Crestwood 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
622 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 Crestwood, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Crestwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.3 yrs | 12 yrs | -64% |
| Water Heater | 5.6 yrs | 15 yrs | -63% |
Regional Water Comparison
How Crestwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Crestwood, Missouri | 251 mg/L | 7.6 ppt | 🔴 Very Hard | river |
| Kirkwood, Missouri | 88.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | river |
| Concord, Missouri | 189 mg/L | 6 ppt | 🔴 Very Hard | river |
| Webster Groves, Missouri | 257 mg/L | 7.7 ppt | 🔴 Very Hard | river |
| Affton, Missouri | 204 mg/L | 6.3 ppt | 🔴 Very Hard | river |
National Benchmark
How Crestwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Crestwood | 251 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Crestwood's Water Unique?
Local geology and source profile
Crestwood, Missouri, in Saint Louis County — a Saint Louis County city adjacent to Kirkwood and Sunset Hills in the south St. Louis suburban ring — receives its water from Missouri American Water or Metropolitan St. Louis Sewer District, drawing from the Meramec River and supplemental Missouri River sources through the east-central Missouri distribution.
The very hard 251 mg/L hardness and high TDS of 622 mg/L reflect the Saint Louis County Meramec-Missouri supply's very hard dolomitic character — the Ordovician Gasconade Dolomite and Mississippian Burlington Limestone are both highly calcareous formations of the Ozark Dome region that dominate the Meramec watershed (compare Kirkwood MO: 248/615 in Saint Louis County comparable; Sunset Hills MO: 254/628 in Saint Louis County comparable; Crestwood consistent very hard from the same Saint Louis County Meramec Ordovician dolomitic supply). The Meramec watershed at Saint Louis County — Ordovician Gasconade Dolomite (highly dolomitic — primary hardness contributor), Mississippian Burlington Limestone (calcareous — secondary contributor), and Quaternary Meramec alluvium (calcareous — TDS contributor).
At 251 mg/L with TDS 622, Crestwood's water is very hard — a water softener is strongly recommended to protect appliances and plumbing. Quarterly descaling is appropriate. The PFAS level of 7.6 ppt warrants a certified drinking water filter. Review Missouri American Water's annual water quality report for the latest monitoring data.
Geology & Source: Crestwood in Saint Louis County draws from Missouri American Water on the Meramec River (Saint Louis County, east-central Missouri) — the Meramec watershed at Saint Louis County drains Ordovician Gasconade Dolomite (highly dolomitic) and Mississippian Burlington Limestone (calcareous) — Missouri Saint Louis County Meramec River Ordovician dolomitic supply produces very hard water at 251 mg/L with TDS 622 mg/L.