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2017-05-10 CC Packet
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2017-05-10 CC Packet
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Discussion <br />The concentration of the microbes/genetic material found during this one -day sampling effort is not <br />unusual, especially given the pond can be accessed by water fowl and other wildlife. The high <br />concentrations of Cryptosporidium related to the water sprinkler might be related to the small <br />volume that could be collected directly from the sprinkler, or possibly some bird droppings directly in <br />the samples taken. (More sampling would be needed to verify.) <br />There were no detections of Legionella serogroup 1, which is the serogroup of most concern for <br />human health. The subtype of the avian influenza virus was not determined. However, the presence <br />of avian influenza virus is typical when water fowl are present on ponds. <br />The detection of rotavirus and human Bacteriodales indicates that traces of human sewage are in the <br />pond water. Again, this is not entirely unexpected, since stormwater runoff often passes over areas <br />or objects where human fecal material might exist, such as trash containing soiled diapers, outdoor <br />portable toilets, recreational vehicle dump stations, or other contaminated locations. In some cases, <br />leaking underground sewage pipes have also contributed to the presence of human sewage in <br />stormwater ponds or surface water. The source is not known in this case. <br />Recommendations <br />Given the results from this sampling, MDH would currently advise the City of Centerville to continue <br />the practice of irrigating with the stormwater in the overnight hours when few people are using the <br />park. The exposure of irrigated areas to sunlight in the morning hours, in addition to a longer time <br />period before the public uses the park, will allow potentially harmful organisms to subside or become <br />inactivated. If there are occasions when the source water pond is highly populated with water fowl, <br />or if a public health alert related to bird flu has been issued, refraining from irrigation with the system <br />until the water fowl population has moved away or decreased, or the public health alert has been <br />lifted, may be appropriate. <br />MDH is planning to continue to study questions related to water reuse and public health risks. If <br />additional research causes a change in MDH's recommendations stated above, we will contact the <br />City with our recommendations for operation of the irrigation system. <br />We wish to thank the City of Centerville for the assistance as we work to learn more about water <br />reuse systems in Minnesota. If you have questions or would like to discuss the results of the sampling <br />further, please contact us at 651-201-4923 or nancy.rice@state.mn.us. <br />Minnesota Department of Health <br />Environmental Surveillance and Assessment <br />PO Box 64975 <br />St. Paul, MN 55164-0975 <br />(651) 201-4899 <br />health.risk(@state.mn.us <br />www.health.state.mn.us <br />2/9/2017 <br />To obtain this information in a different format, call: 651-201-4923. Printed on recycled paper. <br />4 <br />103 <br />
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