Spanish Lake Water Hardness & Quality Report (2026)
Water Hardness
6.9 grains per gallon
Source
river
pH Level
7.7
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
204.1 mg/L
Est. Daily Cost
$0.32
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 Spanish Lake, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Spanish Lake | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 9.2 yrs | 12 yrs | -23% |
| Water Heater | 10.9 yrs | 15 yrs | -27% |
Regional Water Comparison
How Spanish Lake compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Spanish Lake, Missouri | 118.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | river |
| Jennings, Missouri | 193 mg/L | 6.1 ppt | 🔴 Very Hard | river |
| Old Jamestown, Missouri | 140.5 mg/L | 4.7 ppt | 🟠 Hard | river |
| Ferguson, Missouri | 120 mg/L | 4.2 ppt | 🟠 Hard | river |
| Florissant, Missouri | 154 mg/L | 5.1 ppt | 🟠 Hard | river |
National Benchmark
How Spanish Lake compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Spanish Lake | 118.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Spanish Lake's Water Unique?
Local geology and source profile
Spanish Lake, Missouri, in Saint Louis County — an unincorporated Saint Louis County community in the north St. Louis County corridor adjacent to Florissant and Ferguson, part of the north St. Louis County suburban belt — receives its municipal water from Missouri American Water, which draws from the Missouri River or the Meramec River through the St. Louis metropolitan water treatment system, serving the north St. Louis County communities.
The moderately hard 118.5 mg/L hardness and TDS of 204.1 mg/L reflect the Missouri River at St. Louis's mixed drainage character. The Missouri River at St. Louis drains the Great Plains (calcareous Pleistocene loess and glacial till from the Dakotas through Nebraska-Iowa), the Kansas-Nebraska carbonate platform, and the Ozark Border (Mississippian Burlington-Keokuk Limestone flowing from the Gasconade-Osage tributaries). Missouri American Water's St. Louis metropolitan treatment produces moderately hard water — softer than the deep Ozark aquifer supplies (Rolla: 269.5 mg/L) but harder than the pure upstream Missouri River (before carbonate tributary mixing).
At 118.5 mg/L, Spanish Lake's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 4.2 ppt warrants a certified drinking water filter — the Hazelwood defense-aerospace corridor (Boeing St. Louis, McDonnell-Douglas heritage), the St. Louis chemical manufacturing belt, and the north St. Louis County industrial PFAS legacy contribute to Spanish Lake's PFAS readings.
Geology & Source: Spanish Lake in Saint Louis County draws from the Missouri American Water treating the Missouri River or Meramec River — the Missouri River at St. Louis drains the Great Plains (calcareous glacial till and loess) and the Ozark Border (Mississippian Burlington-Keokuk limestone) — Missouri River mixed Great Plains and Ozark carbonate drainage produces moderately hard water at 118.5 mg/L with TDS 204 mg/L in this Saint Louis County Missouri community.