Water Quality Indicators
The Highlands Ranch Water Water Quality Lab collects and analyzes weekly samples of the finished treated water leaving the Joseph Blake Water Treatment Plant. The samples are analyzed for common water quality indicators. The data represented below are quarterly averages of the analytical results.
2025 Average
| 1st quarter | 2nd quarter | 3rd quarter | 4th quarter | |
|---|---|---|---|---|
| Total Alkalinity mg/l CaCO3 | 143 | 115 | 102 | 108 |
| Total Calcium mg/l CaCO3 | 62 | 191 | 134 | 152 |
| Total Chloride mg/l | 19 | 154 | 83 | 85 |
| Total Residual Chlorine | 2.1 | 2.8 | 2.8 | 2.3 |
| Total Hardness mg/l CaCO3 | 74 | 263 | 185 | 206 |
| pH Units | 8.06 | 8.2 | 8.18 | 7.96 |
| Total Dissolved Solids mg/l | 234 | 580 | 397 | 425 |
| Total Sulfate mg/l | 32 | 131 | 96 | 106 |
| Temperature Celsius | 15 | 17 | 22.3 | 17.5 |
| Total Magnesium mg/lCaCO3 | 11 | 72 | 51 | 54 |