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CMUD and private laboratories continue testing water quality and site cleanup continues at the Mallard Creek wastewater treatment plant following the illegal waste dumping into the sanitary sewer system discovered on February 6. The city drinking water supply was not affected by this incident. Your drinking water is safe to drink, bathe and cook with.
The Mallard Creek wastewater treatment plant is operating normally. Lab results indicate plant personnel have effectively contained nearly all of the contaminated material and continue to safely treat and discharge the community‚Äôs wastewater. The Polychlorinated biphenyl (PCB)-  and Trichlorobenzene (TCB)- tainted material that was captured is being disposed of properly and will take time. Until all PCBs and TCBs have been removed from the plant site, CMUD advises residents to avoid human and pet contact with Mallard Creek, from the Mallard Creek wastewater plant site near the Mecklenburg/Cabarrus border (along Mallard Creek downstream into Cabarrus, Union & Anson counties). This advisory is issued purely as a safety precaution, and remains in effect until further notice.
The charts below illustrate any detectable levels of PCB or TCB found in treated wastewater effluent that is released from the plant back into the creek, and any levels of those two contaminants present in the creek. Please note:
  • Water quality sampling data is incomplete and subject to further review and correction.
  • While some levels may be greater than target values (particularly early in the illegal dumping event), plant staff have significantly reduced PCBs and TCBs by adjusting wastewater treatment processes to meet the challenge.
  • Graphs reflect daily averages, not necessarily results of each sample taken on a given day. To review a specific sample result used to populate these graphs, click on the effluent and creek tables below.
  • Each daily average or individual sample with non-detectable results is displayed in the table (and factored into the graph) not as a zero, but as the lowest detectable number (usually 0.5 parts per billion/ppb for PCB and 3 ppb for TCB).
  • While sample results generally have remained stable during the past several weeks, water quality sampling and updates continue until site cleanup is complete and the creek advisory is lifted.
  • Our goal is to update information on this site each week.