SW Well 1A Water System Improvements The City of Yelm has historically relied on their two Downtown Wells for potable water supply. It is unlikely that these wells can provide enough capacity for future demands. Therefore, in anticipation of future growth, the City drilled the Southwest Well 1A in 2010, the first well in the Southwest Wellfield. The City plans on further developing and transferring water rights to this wellfield to provide reliable source that can keep up with growth. Water quality testing of the Southwest Well 1A showed levels of manganese above the secondary maximum contaminant level (SMCL) and the presence of ammonia. Since the existing Downtown Wells have low to no manganese, the City has chosen to include manganese treatment as part of the Southwest Well 1A water syst

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