Nitrate
Green Bay Waterworks
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.0330 ppm | 1 | 1 | 0.0330 ppm |
| 2015 | 0.140 ppm | 9 | 9 | 0.0370 ppm - 0.460 ppm |
| 2016 | 0.108 ppm | 9 | 9 | 0.0190 ppm - 0.470 ppm |
| 2017 | 0.0517 ppm | 9 | 6 | ND - 0.290 ppm |
| 2018 | 0.102 ppm | 9 | 9 | 0.0290 ppm - 0.550 ppm |
| 2019 | 0.0334 ppm | 9 | 2 | ND - 0.270 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 |
|---|---|---|
| 2014-05-19 | 790065 | 0.0330 ppm |
| 2015-04-20 | 855110 | 0.0370 ppm |
| 2015-04-20 | 855123 | 0.460 ppm |
| 2015-04-20 | 855003 | 0.390 ppm |
| 2015-04-20 | 855124 | 0.110 ppm |
| 2015-04-20 | 855126 | 0.0590 ppm |
| 2015-04-20 | 855125 | 0.0530 ppm |
| 2015-04-20 | 855108 | 0.0530 ppm |
| 2015-04-20 | 855107 | 0.0520 ppm |
| 2015-06-18 | 866694 | 0.0460 ppm |
| 2016-03-08 | 908890 | 0.0190 ppm |
| 2016-03-08 | 908892 | 0.0230 ppm |
| 2016-03-08 | 908889 | 0.0270 ppm |
| 2016-03-08 | 908887 | 0.0280 ppm |
| 2016-03-08 | 908893 | 0.0300 ppm |
| 2016-03-08 | 908886 | 0.0320 ppm |
| 2016-03-08 | 908894 | 0.0390 ppm |
| 2016-03-08 | 908891 | 0.470 ppm |
| 2016-04-12 | 914902 | 0.300 ppm |
| 2017-04-17 | 983524 | 0.0770 ppm |
| 2017-04-17 | 983520 | 0.0270 ppm |
| 2017-04-17 | 983527 | 0.0250 ppm |
| 2017-04-17 | 983523 | 0.0230 ppm |
| 2017-04-17 | 983526 | ND |
| 2017-04-17 | 983521 | ND |
| 2017-04-17 | 983525 | 0.0230 ppm |
| 2017-04-24 | 984913 | 0.290 ppm |
| 2017-10-16 | 1024818 | ND |
| 2018-06-19 | 1062314 | 0.0530 ppm |
| 2018-06-19 | 1062318 | 0.550 ppm |
| 2018-06-19 | 1062313 | 0.0950 ppm |
| 2018-06-19 | 1062311 | 0.0510 ppm |
| 2018-06-19 | 1062317 | 0.0420 ppm |
| 2018-06-19 | 1062316 | 0.0340 ppm |
| 2018-06-19 | 1062310 | 0.0310 ppm |
| 2018-06-19 | 1062312 | 0.0310 ppm |
| 2018-06-19 | 1062315 | 0.0290 ppm |
| 2019-05-22 | 1122573 | 0.270 ppm |
| 2019-06-10 | 1126391 | ND |
| 2019-06-10 | 1126398 | ND |
| 2019-06-10 | 1126392 | ND |
| 2019-06-10 | 1126397 | ND |
| 2019-06-10 | 1126394 | ND |
| 2019-06-10 | 1126396 | ND |
| 2019-06-10 | 1126393 | ND |
| 2019-06-10 | 1126395 | 0.0310 ppm |