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“Septic Systems and Steep Slopes (18)” by Soil Science licensed under [CC BY 2.0], via flickr.com (cropped)
“Porta Potty” By David Shankbone (Own work) [GFDL , [CC-BY-SA-3.0] or CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)], via Wikimedia Commons (cropped)