Daily Archives: September 9, 2012

Inequity of revised arsenic rule for very small systems

Jones, S.A., and Nicole, J. The inequity of the Revised Arsenic Rule for very small community drinking water systems. Environmental Science & Policy, Volume 9, Issue 6, October 2006, Pages 555-562

The U.S. Environmental Protection Agency (EPA) recently reduced the maximum contaminant level for arsenic in community drinking water systems from 50 to 10 ppb. EPA uses net benefit analyses aggregated at the national-scale to set drinking water standards. Such aggregation may result in compliance options that are not cost-effective for very small systems, and may limit opportunities for these communities to receive variances. We completed a benefit-cost analysis and an affordability analysis of 14 tribal communities in Arizona to better understand the regulation’s impact on very small water systems ranging from 6 to 95 service connections. Compliance alternatives included both technological and non-technological solutions. Health benefits were based on an EPA study of morbidity and mortality. The results show that all communities can comply with feasible alternatives; however, the tangible costs of the revised arsenic regulation far outweigh the expected health benefits and do not meet EPA’s affordability criteria. The results support other studies that suggest a more equitable regulatory-setting process is needed to consider both health and economic impacts. Otherwise, the unintended result is a shifting of resources among risks instead of actual risk reduction.

Click here for the full paper (fee).

Oregon Surface Temperature, 1870-2011

Using the Berkeley Earth Surface Temperature (BEST) data here, the following plot was created. It represents regional climate change for the State of Oregon. The plot shows the mean monthly surface temperature, the mean daily maximum surface temperature, and the mean daily minimum surface temperture. Compare the plot below with that provided here based on the same underlying data.

More work is needed to examine the BEST data and algorithms, but this first cut suggests that the people sounding alarms over an impending climate catastrophe are in a world of their own. The historical record suggests a very broad yet defined band of highly variable temperatures. This might be more apparent if the actual data is plotted rather than mean values. We’ll work on presenting that in the future, as it will take some time to dig through the BEST data set. The data for the graph below (and the others I have posted) are the means calculated by BEST.