Nitrate
St. Johns County Sawgrass Grid
Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.0179 ppm | 4 | 2 | ND - 0.0408 ppm |
2015 | 0.0178 ppm | 2 | 2 | 0.0154 ppm - 0.0202 ppm |
2016 | 0.0501 ppm | 2 | 2 | 0.0397 ppm - 0.0605 ppm |
2017 | ND | 2 | 0 | ND |
2018 | 0.0173 ppm | 2 | 2 | 0.0138 ppm - 0.0207 ppm |
2019 | 0.0222 ppm | 2 | 2 | 0.0188 ppm - 0.0255 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.
EPA Maximum Contaminant
Level (MCL) 10 ppm
The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.
ppm = parts per million
All test results
Date | Result |
---|---|
2014-12-02 | 0.0408 ppm |
2014-12-02 | 0.0307 ppm |
2014-12-03 | ND |
2014-12-03 | ND |
2015-06-11 | 0.0202 ppm |
2015-06-11 | 0.0154 ppm |
2016-03-03 | 0.0397 ppm |
2016-03-03 | 0.0605 ppm |
2017-08-02 | ND |
2017-08-02 | ND |
2018-07-09 | 0.0207 ppm |
2018-07-09 | 0.0138 ppm |
2019-03-04 | 0.0255 ppm |
2019-03-04 | 0.0188 ppm |