A peer reviewed study published by the Environmental Working Group proposes that nitrate pollution of U.S. drinking water may cause from 2300 to 12,594 cases of cancer per year. Most of these cases are in the rural farmland area where agronomic inputs, septic systems and home lawns becomes the source of this contamination. Currently, the EPA acceptable level is 10ppm, but the EWG wants to see a lower level, about 0.14 ppm.
These statistical studies make a lot of inferences based on diverse data, so it is important to recognize the limit of this.
Jeff Stoltzfus, Penn State's Farm Food Safety Educator, was kind enough to provide some facts. First, the baseline level, or background level, found in undisturbed aquifers is 1ppm and as high as 3ppm. Vegetables and meat also contribute significant amounts of nitrates to our diet. Finally, there are many, many activities we engage in each day that represent a higher risk than this.
Environmental Research, online 11 June 2019, https://doi.org/10.1016/j.envres.2019.04.009
https://www.sciencedirect.com/science/article/pii/S001393511930218X?via%3Dihub
Exposure-based assessment and economic valuation of adverse birth outcomes and cancer risk due to nitrate in United States drinking water.
Alexis Temkin a, Sydney Evans a, Tatiana Manidis b, Chris Campbell a, Olga V. Naidenko a
https://doi.org/10.1016/j.envres.2019.04.009
Highlights
- First of its kind national analysis assessing nitrate exposure from drinking water for the entire U.S. population.
- 2,300 to 12,594 nitrate-attributable cancer cases annually in the U.S., of which 54-82% are colorectal cancer (CRC) cases.
- Up to $1.5 and $6.5 billion in medical and indirect costs may be associated with annual nitrate-attributable cancer cases.
- Meta-analysis of eight studies assessing nitrate in drinking water and CRC supports a health benchmark of 0.14 mg/L