Kirkwood Water Hardness & Quality Report (2026)
Water Hardness
5.2 grains per gallon
Source
river
pH Level
7.5
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
137.2 mg/L
Est. Daily Cost
$0.24
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 Kirkwood, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Kirkwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12.1 yrs | 15 yrs | -19% |
Regional Water Comparison
How Kirkwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kirkwood, Missouri | 88.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | river |
| Webster Groves, Missouri | 257 mg/L | 7.7 ppt | 🔴 Very Hard | river |
| Concord, Missouri | 189 mg/L | 6 ppt | 🔴 Very Hard | river |
| Creve Coeur, Missouri | 251.5 mg/L | 7.6 ppt | 🔴 Very Hard | river |
| Affton, Missouri | 204 mg/L | 6.3 ppt | 🔴 Very Hard | river |
National Benchmark
How Kirkwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kirkwood | 88.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Kirkwood home
Shop water softeners on Amazon.com →
What Makes Kirkwood's Water Unique?
Local geology and source profile
Kirkwood, Missouri, in St. Louis County — a major west St. Louis County suburban community (Kirkwood is a significant St. Louis County city — one of the most historically distinguished west St. Louis County suburbs; Kirkwood was the first planned community west of the Mississippi River served by a railroad (the Pacific Railroad — now Missouri Pacific — began service to Kirkwood in 1853, establishing Kirkwood as one of the first American railroad suburbs); Kirkwood has one of the most beautiful historic downtown areas in the St. Louis metro — the Kirkwood Train Depot and the pedestrian-friendly commercial downtown along Argonne Drive are among the most charming suburban commercial streetscapes in the Midwest), home of Kirkwood Park (one of the most significant St. Louis County municipal parks), a diverse St. Louis County community with a primarily upper-middle-class, professional, and diverse suburban family population, adjacent to Webster Groves and Glendale in the west St. Louis County corridor — draws its municipal water supply via the Missouri American Water Company. Water hardness in Kirkwood measures 88.5 mg/L — classified as moderately soft.
Kirkwood's moderate softness reflects the west St. Louis County Ozark Plateau supply with effective treatment. The Missouri American Water distributes Missouri–Meramec River blended supply to the west St. Louis County Kirkwood zone with effective treatment, producing the moderately soft 88.5 mg/L.
With hardness at 88.5 mg/L, Kirkwood residents enjoy moderately soft water. Missouri American Water consistently delivers water meeting all Missouri DNR and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Missouri and Meramec Rivers via the Missouri American Water — the St. Louis County Kirkwood corridor (Ordovician calcareous Gasconade Dolomite and Mississippian calcareous Burlington Limestone — the calcareous west St. Louis County Ozark Plateau karst; effective treatment); moderately soft supply at 88.5 mg/L in St. Louis County.