3 ms·
Ermm, my city's well closest to me has the following: MRL Tested chromium 0.2 0.67 vanadium 0.2 1.1 strontium 0.3 960 chromium-6 0.03 0.44
by jonah 10y ago
Ermm, my city's well closest to me has the following:
MRL Tested
chromium 0.2 0.67
vanadium 0.2 1.1
strontium 0.3 960
chromium-6 0.03 0.44
chlorate 20 190
molybdenum 1 8.7
[Edit] to change "Allowable" to "MRL":
"The lowest amount of an analyte in a sample that can be quantitatively determined with stated, acceptable precision and accuracy under stated analytical conditions (i.e. the lower limit of quantitation). Therefore, analyses are calibrated to the MRL, or lower. To take into account day-to-day fluctuations in instrument sensitivity, analyst performance, and other factors, the MRL is established at three times the MDL (or greater)."
[Edit 2] In my town's overall distribution system there are multiple samples above the allowable Reference Concentration. The highest were:
Tested Allowable
strontium 1900 1500
chlorate 410 210
- ianlevesque 10y agoThose look like the MRLs, not the reference concentrations. For example Chlorate isn't (maybe) a cause for concern unless above 210, not 20.
- jonah 10y agoOh, you're right. Tested Ref. Amt (MCL) IRIS RfD (u g/kg/day) chromium 0.67 50 3 vanadium 1.1 21 7 strontium 960 1,500 chromium-6 0.44 NA chlorate 190 210 molybdenum 8.7 40 5 Some levels from: https://www3.epa.gov/region9/water/drinking/files/dwsha_0607.pdf https://www3.epa.gov/region9/water/drinking/files/dwsha_0607...
- akiselev 10y agoAre you in Wisconsin, a region with large amounts of fracking, or near a nuclear disposal site, by any chance? Such a large molybdenum concentration is exceptionally rare as far as I know.
- jonah 10y agoCoastal Southern California. There are numerous wells (including some using fracking) within 15-50 miles.
- 13of40 10y agoI've got a similar mix in Washington State, far away from any fracking. Chromium, strontium, and vanadium, at least. Edit: Western Washington, not close to any kind of Hanford runoff.
- akiselev 10y agoChromium, strontium, and vanadium can enter groundwater from many different sources including water seeping through concentrated deposits and industrial pollution. It's the molybdenum concentration that caught my eye because it is unusually rare due to mineral insolubility. It's only when high pressure fracing chemicals oxidize molybdenum does it become readily soluble in untapped deposits, causing it to seep down.