Nitrate and nitrite
Union PWS
Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.
36
Samples
0
Samples exceeding legal limit (MCL)
13
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.230 ppm | 7 | 6 | ND - 0.620 ppm |
| 2015 | 0.171 ppm | 6 | 5 | ND - 0.630 ppm |
| 2016 | 0.202 ppm | 5 | 5 | 0.0220 ppm - 0.630 ppm |
| 2017 | 0.176 ppm | 6 | 6 | 0.0310 ppm - 0.570 ppm |
| 2018 | 0.205 ppm | 6 | 6 | 0.0270 ppm - 0.720 ppm |
| 2019 | 0.234 ppm | 6 | 6 | 0.0320 ppm - 0.840 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.
EPA Maximum Contaminant
Level (MCL) 10 ppm
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-27 | AC17136 | 0.620 ppm |
| 2014-01-27 | AC17137 | 0.580 ppm |
| 2014-01-27 | AC17138 | 0.290 ppm |
| 2014-09-09 | AC34881 | 0.0540 ppm |
| 2014-09-09 | AC34880 | 0.0360 ppm |
| 2014-10-02 | AC35484 | ND |
| 2014-10-02 | AC35485 | 0.0300 ppm |
| 2015-09-02 | AC57913 | ND |
| 2015-09-02 | AC57911 | 0.630 ppm |
| 2015-09-02 | AC57914 | 0.290 ppm |
| 2015-09-02 | AC57915 | 0.0340 ppm |
| 2015-09-02 | AC57912 | 0.0360 ppm |
| 2015-11-04 | AC63687 | 0.0340 ppm |
| 2016-08-17 | AC82129 | 0.630 ppm |
| 2016-08-17 | AC82126 | 0.290 ppm |
| 2016-08-17 | AC82128 | 0.0220 ppm |
| 2016-08-17 | AC82127 | 0.0360 ppm |
| 2016-08-17 | AC82124 | 0.0310 ppm |
| 2017-08-21 | AD03759 | 0.0450 ppm |
| 2017-08-21 | AD03760 | 0.0870 ppm |
| 2017-08-21 | AD03758 | 0.0310 ppm |
| 2017-08-22 | AD03756 | 0.570 ppm |
| 2017-08-22 | AD03761 | 0.280 ppm |
| 2017-08-22 | AD03757 | 0.0400 ppm |
| 2018-08-21 | AD30881 | 0.0390 ppm |
| 2018-08-21 | AD30882 | 0.720 ppm |
| 2018-08-21 | AD30883 | 0.350 ppm |
| 2018-08-21 | AD30884 | 0.0270 ppm |
| 2018-08-21 | AD30885 | 0.0400 ppm |
| 2018-08-21 | AD30886 | 0.0560 ppm |
| 2019-08-27 | AD53695 | 0.0320 ppm |
| 2019-08-27 | AD53696 | 0.360 ppm |
| 2019-08-27 | AD53697 | 0.0380 ppm |
| 2019-08-27 | AD53698 | 0.0920 ppm |
| 2019-08-27 | AD53699 | 0.0400 ppm |
| 2019-08-27 | AD53700 | 0.840 ppm |