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Minqin County of our province is located between Tengger Desert and Badain Jaran Desert. Due to natural and human factors, there are groundwater table decline, land desertification and rivers.
A, washing the toilet urinal with vegetable washing water is a multi-purpose water, which can save water, so A is correct;

B, irrigation farmland from flood irrigation to drip irrigation can save water, so B is correct;

C, irrigation of farmland with domestic sewage will pollute the soil, affect the quality of food crops and endanger human health, so C is wrong;

D, surface water purification and reuse can save water resources, so D is correct.

So choose: C.