From time to time the Water Treatment Plant receives resident questions regarding the mineral content of our drinking water for the purposes of home brewing. Listed below are common analytes that are important to the homebrewer. Concentrations are based on actual laboratory results unless otherwise stated. If you need additional information, please call the Water Treatment Plant at 847.433.4355.
| Concentrations based on actual lab results unless otherwise stated | ||||
| Analyte | Units | 2021 | 2022 | 2023 |
| Total Alkalinity, as CaCO3 | ppm | 110 | 98 | 100 |
| Bicarbonate (calc. using Alkalinity and pH) | ppm | 133 | 119 | 121 |
| Calcium | ppm | 35 | 35 | 34 |
| Carbonate (calc. using Alkalinity and pH) | ppm | 0.5 | 0.4 | 0.4 |
| Chloride | ppm | 21 | 20 | 17 |
| Copper | ppb | 4.8 | - | - |
| Fluoride | ppm | 0.752 | 0.708 | 0.729 |
| Hardness, as CaCO3 | ppm | 140 | 140 | 130 |
| Hardness, as grains per gallon | gr/gal | 8.2 | 8.2 | 7.6 |
| Iron | ppb | <10 | <10 | <10 |
| Magnesium | ppm | 12 | 13 | 12 |
| Nitrate | ppm | 0.30 | 0.38 | 0.32 |
| Nitrite | ppm | 0.15 | - | - |
| pH | pH units | 7.9 | 7.9 | 7.9 |
| Potassium | ppm | - | - | - |
| Sodium | ppm | 12 | 13 | 11 |
| Sulfate | ppm | 23 | 23 | 23 |