Farmington Water Hardness & Quality Report (2026)
Water Hardness
6.5 grains per gallon
Source
river
pH Level
7.6
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
188.8 mg/L
Est. Daily Cost
$0.30
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Farmington, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Farmington | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.5 yrs | 12 yrs | -21% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Farmington compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Farmington, Missouri | 112 mg/L | 4 ppt | 🟡 Moderately Hard | river |
| Arnold, Missouri | 250.5 mg/L | 7.5 ppt | 🔴 Very Hard | river |
| Oakville, Missouri | 100 mg/L | 3.7 ppt | 🟡 Moderately Hard | river |
| Mehlville, Missouri | 222 mg/L | 6.8 ppt | 🔴 Very Hard | river |
| Concord, Missouri | 189 mg/L | 6 ppt | 🔴 Very Hard | river |
National Benchmark
How Farmington compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Farmington | 112 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Farmington's Water Unique?
Local geology and source profile
Farmington, Missouri, in Saint Francois County — the Saint Francois County seat adjacent to Park Hills and Flat River, in the eastern Ozark Highlands mining district south of St. Louis — receives its municipal water from the Farmington Water Division, drawing from the Flat River watershed (Saint Francois County) through the Farmington municipal reservoirs.
The moderately hard 112 mg/L hardness and TDS of 188.8 mg/L reflect the eastern Missouri Ozark Dome's carbonate character. The Flat River watershed drains the Ozark Dome — Ordovician Gasconade Dolomite (fine-crystalline dolomite — primary aquifer and stream bottom), Cambrian Eminence Dolomite (deep Cambrian carbonate platform), and Cambrian Roubidoux Formation (dolomite-chert). The Ozark dolomite and carbonite drainage is the classic source of the moderately hard water characteristic of the southeast Missouri Ozark foothills supply.
At 112 mg/L, Farmington's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 4.0 ppt warrants a certified drinking water filter — the Saint Francois County mining district legacy (lead-zinc mines — historic water quality impacts), the Fort Leonard Wood (Pulaski County — AFFF in the Gasconade-Meramec watershed), and the southeast Missouri PFAS background contribute to Farmington's readings.
Geology & Source: Farmington in Saint Francois County draws from the Farmington Water Division on Flat River watershed reservoirs (Saint Francois County) — the Flat River drains the Ozark Dome (Ordovician Gasconade Dolomite, Cambrian Eminence Dolomite) — Missouri Ozark Dome Ordovician-Cambrian dolomite carbonate drainage produces moderately hard water at 112 mg/L with TDS 188.8 mg/L in this Saint Francois County Missouri city.