Nitrate and nitrite
Dalton Utilities
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.
17
Samples
0
Samples exceeding legal limit (MCL)
10
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.220 ppm | 2 | 2 | 0.220 ppm |
| 2015 | 0.127 ppm | 3 | 1 | ND - 0.380 ppm |
| 2016 | 0.137 ppm | 3 | 1 | ND - 0.410 ppm |
| 2017 | 0.227 ppm | 3 | 2 | ND - 0.410 ppm |
| 2018 | 0.357 ppm | 3 | 3 | 0.270 ppm - 0.450 ppm |
| 2019 | 0.137 ppm | 3 | 1 | ND - 0.410 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 |
|---|---|---|
| 2014-08-12 | AI49235 | 0.220 ppm |
| 2014-08-12 | AI49234 | 0.220 ppm |
| 2015-09-28 | AI91268 | 0.380 ppm |
| 2015-09-28 | AI91267 | ND |
| 2015-09-28 | AI91266 | ND |
| 2016-10-05 | AJ30645 | 0.410 ppm |
| 2016-10-05 | AJ30644 | ND |
| 2016-10-05 | AJ30643 | ND |
| 2017-09-13 | AJ67597 | 0.410 ppm |
| 2017-09-13 | AJ67596 | 0.270 ppm |
| 2017-09-13 | AJ67595 | ND |
| 2018-11-05 | AK05236 | 0.350 ppm |
| 2018-11-05 | AK05235 | 0.270 ppm |
| 2018-11-05 | AK05234 | 0.450 ppm |
| 2019-12-02 | AK37371 | ND |
| 2019-12-02 | AK37373 | 0.410 ppm |
| 2019-12-02 | AK37372 | ND |