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Septic Systems, Lake Health and Drinking Water Safety Lake Networking Group: Septic Savvy, May 26, 2018 Holly Evans, Watershed Planning Coordinator CATARAQUI REGION CONSERVATION AUTHORITY One Water Drink Flush Swim Live 2


  1. Septic Systems, Lake Health and Drinking Water Safety Lake Networking Group: Septic Savvy, May 26, 2018 Holly Evans, Watershed Planning Coordinator CATARAQUI REGION CONSERVATION AUTHORITY

  2. One Water • Drink • Flush • Swim • Live 2 CATARAQUI REGION CONSERVATION AUTHORITY Thurston County, 2018

  3. Septic System Effluent 3 CATARAQUI REGION CONSERVATION AUTHORITY

  4. Drinking Water Impacts • Pathogens • Nitrogen • Chemicals • Micropollutants (pharmaceuticals and endocrine-active compounds) 3 CATARAQUI REGION CONSERVATION AUTHORITY

  5. Nearshore Impacts • Algae • Pathogens • Increased biological oxygen demand • Reduced biodiversity / food web disturbance EPA, 2017 3 CATARAQUI REGION CONSERVATION AUTHORITY

  6. Lake-wide Impacts • Eutrophication • Algae blooms • Hypoxia • Reduced biodiversity / food web disturbance 3 CATARAQUI REGION CONSERVATION AUTHORITY

  7. ✓ X NATURAL ALTERED 3 CATARAQUI REGION CONSERVATION AUTHORITY

  8. Thank you Holly Evans Coordinator, Watershed Planning hevans@crca.ca References: Mallin, M.A., McIver, M.R., Pollutant impacts to Cape Hatteras National Seashore from urban runoff and septic leachate; Marine Pollution Bulletin 64 (2012) pages 1356 -1366 Phillips, P.J., Schubert, C., Argue, D., Fisher, I., Furlong, E.T., Foreman, W., Gray, J., Chalmers, A. Concentrations of hormones, pharmaceuticals and other micropollutants in groundwater affected by septic systems in New England and New York; Science of the Total Environment 512-513 (2015) pages 43 - 54 Rosenberger, E., Hampton, S.E., Fradkin, S.C., Kennedy, B.P.Effects of shoreline development on the nearshore environment in large deep oligotrophic lakes; Freshwater Biology 53 (2008) pages 1673 -1691 Saby, M., Larocque, M., Pinti, D.L., Barbecot, F., Gagne, S., Barnetche, D., Cabada, H., Regional assessment of concentrations and sources of pharmaceutically active compounds, pesticides, nitrate, and E. coli in post-glacial aquifer environments (Canada); Science of the Total Environment 579 (2017) pages 557- 568 Sondergaarderik, M., Jeppesen, E., Anthropogenic impacts on lake and stream ecosystems, and approaches to restoration Journal of Applied Ecology 44 (2007) Volume pages 1089 -1094 23 CATARAQUI REGION CONSERVATION AUTHORITY

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