Destrehan Water Hardness & Quality Report (2026)
Water Hardness
4 grains per gallon
Source
river
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
124.4 mg/L
Est. Daily Cost
$0.18
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 Destrehan, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Destrehan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Destrehan compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Destrehan, Louisiana | 69 mg/L | 7.5 ppt | 🟡 Moderately Hard | river |
| Luling, Louisiana | 56 mg/L | 6.7 ppt | 🟢 Soft | river |
| Kenner, Louisiana | 68 mg/L | 7.4 ppt | 🟡 Moderately Hard | river |
| River Ridge, Louisiana | 137 mg/L | 12.1 ppt | 🟠 Hard | river |
| Waggaman, Louisiana | 46 mg/L | 6 ppt | 🟢 Soft | river |
National Benchmark
How Destrehan compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Destrehan | 69 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Destrehan's Water Unique?
Local geology and source profile
Destrehan, Louisiana, in Saint Charles County — a Saint Charles Parish community adjacent to Norco and Luling on the Mississippi River in southeast Louisiana — receives its water from the St. Charles Parish Water system, drawing from the Mississippi River through the southeast Louisiana distribution.
The soft 69 mg/L hardness and low TDS of 124.4 mg/L reflect the Saint Charles Parish Mississippi River supply's soft character — the Mississippi River at Louisiana carries diluted Rocky Mountain and Great Plains runoff that averages quite soft, with Quaternary alluvial sediment contributing only minor calcareous content (compare Norco LA: 67/120 in Saint Charles Parish comparable; Luling LA: 71/128 in Saint Charles Parish comparable; Destrehan consistent soft from the same Saint Charles Parish Mississippi River alluvial supply). The Mississippi River at Saint Charles Parish — Quaternary alluvial sediment (slightly calcareous — primary hardness contributor), Rocky Mountain insoluble rock flour (insoluble — dilutant), and Holocene Louisiana alluvium (slightly calcareous — minor TDS).
At 69 mg/L with TDS 124, Destrehan's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 7.5 ppt is elevated — a certified drinking water filter is recommended — the Saint Charles Parish Louisiana Chemical Corridor (massive petrochemical complex along the Mississippi) contributes to Destrehan's elevated PFAS readings. Review St. Charles Parish Water's annual report.
Geology & Source: Destrehan in Saint Charles County draws from the St. Charles Parish Water on the Mississippi River (Saint Charles County, southeast Louisiana) — the Mississippi at Saint Charles County carries Quaternary alluvial sediment (slightly calcareous) and Rocky Mountain insoluble rock flour — Louisiana Saint Charles County Mississippi River alluvial supply produces soft water at 69 mg/L with TDS 124.4 mg/L.