In this study, we collected and analyzed water-level data of the Huanghua well in Hebei Province observed since 2005. We then combined the water-level data of the surrounding Hejian and Hengshui wells to analyze the water-level step-variation anomaly of the Huanghua well, taking the Changli M4.2 earthquake in Hebei as an example. The results show that the earthquake reflection ability of the water level of the Huanghua well is good. Since 2015, the water-level step-variation anomaly of the Huanghua well and the water-level anomalies in the Hejian and Hengshui wells have shown a certain correspondence. As a short-term precursor anomaly, water-level change is caused by tectonic activity, which is related to the Changli M4.2 earthquake.