St. Peters, MO Water Report

Your St. Peters tap is a blend - part Missouri River water bought from St. Louis, part well water pumped out of the Mississippi floodplain and softened by the city. Even after that softening it still runs about 8-10 grains hard, so you're getting the chalky white scale crusting your faucets and shower glass, soap that won't lather, dry tight skin and dull flat hair, and minerals quietly baking onto your water heater element and cutting its life short. The high chloride and 482 ppm of dissolved solids add a flat mineral taste, and chlorine disinfection leaves behind TTHMs and HAA5 byproducts you can sometimes smell at the tap.

On a private well in St. Peters: St. Charles County river-bottom and rural wells (Portage Des Sioux, West Alton, Defiance/Augusta, Femme Osage/Weldon Spring) draw from the iron- and manganese-heavy Missouri/Mississippi alluvial aquifer: rusty staining and clogged fixtures, very hard water (often 15-25+ gpg untreated, estimated), rotten-egg sulfur/H2S smell from the reducing aquifer, nitrate from farm fertilizer/manure/septic (shallow wells can exceed 10 ppm, well-specific), coliform/E. coli bacteria in shallow and septic-dense areas, and naturally occurring radium/uranium in deeper aquifers - plus a documented uranium hotspot in alluvial groundwater near the former Weldon Spring chemical/ordnance site.