Old Jamestown Water Hardness & Quality Report (2026)
Water Hardness
8.2 grains per gallon
Source
river
pH Level
7.8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
259.6 mg/L
Est. Daily Cost
$0.37
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 Old Jamestown, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Old Jamestown | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5 yrs | 8.5 yrs | -41% |
| Washing Machine | 8.4 yrs | 12 yrs | -30% |
| Water Heater | 10 yrs | 15 yrs | -33% |
Regional Water Comparison
How Old Jamestown compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Old Jamestown, Missouri | 140.5 mg/L | 4.7 ppt | 🟠 Hard | river |
| Florissant, Missouri | 154 mg/L | 5.1 ppt | 🟠 Hard | river |
| Spanish Lake, Missouri | 118.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | river |
| Ferguson, Missouri | 120 mg/L | 4.2 ppt | 🟠 Hard | river |
| Hazelwood, Missouri | 201.5 mg/L | 6.3 ppt | 🔴 Very Hard | river |
National Benchmark
How Old Jamestown compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Old Jamestown | 140.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Old Jamestown's Water Unique?
Local geology and source profile
Old Jamestown, 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, drawing from the Missouri River through the St. Louis metropolitan water system serving north St. Louis County.
The moderately hard 140.5 mg/L hardness and TDS of 259.6 mg/L are essentially consistent with the Spanish Lake supply (118.5 mg/L) in the same north St. Louis County area — reflecting the Missouri River at St. Louis's mixed Great Plains and Ozark drainage character. The same Missouri American Water Missouri River supply serves both communities, with the moderate hardness from Great Plains calcareous loess-till drainage and Ozark Border carbonate tributaries (Gasconade and Osage rivers adding Mississippian limestone hardness).
At 140.5 mg/L, Old Jamestown'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 4.7 ppt warrants a certified drinking water filter — the Boeing St. Louis defense-aerospace corridor (Hazelwood, St. Louis County), the Bridgeton Landfill complex, and the north St. Louis County industrial PFAS legacy contribute to Old Jamestown's readings.
Geology & Source: Old Jamestown in Saint Louis County draws from Missouri American Water on the Missouri River (St. Louis metro system) — the Missouri River at St. Louis drains the Great Plains (calcareous Pleistocene loess and glacial till) and the Ozark Border (Mississippian Burlington-Keokuk limestone) — Missouri River Great Plains calcareous drainage produces moderately hard water at 140.5 mg/L with TDS 260 mg/L in this Saint Louis County Missouri community.