Webster Groves Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
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
$0.40
energy & soap waste
Source: See methodology section below · 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 20% efficiency due to mineral buildup.
| Appliance | In Webster Groves | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Webster Groves compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Webster Groves, Missouri | ≈ 120–179 mg/L | 7.7 ppt | 🟠 Hard | river |
| Crestwood, Missouri | ≈ 120–179 mg/L | 7.6 ppt | 🟠 Hard | river |
| Affton, Missouri | 67 mg/L | 6.3 ppt | 🟡 Moderately Hard | river |
| Kirkwood, Missouri | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Clayton, Missouri | ≈ 180+ mg/L | 4.7 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Webster Groves compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Webster Groves | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
Bring Scarsdale-quality water to your Webster Groves home
Shop water softeners on Amazon.com →
What Makes Webster Groves's Water Unique?
Local geology and source profile
Webster Groves, Missouri is served by American Water (Missouri American Water Company), which operates the St. Louis region water system. The utility draws from both the Missouri River and groundwater aquifers in the St. Louis metropolitan area. Treatment facilities in the region process surface water from the Missouri River alongside groundwater from local aquifers, serving Webster Groves and surrounding communities across St. Louis County. American Water publishes an annual Consumer Confidence Report covering water quality data, compliance records, and treatment details for the St. Louis service area.
The water supply is drawn from the Missouri River watershed and underlying Ordovician and Cambrian carbonate aquifers. The region's geology is dominated by dolomite and limestone formations — particularly the Plattin Limestone and Joachim Dolomite — which are highly soluble in water. As precipitation and surface water percolate through these carbonate-rich rock layers, they dissolve calcium and magnesium minerals, creating a hard water supply characteristic of the St. Louis region.
Webster Groves water is classified as hard, meaning scale buildup in pipes, water heaters, and appliances is a common concern for residents. Dishwashers and washing machines may show reduced efficiency, and soap scum on fixtures is expected. A water softener is recommended for households seeking to reduce mineral deposits and improve appliance longevity. Regular descaling of water heaters and faucet aerators is advisable even without softening treatment. According to American Water's 2025 Consumer Confidence Report for the St. Louis region, the system meets all state and federal standards; fluoride is maintained at 0.7 ppm for dental health, and the utility has maintained a zero-violation compliance record since 2023.
Geology & Source: Missouri River watershed, St. Louis County — Ordovician Plattin Limestone and Cambrian Joachim Dolomite; carbonate dissolution releases calcium and magnesium; produces hard water typical of the St. Louis region
Other Missouri Water Reports
Report an Issue
Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.
All reports are reviewed by our team. Thank you for supporting data quality!
Frequently Asked Questions
Is Webster Groves's water safe to drink?
Do I need a water softener in Webster Groves?
How does Webster Groves compare to the USA average?
Data Sources & Methodology
Water quality data for Webster Groves is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.