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For surface waters, chlorination is a must if no other treatment is given. Hence residual chlorine test should be included in routine test. If you could add nitrate (NO3-), that would be fine. If excessive fluoride (F-) is reported in the area, then it could also be included in the field tests as you are doing Arsenic testing. Hardness is another important test and easy to test also which could be considered if that is a problem parameter in that area. I do not wish to lengthen the list. I have used field test kit and all the test I have mentioned could be included in field kit. Please note that these additional tests are required for drinking water and not irrigation or other domestic uses. Let me know if you need additional info or help. Best. Jagdish Barot, Windsor/Canada