Nitrate and nitrite
Lisbon North Inc.
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | N/A | 0 | 0 | N/A |
2015 | 0.910 ppm | 3 | 3 | 0.640 ppm - 1.26 ppm |
2016 | 0.400 ppm | 1 | 1 | 0.400 ppm |
2017 | 0.0700 ppm | 1 | 1 | 0.0700 ppm |
2018 | 0.0800 ppm | 1 | 1 | 0.0800 ppm |
2019 | ND | 1 | 0 | ND |
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 |
---|---|---|
2015-04-08 | 389555_56_57_58_ | 0.640 ppm |
2015-07-08 | 391849 | 0.830 ppm |
2015-10-14 | 394444 | 1.26 ppm |
2016-05-11 | 399756 | 0.400 ppm |
2017-04-12 | 408676 | 0.0700 ppm |
2018-05-09 | 423492 | 0.0800 ppm |
2019-05-08 | 432279 | ND |