Denham Springs Water Hardness & Quality Report (2026)
Water Hardness
3.9 grains per gallon
Source
river
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
118.5 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 Denham Springs, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Denham Springs | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Denham Springs compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Denham Springs, Louisiana | 66.5 mg/L | 7.4 ppt | 🟡 Moderately Hard | river |
| Shenandoah, Louisiana | 136 mg/L | 12 ppt | 🟠 Hard | river |
| Central, Louisiana | 68 mg/L | 7.5 ppt | 🟡 Moderately Hard | river |
| Prairieville, Louisiana | 95 mg/L | 9.3 ppt | 🟡 Moderately Hard | river |
| Gardere, Louisiana | 115.5 mg/L | 10.6 ppt | 🟡 Moderately Hard | river |
National Benchmark
How Denham Springs compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Denham Springs | 66.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Denham Springs's Water Unique?
Local geology and source profile
Denham Springs, Louisiana, in Livingston Parish — a Livingston Parish city adjacent to Walker and Baton Rouge on the Amite River east of Baton Rouge — receives its water from the Livingston Parish Water District, drawing from the Amite River through the south-central Louisiana distribution.
The soft 66.5 mg/L hardness and TDS of 118.5 mg/L reflect the Livingston Parish supply's soft Gulf Coast lowland character — the Quaternary Holocene alluvium and Pleistocene Prairie Formation are slightly calcareous formations in the south-central Louisiana coastal plain; the Amite River at Livingston Parish draws from sandy coastal plain formations with minimal dissolved mineral content, producing relatively soft water compared to most of the Gulf South (compare Walker LA: 63/112 in Livingston Parish comparable; Baton Rouge LA: 69/125 in East Baton Rouge Parish comparable; Denham Springs consistent soft from the same Livingston Parish Amite River Quaternary supply). The Amite River supply — Quaternary Holocene alluvium (slightly calcareous — secondary contributor), Pleistocene Prairie Formation (slightly calcareous — primary hardness contributor), and Holocene Louisiana coastal plain deposit (slightly calcareous — TDS contributor).
At 66.5 mg/L with TDS 119, Denham Springs' water is soft — minimal scale buildup. Annual descaling as preventative maintenance is sufficient. The PFAS level of 7.4 ppt warrants a certified drinking water filter. Review the Livingston Parish Water District's annual water quality report.
Geology & Source: Denham Springs in Livingston Parish draws from the Livingston Parish Water on the Amite River supply (Livingston Parish, south-central Louisiana) — the south-central Louisiana Gulf Coast at Livingston Parish draws from Quaternary Holocene alluvium (slightly calcareous) and Pleistocene Prairie Formation (slightly calcareous) — Louisiana Livingston Parish Amite River Quaternary supply produces soft water at 66.5 mg/L with TDS 118.5 mg/L.