: 2018 May 1.

Published in final edited form as: Am Econ Rev. 2017 May;107(5):522–525. doi: 10.1257/aer.p20171133

Table 1. Summary Statistics.

	Mean	SD
CWS characteristics
Population served per CWS	787	1,876
Number of intakes per CWS	2.89	2.37
Observations	424
Water sampling characteristics
log(SCD water contaminant)	0.84	0.19
Well pads drilled within “d” km of water sample's intake
0.5 km	0.02	0.16
1 km	0.10	0.40
1.5 km	0.24	0.66
2 km	0.45	1.10
10 km	12.9	21.3
Observations	54,809