（1）生化需氧量（或称生化耗氧量，简称BOD），是在好氧条件下，水中有机物由微生物作用进行生物氧化，在一定时间内所消耗溶解氧的量。
（2）化学需氧量（或称化学耗氧量，简称COD），用强氧化剂（如重铬酸钾、高锰酸钾或碘酸钾等）在强酸和加热回流条件下对有机物进行氧化，并加入银离子作催化剂，把反应中氧化剂的消耗量换算成氧气量即为化学需氧量。化学需氧量越高，表示水中有机污染物越多。水中有机污染物主要来源于生活污水或工业废水的排放、动植物腐烂分解后流入水体产生的。水体中有机物含量过高可降低水中溶解氧的含量，当水中溶解氧消耗殆尽时，水质则腐败变臭，导致水生生物缺氧，以至死亡。
（3）总需氧量（TOD），指有机物完全被氧化的需氧量。
（4）总有机碳（TOC），表示污水中有机污染物的总含碳量。
（5）悬浮物，以悬浮状态存在于废水中的固形物。
（6）有毒物质，指达到一定浓度后，对人体健康、水生生物的生长造成危害的物质，其中非重金属的氰化物和砷化物及重金属中的汞、镉、铬、铅等是国际上公认的六大毒物。
（7）pH值，是反映水的酸碱性强弱的重要指标。
（8）大肠菌群数，指单位体积水中所含的大肠菌群的数目。
（9）溶解氧（DO），溶解氧量受水温、气压和溶质（如盐分）的影响，随水温升高而减少，与大气中氧分压成比例增加。由于水被污染，有机腐败物质和其他还原性物质的存在，溶解氧就被消耗，所以越干净的水，所含溶解氧越多；水污染越厉害，溶解氧就越少。
（10）氨氮，指以氨或铵离子形式存在的化合氨。氨氮是水体中的营养素，可导致水富营养化现象产生，是水体中的主要耗氧污染物，对鱼类及某些水生生物有毒害。氨氮主要来源于人和动物的排泄物，生活污水中平均含氮量每人每年可达2．5～4．5公斤。雨水径流以及农用化肥的流失也是氮的重要来源。另外，氨氮还来自化工、冶金、石油化工、油漆颜料、煤气、炼焦、鞣革、化肥等工业废水中。
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