Water Hardness in Colorado (CO)
Colorado has an average water hardness of 170 ppm (9.9 grains per gallon), which is classified as Moderately Hard . Water hardness at this level may cause noticeable scale buildup on fixtures and reduced soap lathering. Some Colorado households choose to install a water softener or conditioner for improved water quality, though it is not strictly necessary. Water hardness varies between cities — from 55 ppm in Boulder to 280 ppm in Grand Junction.
Water Hardness by City in Colorado
The table below shows water hardness data for 9 cities in Colorado, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Grand Junction | 280 ppm | 16.4 gpg | Very Hard | Surface | 8 | 450 | City of Grand Junction |
| Pueblo | 240 ppm | 14 gpg | Hard | Mixed | 7.9 | 380 | Pueblo Board of Water Works |
| Fort Collins | 200 ppm | 11.7 gpg | Hard | Mixed | 7.8 | 300 | Fort Collins Utilities |
| Loveland | 170 ppm | 9.9 gpg | Moderately Hard | Mixed | 7.6 | 265 | City of Loveland Water and Power |
| Durango | 130 ppm | 7.6 gpg | Moderately Hard | Surface | 7.5 | 200 | City of Durango Utilities |
| Aurora | 105 ppm | 6.1 gpg | Slightly Hard | Mixed | 7.5 | 155 | Aurora Water |
| Denver | 90 ppm | 5.3 gpg | Slightly Hard | Surface | 7.3 | 130 | Denver Water |
| Colorado Springs | 80 ppm | 4.7 gpg | Slightly Hard | Surface | 7.2 | 115 | Colorado Springs Utilities |
| Boulder | 55 ppm | 3.2 gpg | Soft | Surface | 7.1 | 82 | City of Boulder Utilities |
Understanding Water Hardness in Colorado
Water Sources in Colorado
The majority of cities in Colorado draw their water from surface sources such as rivers, lakes, and reservoirs. Surface water generally contains fewer dissolved minerals than groundwater, which helps explain the overall hardness profile of the state. Cities that rely on surface water tend to have softer water because the water has less contact time with mineral-bearing rock formations underground.
Hardness Variation Across Colorado
Water hardness in Colorado ranges from 55 ppm in Boulder to 280 ppm in Grand Junction — a difference of 225 ppm. This variation means that treatment recommendations differ significantly between cities. Residents of Grand Junction and other cities with hard water should seriously consider installing a water softener to protect their homes. At 280 ppm, the annual cost of hard water damage to appliances, plumbing, and increased cleaning product usage can easily exceed $12. Meanwhile, Boulder enjoys naturally soft water that needs no treatment at all — an advantage that saves residents money on both equipment and ongoing maintenance.
Recommended Treatment for Colorado Water
Based on the average water hardness of 170 ppm in Colorado, a water softener is not strictly necessary, but some homeowners may prefer treated water. The most effective treatment options for Colorado's water hardness level include:
- Salt-Based Water Softener ($800 - $2,500) — Removes hardness minerals. Highly effective.
- Salt-Free Water Conditioner ($1,000 - $3,000) — Conditions water without removing minerals. Moderately effective.
- Reverse Osmosis System ($200 - $500) — Removes hardness minerals. Highly effective.
- Electronic Descaler ($150 - $400) — Conditions water without removing minerals. Moderately effective.
How Colorado Compares to Other States
Below is a comparison of Colorado with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| Colorado (CO) | 170 ppm | Moderately Hard | 9 |
| Idaho (ID) | 170 ppm | Moderately Hard | 8 |
| Oklahoma (OK) | 170 ppm | Moderately Hard | 8 |
| Missouri (MO) | 160 ppm | Moderately Hard | 8 |
| Montana (MT) | 180 ppm | Moderately Hard | 8 |
| Ohio (OH) | 160 ppm | Moderately Hard | 9 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in Colorado, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.