Nitrate
Holley-Navarre Water System
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.312 ppm | 9 | 5 | ND - 1.20 ppm |
| 2015 | 0.450 ppm | 10 | 10 | 0.0310 ppm - 1.30 ppm |
| 2016 | 0.550 ppm | 10 | 10 | 0.0480 ppm - 1.20 ppm |
| 2017 | 0.409 ppm | 10 | 9 | ND - 1.10 ppm |
| 2018 | 0.514 ppm | 10 | 10 | 0.0280 ppm - 1.000 ppm |
| 2019 | 0.367 ppm | 10 | 10 | 0.200 ppm - 0.690 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 |
|---|---|
| 2014-06-09 | ND |
| 2014-06-09 | ND |
| 2014-06-09 | ND |
| 2014-06-09 | 0.0520 ppm |
| 2014-06-26 | 0.250 ppm |
| 2014-06-26 | 0.210 ppm |
| 2014-06-26 | ND |
| 2014-06-26 | 1.20 ppm |
| 2014-07-01 | 1.10 ppm |
| 2015-07-09 | 0.0310 ppm |
| 2015-07-09 | 0.0380 ppm |
| 2015-07-09 | 0.0360 ppm |
| 2015-07-09 | 0.800 ppm |
| 2015-09-24 | 1.30 ppm |
| 2015-09-24 | 0.230 ppm |
| 2015-09-24 | 0.250 ppm |
| 2015-09-24 | 0.410 ppm |
| 2015-09-24 | 1.000 ppm |
| 2015-09-24 | 0.400 ppm |
| 2016-06-15 | 0.800 ppm |
| 2016-06-15 | 0.830 ppm |
| 2016-06-15 | 0.0800 ppm |
| 2016-06-15 | 0.0480 ppm |
| 2016-07-27 | 0.250 ppm |
| 2016-07-27 | 0.880 ppm |
| 2016-07-27 | 0.240 ppm |
| 2016-07-27 | 0.900 ppm |
| 2016-07-27 | 1.20 ppm |
| 2016-07-27 | 0.270 ppm |
| 2017-04-17 | 0.0410 ppm |
| 2017-04-17 | ND |
| 2017-04-17 | 0.740 ppm |
| 2017-04-17 | 0.0340 ppm |
| 2017-07-25 | 0.860 ppm |
| 2017-07-25 | 0.370 ppm |
| 2017-07-25 | 0.260 ppm |
| 2017-07-25 | 1.10 ppm |
| 2017-07-25 | 0.280 ppm |
| 2017-07-25 | 0.400 ppm |
| 2018-06-20 | 0.0430 ppm |
| 2018-06-20 | 0.680 ppm |
| 2018-06-20 | 0.0280 ppm |
| 2018-06-20 | 0.570 ppm |
| 2018-06-27 | 1.000 ppm |
| 2018-06-27 | 0.770 ppm |
| 2018-06-27 | 0.760 ppm |
| 2018-06-27 | 0.760 ppm |
| 2018-06-27 | 0.260 ppm |
| 2018-06-28 | 0.270 ppm |
| 2019-06-26 | 0.200 ppm |
| 2019-06-26 | 0.220 ppm |
| 2019-06-26 | 0.690 ppm |
| 2019-06-26 | 0.550 ppm |
| 2019-06-26 | 0.290 ppm |
| 2019-06-26 | 0.270 ppm |
| 2019-06-26 | 0.690 ppm |
| 2019-06-26 | 0.250 ppm |
| 2019-06-26 | 0.230 ppm |
| 2019-06-26 | 0.280 ppm |