The Centennial 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.

2023 Average

	1st quarter	2nd quarter	3rd quarter	4th quarter
Total Alkalinity mg/l CaCO3	141	116	103	126
Total Calcium mg/l CaCO3	63	194	158	118
Total Chloride mg/l	23	183	122	77
Total Residual Chlorine	2.3	2.5	2.6	2.2
Total Hardness mg/l CaCO3	74	273	217	157
pH Units	8.03	8.12	8.15	8
Total Dissolved Solids mg/l	244	632	480	366
Total Sulfate mg/l	31	150	120	79
Temperature Celsius	14.3	15.8	22.1	18.5
Total Magnesium mg/l	11	78	59	38