Warrenton Water Report

Warrenton, MO Water Report

Warren County · Grade F · Extremely hard · 16.0 grains per gallon

16.0Grains (gpg)

Grade F  Extremely hard

Anything over 7 gpg is considered hard. Warrenton runs extremely hard.

Source typeMixed
Est. annual cost$1150/yr
Your testFree, in-home

Warrenton runs on 100% deep groundwater and the City does NOT soften it - so your tap pours out very hard 16-grain water that crusts white scale on faucets and showerheads, kills soap lather, leaves spots on dishes, makes laundry stiff, and quietly shortens the life of your water heater and appliances. That same hardness leaves skin dry and itchy and hair flat and filmy. On top of it, the water is chlorinated, which creates cancer-linked disinfection byproducts (TTHMs run 116x the EWG health guideline), and it carries naturally-occurring radium from the rock under Warren County at roughly 41x the EWG guideline. It is legal and meets federal standards - but legal does not mean it matches the latest health science, and it definitely does not feel good on your body or your plumbing.

Very hard water (~16 gpg, 274 ppm) - city does NOT soften
Chlorine disinfection byproducts: TTHMs 17.4 ppb (116x EWG health guideline), HAA5
Naturally-occurring radium-226/228 ~2.06-2.9 pCi/L (~41x EWG guideline)
TDS 502 mg/L - slightly over EPA secondary limit of 500

On a private well in Warrenton: Private wells are unregulated (no CCR, no mandated testing) so owners have no idea what's in their water. Regional pattern, test to confirm any specific home: very hard water (15-25+ gpg on limestone/dolomite), iron and manganese causing orange/brown staining and metallic taste, hydrogen sulfide "rotten-egg" sulfur smell in deeper carbonate/sandstone wells, naturally elevated radium/gross alpha in deep wells (can exceed the 5 pCi/L MCL with nobody watching), nitrates from ag/septic in shallow row-crop and river-bottom wells, coliform/E. coli bacteria in shallow or flood-prone Missouri River bottom wells, and salty/brackish TDS in deep bottom wells near the freshwater-saline transition zone running through the county.

Data: verified municipal + lab reports for Warrenton, compiled 2026. (confidence: verified)

Questions Warrenton homeowners ask

Straight answers

How hard is Warrenton's water?+
Warrenton tests at 16.0 grains per gallon (gpg) - graded F, or "Extremely hard." Very hard water (~16 gpg, 274 ppm) - city does NOT soften
What else is in Warrenton's water besides hardness?+
"116x the health guideline for cancer-linked disinfection byproducts, plus naturally-occurring radium at ~41x - and the City's own deep wells confirm it." It's defensible (straight from the 2025 CCR + EWG), it's scary enough to act on, and it lands on both city customers and untested well owners. Pair the fear hook with the universal, non-scary hardness pitch (16-grain very hard water) to close.
What about private wells in Warrenton?+
Private wells are unregulated (no CCR, no mandated testing) so owners have no idea what's in their water. Regional pattern, test to confirm any specific home: very hard water (15-25+ gpg on limestone/dolomite), iron and manganese causing orange/brown staining and metallic taste, hydrogen sulfide "rotten-egg" sulfur smell in deeper carbonate/sandstone wells, naturally elevated radium/gross alpha in deep wells (can exceed the 5 pCi/L MCL with nobody watching), nitrates from ag/septic in shallow row-crop and river-bottom wells, coliform/E. coli bacteria in shallow or flood-prone Missouri River bottom wells, and salty/brackish TDS in deep bottom wells near the freshwater-saline transition zone running through the county.
What does hard water cost Warrenton homeowners a year?+
An estimated $1150 a year in scale damage, extra energy use, and shortened appliance life. See the full Warrenton cost breakdown at /cost.

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