Table 3.

Load matrix of the principal components of each water quality index.

	Component	1	2	3
Item
pH		0.597	0.503	−0.287
EC		−0.611	0.665	−0.067
DO		−0.347	−0.722	0.379
BOD		−0.066	0.720	0.235
TP		−0.635	−0.204	0.458
NO3-N		0.941	−0.060	−0.129
NO2-N		0.915	−0.028	0.243
NH3-N		0.932	−0.141	0.089
NTU		0.678	−0.004	0.581
SS		−0.015	0.666	0.602