Table D Report
| The Metropolitan Water District of Southern California | ||||||||||||||
| General Mineral and Physical Analysis of Metropolitan's Water Supplies | ||||||||||||||
| Table D | ||||||||||||||
| October 2025 | ||||||||||||||
| SOURCE WATERS | TREATMENT PLANT EFFLUENTS | |||||||||||||
| CONSTITUENTS | UNITS | Lake Havasu | San Jacinto Tunnel | Lake Mathews | Castaic Lake | Silver-Wood Lake | Lake Perris | Diamond Valley Lake | Lake Skinner | Wey-Mouth | Diemer | Jensen | Skinner | Mills |
| SILICA | mg/L | 8.3 | 8.9 | 8.3 | 12.1 | 11.0 | 5.7 | 9.1 | 10.5 | 9.6 | 9.6 | 12.2 | 10.4 | 11.0 |
| CALCIUM | mg/L | 72 | 72 | 67 | 30 | 15 | 26 | 20 | 51 | 43 | 44 | 31 | 54 | 16 |
| MAGNESIUM | mg/L | 26 | 25 | 26 | 13 | 9 | 13 | 12 | 20 | 19 | 19 | 13 | 21 | 10 |
| SODIUM | mg/L | 93 | 93 | 97 | 42 | 33 | 53 | 49 | 72 | 78 | 78 | 50 | 83 | 45 |
| POTASSIUM | mg/L | 4.9 | 4.9 | 5.1 | 2.8 | 2.1 | 3.5 | 3.6 | 4.0 | 3.8 | 3.8 | 2.9 | 4.2 | 2.3 |
| ALKALINITY, CARBONATE AS CO3 | mg/L | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
| ALKALINITY, BICARBONATE AS HCO3 | mg/L | 162 | 161 | 148 | 112 | 82 | 121 | 93 | 133 | 116 | 113 | 122 | 132 | 76 |
| SULFATE | mg/L | 217 | 215 | 221 | 58 | 15 | 41 | 44 | 147 | 139 | 146 | 64 | 164 | 25 |
| CHLORIDE | mg/L | 98 | 98 | 101 | 48 | 46 | 70 | 63 | 79 | 86 | 84 | 52 | 87 | 59 |
| NITRATE | mg/L | 0.7 | 1.0 | 0.4 | 1.9 | 0.4 | <0.1 | <0.1 | 0.5 | 0.5 | 0.5 | 2.1 | 0.3 | 0.9 |
| FLUORIDE | mg/L | 0.3 | 0.3 | 0.3 | 0.2 | <0.1 | 0.1 | 0.1 | 0.2 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 |
| TOTAL DISSOLVED SOLIDS (TDS) | mg/L | 601 | 599 | 600 | 264 | 173 | 273 | 247 | 451 | 438 | 442 | 289 | 491 | 212 |
| TOTAL HARDNESS AS CaCO3 | mg/L | 291 | 289 | 279 | 134 | 77 | 121 | 101 | 214 | 189 | 191 | 137 | 228 | 82 |
| TOTAL ALKALINITY AS CaCO3 | mg/L | 133 | 132 | 121 | 92 | 67 | 99 | 76 | 109 | 95 | 93 | 100 | 108 | 68 |
| FREE CARBON DIOXIDE | mg/L | 1.6 | 1.4 | 1.1 | 7.3 | 1.2 | 1.4 | 0.8 | 2.0 | 1.0 | 0.9 | 0.8 | 1.5 | 0.3 |
| pH | pH | 8.24 | 8.27 | 8.36 | 7.41 | 8.04 | 8.16 | 8.28 | 8.05 | 8.30 | 8.33 | 8.38 | 8.17 | 8.69 |
| SPECIFIC CONDUCTANCE | μS/cm | 989 | 985 | 990 | 465 | 316 | 508 | 450 | 763 | 754 | 759 | 504 | 824 | 386 |
| COLOR | CU | 3 | 3 | 3 | 10 | 10 | 5 | 2 | 5 | 1 | 1 | 1 | 1 | 1 |
| TURBIDITY | NTU | 0.73 | 0.77 | 0.89 | 0.51 | 1.5 | 0.58 | 0.76 | 0.58 | 0.04 | 0.04 | 0.03 | 0.05 | 0.03 |
| TEMPERATURE | °C | 24 | 24 | 25 | 16 | 22 | 23 | 22 | 24 | 22 | 24 | 19 | 26 | 21 |
| BROMIDE | mg/L | 0.09 | 0.05 | 0.07 | 0.14 | 0.14 | 0.21 | 0.20 | 0.08 | -- | -- | -- | -- | -- |
| TOTAL ORGANIC CARBON | mg/L | 3.59 | 3.10 | 3.74 | 3.06 | 2.74 | 3.97 | 3.46 | 3.14 | -- | -- | -- | -- | -- |
| SATURATION INDEX | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0.51 | 0.57 | 0.43 | 0.57 | 0.36 |
| STATE PROJECT WATER | % | 0 | 0 | 0 | 100 | 100 | 100 | 100 | 40 | 50 | 44 | 100 | 33 | 100 |
