Nitrate and nitrite
Trampas Mutual Domestic Water Consumers Association
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.
12
Samples
0
Samples exceeding legal limit (MCL)
11
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.835 ppm | 2 | 2 | 0.230 ppm - 1.44 ppm |
| 2015 | 0.740 ppm | 2 | 2 | 0.220 ppm - 1.26 ppm |
| 2016 | 0.700 ppm | 2 | 1 | ND - 1.40 ppm |
| 2017 | 0.815 ppm | 2 | 2 | 0.210 ppm - 1.42 ppm |
| 2018 | 0.825 ppm | 2 | 2 | 0.220 ppm - 1.43 ppm |
| 2019 | 0.715 ppm | 2 | 2 | 0.220 ppm - 1.21 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 |
|---|---|---|
| 2014-11-04 | 2014034499 | 1.44 ppm |
| 2014-11-04 | 2014034500 | 0.230 ppm |
| 2015-09-15 | 2015028674 | 1.26 ppm |
| 2015-09-15 | 2015028675 | 0.220 ppm |
| 2016-11-15 | 2016033389 | 1.40 ppm |
| 2016-11-15 | 2016033390 | ND |
| 2017-02-07 | 2017003931 | 1.42 ppm |
| 2017-02-07 | 2017003932 | 0.210 ppm |
| 2018-02-27 | 2018006807 | 0.220 ppm |
| 2018-02-27 | 2018006808 | 1.43 ppm |
| 2019-05-14 | 2019013328 | 1.21 ppm |
| 2019-05-14 | 2019013329 | 0.220 ppm |