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Red is bad, green is good, blue is not statistically different/neutral.

Compared to Distribution

an indicator guage with the arrow in the green the value is in the best half of communities.

an indicator guage with the arrow in the yellow the value is in the 2nd worst quarter of communities.

an indicator guage with the arrow in the red the value is in the worst quarter of communities.

Compared to Target

green circle with white tick inside it meets target; red circle with white cross inside it does not meet target.

Compared to a Single Value

green diamond with downward arrow inside it lower than the comparison value; red diamond with downward arrow inside it higher than the comparison value; blue diamond with downward arrow inside it not statistically different from comparison value.

Trend

green square outline with upward trending arrow inside it green square outline with downward trending arrow inside it non-significant change over time; green square with upward trending arrow inside it green square with downward trending arrow inside it significant change over time; blue square with equals sign no change over time.

Compared to Prior Value

green triangle with upward trending arrow inside it higher than the previous measurement period; green triangle with downward trending arrow inside it lower than the previous measurement period; blue equals sign no statistically different change from previous measurement period.

green chart bars Significantly better than the overall value

red chart bars Significantly worse than the overall value

light blue chart bars No significant difference with the overall value

gray chart bars No data on significance available

Chloride levels in Surface Water – Yahara Lakes

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Measurement Period: 2022

This indicator reports the chloride levels (ppm) in surface water samples from lakes in the City of Madison.

Why is this important?

Similar to drinking water trends, chloride in surface waters have also reported increases. Although the average chloride levels in each of the sampled lakes (Lakes Mendota, Monona, Waubesa, Kegonsa, and Wingra) do not pose an immediate risk to human health these levels could impact the ecology of Dane County lakes. This is especially true for Lake Wingra, which consistently displays higher levels of chloride than any other Yahara chain lake and continues to increase.

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