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CHARLOTTE, N.C. -- The Charlotte-Mecklenburg Police Department is offering a cash reward for information related to illegal dumping earlier this year.

The utilities department says it continues to test samples from the local wastewater plants after the incident at Mallard Creek Wastewater Treatment Plant in Februrary.

CMUD says biosolids have tested with high amounts of Polychlorinated biphenyls (PCBs) since then. This is true also for the McAlpine Creek plant, where officials say dumping may have occurred in recent months, as well.

City officials say the plants can be very effective at removing PCB and levels at the McAlpine Creek plant come in at .7, which is less than the EPA guideline of 3.0. Like the first instance, drinking water has not been affected.

PCB contaminated biosolids at McAlpine are stored inside a very large, fully-enclosed building until they can be properly disposed. The city is working to determine how much disposal options will cost.

Police are still investigating this. CMPD has announced it will offer a $10,000 reward for tips leading to an arrest.

Anyone who notices illegal dumping should call 911.

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