Kansas-Lower Republican Basin TMDLs


KDHE has completed the first two rounds of TMDLs within the Kansas Lower Republican Basin based on the 1998, 2002, and 2004 303(d) lists. There are 98 TMDLs within the Kansas Lower Republican Basin that describe the strategies and goals to reduce pollution to achieve water quality standards. Of these, there are 40 that are high priority for implementation. KDHE develops TMDLs on a basin-by-basin approach and will revisit existing TMDLs and develop new TMDLs within the Kansas Lower Republican Basin in 2010.

The 2008 - Section 303(d) list submitted to and approved by EPA identifies watersheds associated with 45 stream chemistry sampling stations and eight biological monitoring stations as water quality impaired. There are 17 lakes and wetlands in the Kansas Lower Republican River Basin listed as water quality impaired. Among the streams: atrazine, lead, biological stressors, total suspended solids, total phosphorus and copper cause the greatest numbers of impairments. Among the lakes: eutrophic conditions indicative of excessive algae production were the predominant cause of impairment.

Other pollutants limiting the use of the Kansas Lower Republican River Basin streams include zinc, chloride, PCB, dissolved oxygen depletion, pH, and sulfate. Dissolved Oxygen depletion, siltation, lead, and pH caused additional lake and wetland impairments. Each parameter causing impairment requires a TMDL.