| Model | Unstandardized Coefficients | Standardized Coefficients | t | Sig. | ||
| B | Std. Error | Beta | ||||
| 1 | (Constant) | 1.412 | 0.230 | 6.143 | 0.000 | |
| BOD | −0.011 | 0.006 | −0.277 | −1.697 | 0.094 | |
| COD | 0.030 | 0.004 | 1.196 | 7.298 | 0.000 | |
| TDS | −0.003 | 0.001 | −0.311 | −2.438 | 0.017 | |
| TC | −6.162E−7 | 0.000 | −0.462 | −1.140 | 0.258 | |
| FC | 2.668E−6 | 0.000 | 0.509 | 1.272 | 0.208 | |