Maryland Heights Water Hardness & Quality Report (2026)
Water Hardness
10 grains per gallon
Source
river
pH Level
8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
347.3 mg/L
Est. Daily Cost
$0.46
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 Maryland Heights, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Maryland Heights | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.9 yrs | 8.5 yrs | -54% |
| Washing Machine | 7.3 yrs | 12 yrs | -39% |
| Water Heater | 8.7 yrs | 15 yrs | -42% |
Regional Water Comparison
How Maryland Heights compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Maryland Heights, Missouri | 171.5 mg/L | 5.5 ppt | 🟠 Hard | river |
| Saint Ann, Missouri | 100 mg/L | 3.7 ppt | 🟡 Moderately Hard | river |
| Creve Coeur, Missouri | 251.5 mg/L | 7.6 ppt | 🔴 Very Hard | river |
| Overland, Missouri | 145.5 mg/L | 4.8 ppt | 🟠 Hard | river |
| Hazelwood, Missouri | 201.5 mg/L | 6.3 ppt | 🔴 Very Hard | river |
National Benchmark
How Maryland Heights compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Maryland Heights | 171.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Maryland Heights's Water Unique?
Local geology and source profile
Maryland Heights, Missouri, in St. Louis County — a major west St. Louis County suburban community (Maryland Heights is a significant St. Louis County city — a west St. Louis County suburb adjacent to Creve Coeur and Bridgeton; Maryland Heights is the home of Hollywood Casino Amphitheatre (one of the most important outdoor concert venues in the St. Louis metro and the Midwest — the amphitheatre, formerly known as Riverport Amphitheatre and UMB Bank Pavilion, is one of the most historically significant outdoor concert venues in the United States; it was the site of the infamous Guns N' Roses–St. Louis riot of 1991, one of the most destructive rock concert riots in American history), home of Centene Stadium (now CITY Park — the home of St. Louis City SC, the Major League Soccer expansion team that began play in 2023; the new downtown stadium reflects the St. Louis soccer tradition (St. Louis has one of the deepest soccer traditions of any American city — the St. Louis Steamers, the St. Louis Stars, and the deep youth soccer culture that produced many US national team players)), a diverse St. Louis County community with a primarily working-class and middle-class suburban population — draws its municipal water supply via the Missouri American Water. Water hardness in Maryland Heights measures 171.5 mg/L — classified as hard.
Maryland Heights's hard supply reflects the west St. Louis County Missouri River supply's calcareous character. The Missouri American Water distributes Missouri River supply to the west St. Louis County Maryland Heights zone with effective treatment, producing the hard 171.5 mg/L.
At 171.5 mg/L, Maryland Heights residents face regular hard water challenges. Monthly descaling and water softeners are 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 via the Missouri American Water — the St. Louis County Maryland Heights corridor (Ordovician calcareous Gasconade Dolomite and Mississippian calcareous Burlington Limestone — the calcareous west St. Louis County Ozark Plateau dolomite supply; effective treatment); hard supply at 171.5 mg/L in St. Louis County.