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小浪底水库蓄水后将打破库区原来的自然平衡状态，产生一系列的环境工程地质问题。分析认为，小浪底水库具有产生水库诱发地震的可能性，可能诱震断裂为城崖地、塔底和石井河断层，震级上限为5．5级；不存在永久渗漏问题，对新安煤矿的开采会产生一定的影响，应增加相应的排水措施和加强掘进过程中的地质探查、预报工作；会造成一些老滑坡复活及黄土塌岸问题，黄土塌岸主要发生在库区中部的垣曲古城附近，对滨库地带的居民点有一定影响；蓄水后不会因岩土中存在有害物质造成水质恶化问题，但对某些元素应进行监测工作。
Xiaolangdi reservoir water will break the original natural balance of the reservoir area, resulting in a series of environmental engineering geological problems. The analysis shows that the Xiaolangdi Reservoir has the possibility of generating reservoir-induced earthquakes and may induce the seismogenic fault to be the cliff of City Cliff, the bottom of the tower and the Shijing River fault with an upper magnitude of 5.5. There is no problem of permanent seepage, Will have a certain impact, should increase the corresponding drainage measures and to strengthen geological exploration during excavation process, forecasting; will cause some of the old landslide resurgence and loess bankruptcy, loess bank collapse occurs mainly in the vicinity of the ancient city of Yuanqu , Which has some impact on the settlements in the reservoir area. After the impoundment, the water quality will not be deteriorated due to the presence of harmful substances in the soil, but some elements should be monitored.