Water Quality in Colorado
Water hardness and contaminant data for 11 cities across Colorado. Find your city below to see a detailed water quality profile.
11
Cities
88
Avg Hardness (PPM)
152
Hardest City (PPM)
Colorado Cities by Water Hardness
| City | Hardness (PPM) | Level | PFAS (ppt) | Source |
|---|---|---|---|---|
| Greeley | 152 | Hard | 3 | Cache la Poudre River, local wells |
| Fort Collins | 105 | Moderately Hard | 4 | Cache la Poudre River, Horsetooth Reserv… |
| Colorado Springs | 101 | Moderately Hard | 4 | Mountain watersheds, groundwater |
| Denver | 90 | Moderately Hard | 4 | South Platte River + reservoirs |
| Arvada | 81 | Moderately Hard | 2 | Ralston Reservoir, Clear Creek |
| Thornton | 78 | Moderately Hard | 4 | Thornton reservoirs, Standley Lake |
| Boulder | 77 | Moderately Hard | 3 | North Boulder Creek, Barker Reservoir |
| Aurora | 73 | Moderately Hard | 2 | South Platte, Arkansas, Homestake |
| Lakewood | 73 | Moderately Hard | 4 | Denver Water system |
| Pueblo | 72 | Moderately Hard | 4 | Arkansas River, Pueblo Reservoir |
| Westminster | 66 | Moderately Hard | 2 | Standley Lake, Clear Creek |