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Pesticide users could be pouring the chemicals or rinse from containers down drains that go to the sanitary sewer lines. There could also be seepage of contaminated water at manholes or there could be overflow seepage during high storm water runoff events carrying some of these chemicals. However, if this is occurring on a regular basis, it is an indication that sewer pipes have cracks or have been degraded from corrosion. Sewer pipes to the wastewater treatment plant may have deteriorated to the point that shallow ground water contaminated with such chemicals is infiltrating into the sewer lines where they transverse the landscape. Some wastewater treatment plants have had trouble meeting toxicity requirements of their discharge permit due to pesticide contamination from shallow groundwater seepage into sewer lines. |
