Jennings Water Hardness & Quality Report (2026)
Water Hardness
11.3 grains per gallon
Source
river
pH Level
8.2
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
414.6 mg/L
Est. Daily Cost
$0.51
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 Jennings, your appliances are currently losing 26% efficiency due to mineral buildup.
| Appliance | In Jennings | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.2 yrs | 8.5 yrs | -62% |
| Washing Machine | 6.5 yrs | 12 yrs | -46% |
| Water Heater | 7.9 yrs | 15 yrs | -47% |
Regional Water Comparison
How Jennings compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Jennings, Missouri | 193 mg/L | 6.1 ppt | 🔴 Very Hard | river |
| Ferguson, Missouri | 120 mg/L | 4.2 ppt | 🟠 Hard | river |
| University City, Missouri | 161.5 mg/L | 5.3 ppt | 🟠 Hard | river |
| Spanish Lake, Missouri | 118.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | river |
| Florissant, Missouri | 154 mg/L | 5.1 ppt | 🟠 Hard | river |
National Benchmark
How Jennings compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Jennings | 193 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Jennings's Water Unique?
Local geology and source profile
Jennings, Missouri, in Saint Louis County — a Saint Louis County city adjacent to Bellefontaine Neighbors and Ferguson in the north St. Louis metro — receives its water from Missouri American Water, drawing from the Missouri River or local sources (Saint Louis County) through the St. Louis metro distribution.
The very hard 193 mg/L hardness and TDS of 414.6 mg/L reflect the east Missouri Missouri River supply's hard Ozark Plateau calcareous character — consistent with other St. Louis metro Missouri American Water communities (Florissant: ~190 mg/L; Ferguson: ~195 mg/L). The Missouri River at St. Louis receives drainage from the Ozark Plateau — Ordovician Gasconade Dolomite (dolomite — primary hardness contributor), Mississippian Ste. Genevieve Limestone (calcareous — secondary contributor), and the central Missouri calcareous watershed. The Ordovician-Mississippian Ozark carbonate dissolution produces the very hard St. Louis metro supply.
At 193 mg/L, Jennings' water is very hard. A water softener is strongly recommended. Scale builds rapidly on all surfaces, appliance lifespans are significantly shortened, and water heaters require annual descaling without softening. The PFAS level of 6.1 ppt warrants a certified drinking water filter — the Saint Louis County north St. Louis metro industrial corridor and the Missouri River PFAS background from the St. Louis aerospace-defense complex contribute to Jennings' readings.
Geology & Source: Jennings in Saint Louis County draws from the Missouri American Water on the Missouri River or Meramec River (Saint Louis County, east Missouri) — the Missouri River at St. Louis drains Ordovician Gasconade Dolomite and Mississippian Ste. Genevieve Limestone (calcareous-dolomitic) — Missouri Saint Louis County Missouri River Ozark calcareous watershed produces very hard water at 193 mg/L with TDS 414.6 mg/L.