My understanding is that the monitoring wells measure groundwater so the drinking water standards are relevant.
Yeah, the total is just there because I thought it would be better to make the data visible than not. Overall it's pretty meaningless but it might help in some narrow instances where you're looking at one small area versus another small area in the same timeframe. Sometimes the wells are very close together and different colored icons get overlaid so it's not clear from the map that numbers are even that high.
You're the author? I think you have a parsing issue. I'm looking at barium: apparently the color-coding only looks at the number, discarding the unit (ug vs. mg). The MCL is 1 mg/L; for a measurement of "514 ug/L" (=0.514 mg/L), you code it as >100x Federal Threshold:
And for more confirmation, on the sidebar, the 0.220 mg/L measurement maps to the minimum of "0.220" (out of the 2 measurements in the field of view), and the 514 ug/L maps to the maximum "514.000". They should be 0.220 and 0.514 (mg/L).
Your map shows severe Barium pollution over the whole region, but that's just this error repeated many times.
Yeah, the total is just there because I thought it would be better to make the data visible than not. Overall it's pretty meaningless but it might help in some narrow instances where you're looking at one small area versus another small area in the same timeframe. Sometimes the wells are very close together and different colored icons get overlaid so it's not clear from the map that numbers are even that high.