Webster Groves Water Hardness & Quality Report (2026)
Water Hardness
15 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
645.9 mg/L
Est. Daily Cost
$0.69
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 Webster Groves, your appliances are currently losing 34% efficiency due to mineral buildup.
| Appliance | In Webster Groves | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.1 yrs | 12 yrs | -66% |
| Water Heater | 5.3 yrs | 15 yrs | -65% |
Regional Water Comparison
How Webster Groves compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Webster Groves, Missouri | 257 mg/L | 7.7 ppt | 🔴 Very Hard | river |
| Affton, Missouri | 204 mg/L | 6.3 ppt | 🔴 Very Hard | river |
| Kirkwood, Missouri | 88.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | river |
| Clayton, Missouri | 140.5 mg/L | 4.7 ppt | 🟠 Hard | river |
| Concord, Missouri | 189 mg/L | 6 ppt | 🔴 Very Hard | river |
National Benchmark
How Webster Groves compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Webster Groves | 257 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Webster Groves's Water Unique?
Local geology and source profile
Webster Groves, Missouri, in Saint Louis County in the inner St. Louis metro west of the city — an historic suburban enclave known for its Victorian architecture, Eden Theological Seminary, and one of Missouri's oldest planned residential communities — receives its municipal water from Missouri American Water, which draws from the Missouri River and/or the Meramec River system via the St. Louis regional water supply infrastructure. Missouri American Water treats and distributes supply throughout the St. Louis metropolitan area, with the Missouri River dominant in the service zone.
The very hard 257 mg/L hardness and high TDS of 645.9 mg/L reflect the Missouri River's extraordinary cumulative mineral burden from its vast Great Plains watershed. The Missouri River — the longest river in North America — drains the entire Rocky Mountain and Great Plains system from Montana through North Dakota, South Dakota, Iowa, Nebraska, and Kansas, collecting dissolved minerals from Cretaceous Pierre Shale, Permian Red Beds and gypsum evaporites, Paleozoic carbonate platforms, and Quaternary calcareous loess throughout its 2,500-mile course. By the time the Missouri reaches the St. Louis area, it carries one of the highest dissolved mineral loads of any major North American river.
At 257 mg/L, Webster Groves residents face very hard water as a daily household reality in the St. Louis metro. Scale builds rapidly in kettles and coffee machines within weeks, dishwashers require water softener or rinse aid treatment, and bathroom surfaces develop calcium deposits needing regular acidic cleaning. Descaling appliances every four to six weeks is the practical schedule. A whole-house water softener is strongly recommended for Webster Groves homes. The PFAS level of 7.7 ppt warrants a certified drinking water filter — Missouri American Water's Missouri River source carries PFAS from the river's vast industrial and agricultural Midwest basin.
Geology & Source: Webster Groves in Saint Louis County draws from Missouri American Water treating Missouri River supply — the Missouri River drains the entire Great Plains carbonate, evaporite, and loessic terrain from Montana through Kansas — cumulative Permian and Cretaceous carbonate plain dissolution produces very hard water at 257 mg/L with high TDS of 646 mg/L in this St. Louis suburb.