Denver Water Hardness & Quality Report (2026)
Water Hardness
4.4 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
110 mg/L
Est. Daily Cost
$0.20
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 Denver, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Denver | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.6 yrs | 15 yrs | -16% |
Regional Water Comparison
How Denver compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Denver, Colorado | 75 mg/L | 3.4 ppt | 🟡 Moderately Hard | reservoir |
| Commerce City, Colorado | 155 mg/L | 5.3 ppt | 🟠 Hard | reservoir |
| Englewood, Colorado | 81 mg/L | 3 ppt | 🟡 Moderately Hard | reservoir |
| Wheat Ridge, Colorado | 57.5 mg/L | 2.3 ppt | 🟢 Soft | reservoir |
| Sherrelwood, Colorado | 163 mg/L | 5.6 ppt | 🟠 Hard | reservoir |
National Benchmark
How Denver compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Denver | 75 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Denver's Water Unique?
Local geology and source profile
Denver's water is supplied by Denver Water — the oldest and largest water utility in Colorado — drawing from an extensive collection system in the Rocky Mountains west of the city. The primary sources include the South Platte River watershed, Blue River watershed feeding Dillon Reservoir (via the Roberts Tunnel beneath the Continental Divide), and several smaller mountain reservoirs including Cheesman Reservoir and Antero Reservoir in South Park. Denver Water's Marston Treatment Plant and Foothills Water Treatment Plant process the incoming mountain supply before distribution to Denver and many surrounding suburbs. The system's engineering — moving water across the Continental Divide — represents one of the most significant trans-mountain diversion projects in the American West.
Denver's moderately soft hardness of 75 mg/L reflects the granitic character of its Rocky Mountain source watersheds. The Front Range and Blue River headwaters are underlain predominantly by Precambrian Pikes Peak Granite, Idaho Springs Formation gneiss, and Boulder Creek Granodiorite — ancient crystalline rocks that are highly resistant to chemical weathering and dissolve very few calcium or magnesium ions into snowmelt runoff. The small mineral contribution that does occur comes from scattered Cretaceous Pierre Shale and carbonate intrusions at lower elevations, mildly elevating hardness above the pure granite baseline.
Denver's soft water makes daily life noticeably pleasant: soap and shampoo lather well, glassware emerges from dishwashers largely spot-free, and limescale buildup is minimal compared to Front Range cities drawing from limestone-heavy eastern-slope sources. Appliances enjoy excellent longevity. The slight softness means standard detergent doses work efficiently, and no water softener is needed for Denver households. A basic carbon filter or filtered pitcher effectively addresses any chlorine taste from treatment, which is the most common water quality comment from Denver residents.
Geology & Source: South Platte River and Blue River watershed over Precambrian granite — moderately soft Rocky Mountain snowmelt