Nitrate and nitrite
Lebanon
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.
41
Samples
0
Samples exceeding legal limit (MCL)
40
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 | 0.736 ppm | 7 | 7 | 0.320 ppm - 1.28 ppm |
| 2015 | 0.664 ppm | 7 | 7 | 0.310 ppm - 1.31 ppm |
| 2016 | 0.681 ppm | 7 | 7 | 0.280 ppm - 1.29 ppm |
| 2017 | 0.754 ppm | 7 | 7 | 0.0510 ppm - 1.39 ppm |
| 2018 | 0.979 ppm | 7 | 7 | 0.520 ppm - 1.90 ppm |
| 2019 | 0.652 ppm | 6 | 6 | 0.420 ppm - 0.960 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 |
|---|---|---|
| 2014-08-21 | AC32110 | 1.28 ppm |
| 2014-08-21 | AC32111 | 1.25 ppm |
| 2014-08-21 | AC32112 | 0.610 ppm |
| 2014-08-21 | AC32113 | 0.720 ppm |
| 2014-08-21 | AC32114 | 0.370 ppm |
| 2014-08-21 | AC32109 | 0.320 ppm |
| 2014-08-25 | AC32115 | 0.600 ppm |
| 2015-02-19 | AC42375 | 0.640 ppm |
| 2015-02-19 | AC42371 | 0.380 ppm |
| 2015-02-19 | AC42374 | 0.430 ppm |
| 2015-02-19 | AC42372 | 0.310 ppm |
| 2015-02-19 | AC42370 | 1.31 ppm |
| 2015-02-19 | AC42369 | 1.20 ppm |
| 2015-02-19 | AC42373 | 0.380 ppm |
| 2016-02-29 | AC66564 | 0.700 ppm |
| 2016-02-29 | AC66565 | 0.700 ppm |
| 2016-02-29 | AC66563 | 1.29 ppm |
| 2016-02-29 | AC66568 | 0.630 ppm |
| 2016-02-29 | AC66569 | 0.280 ppm |
| 2016-02-29 | AC66567 | 0.450 ppm |
| 2016-02-29 | AC66566 | 0.720 ppm |
| 2017-02-16 | AC91231 | 1.12 ppm |
| 2017-02-16 | AC91230 | 0.770 ppm |
| 2017-02-16 | AC91227 | 0.830 ppm |
| 2017-02-16 | AC91229 | 0.740 ppm |
| 2017-02-16 | AC91225 | 0.0510 ppm |
| 2017-02-16 | AC91226 | 1.39 ppm |
| 2017-02-16 | AC91228 | 0.380 ppm |
| 2018-03-21 | AD14656 | 0.670 ppm |
| 2018-03-21 | AD14661 | 0.670 ppm |
| 2018-03-21 | AD14660 | 0.750 ppm |
| 2018-03-21 | AD14659 | 0.520 ppm |
| 2018-03-21 | AD14658 | 0.690 ppm |
| 2018-03-21 | AD14657 | 1.90 ppm |
| 2018-03-21 | AD14655 | 1.65 ppm |
| 2019-03-04 | AD39580 | 0.710 ppm |
| 2019-03-04 | AD39581 | 0.550 ppm |
| 2019-03-04 | AD39582 | 0.960 ppm |
| 2019-03-04 | AD39583 | 0.550 ppm |
| 2019-03-04 | AD39584 | 0.720 ppm |
| 2019-03-04 | AD39585 | 0.420 ppm |