Creve Coeur Water Hardness & Quality Report (2026)
Water Hardness
14.7 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
623.7 mg/L
Est. Daily Cost
$0.67
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 Creve Coeur, your appliances are currently losing 34% efficiency due to mineral buildup.
| Appliance | In Creve Coeur | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.3 yrs | 12 yrs | -64% |
| Water Heater | 5.5 yrs | 15 yrs | -63% |
Regional Water Comparison
How Creve Coeur compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Creve Coeur, Missouri | 251.5 mg/L | 7.6 ppt | 🔴 Very Hard | river |
| Maryland Heights, Missouri | 171.5 mg/L | 5.5 ppt | 🟠 Hard | river |
| Overland, Missouri | 145.5 mg/L | 4.8 ppt | 🟠 Hard | river |
| Saint Ann, Missouri | 100 mg/L | 3.7 ppt | 🟡 Moderately Hard | river |
| Kirkwood, Missouri | 88.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | river |
National Benchmark
How Creve Coeur compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Creve Coeur | 251.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Creve Coeur's Water Unique?
Local geology and source profile
Creve Coeur, Missouri, in Saint Louis County — an affluent Saint Louis County city adjacent to Chesterfield and Ladue, in the west Saint Louis County corridor — receives its municipal water from Missouri American Water (MOAW), drawing from the Missouri River at the MOAW Missouri River treatment plant in the St. Louis metro area.
The very hard 251.5 mg/L hardness and high TDS of 623.7 mg/L are among the highest for the Saint Louis region — significantly harder than the St. Louis city Mississippi River supply (typically 170-220 mg/L). The Missouri River at St. Louis carries a heavy Great Plains-Rocky Mountain carbonate load: Cretaceous Pierre Shale (calcareous marine shale — vast drainage), calcareous Pleistocene loess (bluffs throughout the Missouri valley), and the Permian-Triassic evaporite dissolution from the Great Plains interior. The Missouri River supply is consistently harder and higher-TDS than the Mississippi River supply.
At 251.5 mg/L with TDS 623, Creve Coeur's water is very hard. A water softener is strongly recommended. Scale builds rapidly in all appliances and plumbing systems. The PFAS level of 7.6 ppt warrants a certified drinking water filter — the Lambert-St. Louis International Airport (AFFF — Missouri River watershed), the St. Louis industrial corridor, and the Missouri River PFAS background contribute to Creve Coeur's readings.
Geology & Source: Creve Coeur in Saint Louis County draws from Missouri American Water on the Missouri River (Saint Louis County) — the Missouri drains the Great Plains and Rocky Mountains (Cretaceous Pierre Shale, calcareous Pleistocene loess) — Missouri River Rocky Mountain-Great Plains calcareous drainage produces very hard water at 251.5 mg/L with high TDS 623.7 mg/L in this Saint Louis County Missouri city.