Nitrate
Oakdale
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 |
---|---|---|---|---|
2014 | 1.07 ppm | 12 | 12 | 0.0600 ppm - 2.60 ppm |
2015 | 1.20 ppm | 6 | 6 | 0.190 ppm - 2.50 ppm |
2016 | 1.07 ppm | 6 | 6 | 0.160 ppm - 2.30 ppm |
2017 | 1.16 ppm | 6 | 6 | 0.150 ppm - 2.60 ppm |
2018 | 0.607 ppm | 3 | 3 | 0.0700 ppm - 1.50 ppm |
2019 | 0.777 ppm | 3 | 3 | 0.0900 ppm - 2.00 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 | Lab ID | Result |
---|---|---|
2014-04-09 | 14D0576-02 | 0.600 ppm |
2014-04-09 | 14D0576-01 | 1.20 ppm |
2014-04-09 | 14D0594-03 | 0.280 ppm |
2014-04-09 | 14D0594-02 | 1.80 ppm |
2014-04-09 | 14D0594-01 | 2.60 ppm |
2014-04-09 | 14D0591-03 | 0.0600 ppm |
2014-04-09 | 14D0591-02 | 0.600 ppm |
2014-04-09 | 14D0591-01 | 1.30 ppm |
2014-04-09 | 14D0577-02 | 0.280 ppm |
2014-04-09 | 14D0577-01 | 1.70 ppm |
2014-04-09 | 14D0576-04 | 2.30 ppm |
2014-04-09 | 14D0576-03 | 0.0600 ppm |
2015-07-06 | 15G0296-03 | 2.30 ppm |
2015-07-06 | 15G0296-04 | 0.280 ppm |
2015-07-06 | 15G0312-01 | 1.40 ppm |
2015-07-06 | 15G0312-02 | 0.540 ppm |
2015-11-18 | 15K1036-01 | 0.190 ppm |
2015-11-18 | 15K1036-03 | 2.50 ppm |
2016-07-26 | 16G1900-01 | 2.30 ppm |
2016-07-26 | 16G1905-03 | 0.170 ppm |
2016-07-26 | 16G1905-02 | 0.580 ppm |
2016-07-26 | 16G1905-01 | 1.30 ppm |
2016-07-26 | 16G1900-04 | 0.160 ppm |
2016-07-26 | 16G1900-03 | 1.90 ppm |
2017-08-09 | 17H0960-01 | 1.30 ppm |
2017-08-09 | 17H0960-02 | 0.680 ppm |
2017-08-09 | 17H0960-03 | 0.230 ppm |
2017-08-09 | 17H0962-01 | 2.60 ppm |
2017-08-09 | 17H0962-03 | 2.00 ppm |
2017-08-09 | 17H0962-04 | 0.150 ppm |
2018-04-17 | 18D0870-01 | 1.50 ppm |
2018-04-17 | 18D0870-02 | 0.250 ppm |
2018-04-17 | 18D0986-03 | 0.0700 ppm |
2019-08-13 | 19H1082-02 | 2.00 ppm |
2019-08-13 | 19H1082-03 | 0.240 ppm |
2019-08-13 | 19H1085-03 | 0.0900 ppm |