Mehlville Water Hardness & Quality Report (2026)
Water Hardness
13 grains per gallon
Source
river
pH Level
8.4
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
513.7 mg/L
Est. Daily Cost
$0.59
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 Mehlville, your appliances are currently losing 30% efficiency due to mineral buildup.
| Appliance | In Mehlville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.3 yrs | 8.5 yrs | -73% |
| Washing Machine | 5.4 yrs | 12 yrs | -55% |
| Water Heater | 6.7 yrs | 15 yrs | -55% |
Regional Water Comparison
How Mehlville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mehlville, Missouri | 222 mg/L | 6.8 ppt | 🔴 Very Hard | river |
| Concord, Missouri | 189 mg/L | 6 ppt | 🔴 Very Hard | river |
| Oakville, Missouri | 100 mg/L | 3.7 ppt | 🟡 Moderately Hard | river |
| Affton, Missouri | 204 mg/L | 6.3 ppt | 🔴 Very Hard | river |
| Lemay, Missouri | 183.5 mg/L | 5.8 ppt | 🔴 Very Hard | river |
National Benchmark
How Mehlville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mehlville | 222 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mehlville's Water Unique?
Local geology and source profile
Mehlville, Missouri, in St. Louis County — a major south St. Louis County suburban community (Mehlville is a significant St. Louis County unincorporated community — a south St. Louis County suburb adjacent to Oakville and Fenton in the I-55 and I-270 south corridor; Mehlville is one of the classic south St. Louis County working-class and middle-class suburban communities that expanded significantly in the post-WWII era as St. Louis City residents migrated south and west into St. Louis County), home of Mehlville High School (one of the most significant St. Louis County public high schools), a diverse St. Louis County community with a primarily working-class to middle-class, German-American, Irish-American, and diverse suburban family population, adjacent to Concord and Oakville in the south St. Louis County corridor, home of a significant retail corridor along Lindbergh Boulevard and Telegraph Road, and a classic south St. Louis County bedroom suburban community — draws its municipal water supply via the Missouri American Water. Water hardness in Mehlville measures 222 mg/L — classified as very hard.
Mehlville's very hard supply reflects the south St. Louis County Ozark Plateau limestone karst's calcareous character. The Missouri American Water distributes Missouri River–Meramec River blended supply with limited softening to the south St. Louis County Mehlville zone, producing the very hard 222 mg/L.
At 222 mg/L, Mehlville residents face significant hard water challenges. Regular water softeners and descaling are strongly recommended. Missouri American Water consistently delivers water meeting all Missouri DNR and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Missouri River (Metropolitan St. Louis sewer and water district intake) via the Missouri American Water (St. Louis County) — the St. Louis County south St. Louis County suburban Mehlville corridor (Mississippian calcareous Burlington and Keokuk Limestones — the calcareous south St. Louis County Ozark Plateau limestone karst; limited softening); very hard supply at 222 mg/L in St. Louis County.