Chesterfield Water Hardness & Quality Report (2026)
Water Hardness
6.3 grains per gallon
Source
river
pH Level
7.6
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
178.4 mg/L
Est. Daily Cost
$0.29
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 Chesterfield, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Chesterfield | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.1 yrs | 8.5 yrs | -28% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.3 yrs | 15 yrs | -25% |
Regional Water Comparison
How Chesterfield compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Chesterfield, Missouri | 107.5 mg/L | 3.9 ppt | 🟡 Moderately Hard | river |
| Ballwin, Missouri | 87.5 mg/L | 3.3 ppt | 🟡 Moderately Hard | river |
| Manchester, Missouri | 137 mg/L | 4.6 ppt | 🟠 Hard | river |
| Wildwood, Missouri | 118.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | river |
| Saint Peters, Missouri | 137 mg/L | 4.6 ppt | 🟠 Hard | river |
National Benchmark
How Chesterfield compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chesterfield | 107.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Chesterfield's Water Unique?
Local geology and source profile
Chesterfield, Missouri, in west St. Louis County on the Missouri River floodplain and bluffs — one of the most affluent communities in Missouri, a major St. Louis western suburban community known for its upscale Chesterfield Village and Chesterfield Mall, the Chesterfield Amphitheater, and a major corporate headquarters corridor (Express Scripts, Mastercard's Global Technology and Operations center) — draws its municipal water supply from the Missouri River via Missouri American Water Company St. Louis district, distributed to Chesterfield. Water hardness in Chesterfield measures 107.5 mg/L — classified as moderately hard.
Chesterfield's moderate hardness — softer than Florissant (154 mg/L) on the same Missouri American Water system — reflects the west St. Louis County distribution characteristics in the Chesterfield zone. Chesterfield developed primarily in the 1970s–1990s as one of St. Louis County's last large suburban buildout areas, with relatively modern distribution infrastructure compared to the older north and south St. Louis County suburban zones. Missouri American Water's treatment plant supplies the entire St. Louis County distribution, but the Chesterfield zone's newer mains accumulate less mineral content, producing the moderate 107.5 mg/L — among the softer Missouri American Water zones in St. Louis County.
With hardness at 107.5 mg/L, Chesterfield residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Missouri American Water Company consistently delivers water meeting all Missouri DHSS and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Missouri River via the Missouri American Water Company St. Louis district and the City of Chesterfield Water Division — the St. Louis County west Missouri River corridor (Pennsylvanian–Mississippian calcareous cyclothemic limestone Missouri Bluffs); moderately hard supply at 107.5 mg/L in St. Louis County.