Florissant Water Hardness & Quality Report (2026)
Water Hardness
9 grains per gallon
Source
river
pH Level
7.9
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
296.3 mg/L
Est. Daily Cost
$0.41
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 Florissant, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Florissant | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.5 yrs | 8.5 yrs | -47% |
| Washing Machine | 7.9 yrs | 12 yrs | -34% |
| Water Heater | 9.4 yrs | 15 yrs | -37% |
Regional Water Comparison
How Florissant compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Florissant, Missouri | 154 mg/L | 5.1 ppt | 🟠 Hard | river |
| Ferguson, Missouri | 120 mg/L | 4.2 ppt | 🟠 Hard | river |
| Hazelwood, Missouri | 201.5 mg/L | 6.3 ppt | 🔴 Very Hard | river |
| Old Jamestown, Missouri | 140.5 mg/L | 4.7 ppt | 🟠 Hard | river |
| Saint Ann, Missouri | 100 mg/L | 3.7 ppt | 🟡 Moderately Hard | river |
National Benchmark
How Florissant compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Florissant | 154 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Florissant's Water Unique?
Local geology and source profile
Florissant, Missouri, in north St. Louis County — a major St. Louis north suburban community, historically a French colonial settlement (one of the oldest European settlements in Missouri), home of St. Louis Community College–Florissant Valley and a significant African-American suburban population — draws its municipal water supply from the Missouri River via Missouri American Water Company St. Louis district, distributed to Florissant. Water hardness in Florissant measures 154 mg/L — classified as hard.
Florissant's hard supply reflects the Missouri River's calcareous St. Louis north county watershed. The Missouri River at St. Louis County carries calcareous water from the upper Missouri basin (Kansas–Nebraska calcareous loess and Cretaceous Pierre Shale), and the St. Louis area Missouri River supply contacts the Pennsylvanian–Mississippian calcareous cyclothemic limestone of the St. Louis area bluffs. Missouri American Water's treatment plant and the Florissant distribution infrastructure — a post-World War II north St. Louis County suburban system developed primarily in the 1950s–1970s — maintain the supply at the hard 154 mg/L in the Florissant distribution zone.
At 154 mg/L, Florissant residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. Missouri American Water Company consistently delivers water meeting all Missouri DHSS and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Missouri River via the Missouri American Water Company St. Louis district and the City of Florissant Water Division — the St. Louis County north Missouri River corridor draining the Pennsylvanian–Mississippian calcareous cyclothems and Missouri River calcareous alluvial terrace; moderately hard supply at 154 mg/L in St. Louis County.