Louisville Water Hardness & Quality Report (2026)
Water Hardness
6.1 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
214.7 mg/L
Est. Daily Cost
$0.28
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 Louisville, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Louisville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.2 yrs | 8.5 yrs | -27% |
| Washing Machine | 9.7 yrs | 12 yrs | -19% |
| Water Heater | 11.4 yrs | 15 yrs | -24% |
Regional Water Comparison
How Louisville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Louisville, Colorado | 104.5 mg/L | 3.8 ppt | 🟡 Moderately Hard | reservoir |
| Superior, Colorado | 149 mg/L | 5.2 ppt | 🟠 Hard | reservoir |
| Lafayette, Colorado | 142 mg/L | 4.9 ppt | 🟠 Hard | reservoir |
| Broomfield, Colorado | 149 mg/L | 5.2 ppt | 🟠 Hard | reservoir |
| Erie, Colorado | 116.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Louisville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Louisville | 104.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Louisville's Water Unique?
Local geology and source profile
Louisville, Colorado, in Boulder County — a growing Boulder County city at the base of the Front Range, adjacent to Lafayette and Broomfield in the Boulder-Denver northern tech corridor, home of the Rocky Flats National Wildlife Refuge (the former Rocky Flats nuclear weapons plant site) and the Louisville entertainment district — receives its municipal water from the Louisville Water Utility, which draws from the South Boulder Creek watershed through the Boulder Reservoir system (operated by the City of Boulder) or from the Northern Colorado Water Conservancy District (NCWCD) Colorado-Big Thompson Project (transbasin diversion from the Colorado River) through the Louisville service area.
The moderately soft 104.5 mg/L hardness and TDS of 214.7 mg/L reflect the South Boulder Creek watershed's mixed Front Range geology and Colorado transbasin diversion character. South Boulder Creek drains the Front Range — terrain underlain by Precambrian gneiss and schist of the Boulder Creek Metamorphic Complex (very soft crystalline terrain) and the overlying Cretaceous Pierre Shale (calcareous marine shale). The Colorado-Big Thompson Project water from the western slope Colorado River (moderately hard mountain water) blends with the eastern slope South Boulder Creek supply. The moderately soft result (104.5 mg/L) reflects the predominance of crystalline Front Range recharge.
At 104.5 mg/L, Louisville's water is moderately soft — comfortable for household use. Scale forms slowly over months, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 3.8 ppt is moderate for the Front Range — the former Rocky Flats Plant (US Department of Energy plutonium trigger manufacturing — significant industrial chemical legacy directly adjacent to Louisville), and the Boulder County tech-industrial corridor contribute to the Front Range PFAS background.
Geology & Source: Louisville in Boulder County draws from the Louisville Water Utility on South Boulder Creek (Boulder Reservoir) blended with NCWCD Colorado-Big Thompson Project water — the South Boulder Creek drains the Front Range (Precambrian Boulder Creek gneiss and Cretaceous Pierre Shale) — Front Range crystalline and Cretaceous calcareous drainage produces moderately soft water at 104.5 mg/L with TDS 215 mg/L in this Boulder County Colorado city.