Nitrate and nitrite
Alpine Lakes Ranch Water Company
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.129 ppm | 3 | 2 | ND - 0.311 ppm |
| 2019 | 0.110 ppm | 3 | 3 | 0.0750 ppm - 0.152 ppm |
| 2020 | 0.0477 ppm | 3 | 3 | 0.0280 ppm - 0.0720 ppm |
| 2021 | 0.0767 ppm | 3 | 2 | ND - 0.186 ppm |
| 2022 | 0.127 ppm | 10 | 6 | ND - 0.646 ppm |
| 2023 | 0.0537 ppm | 3 | 1 | ND - 0.161 ppm |
ppm = parts per million
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.14 ppm
The EWG 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 | Result |
|---|---|
| 2018-06-18 | 0.311 ppm |
| 2018-08-15 | ND |
| 2018-08-28 | 0.0760 ppm |
| 2019-08-12 | 0.152 ppm |
| 2019-08-13 | 0.104 ppm |
| 2019-08-28 | 0.0750 ppm |
| 2020-09-15 | 0.0280 ppm |
| 2020-10-12 | 0.0430 ppm |
| 2020-10-12 | 0.0720 ppm |
| 2021-09-02 | 0.0440 ppm |
| 2021-09-02 | ND |
| 2021-09-02 | 0.186 ppm |
| 2022-02-21 | 0.190 ppm |
| 2022-02-21 | ND |
| 2022-05-09 | ND |
| 2022-05-09 | 0.151 ppm |
| 2022-07-21 | 0.646 ppm |
| 2022-07-21 | ND |
| 2022-11-17 | 0.0803 ppm |
| 2022-11-22 | 0.154 ppm |
| 2022-11-22 | ND |
| 2022-12-29 | 0.0487 ppm |
| 2023-02-13 | 0.161 ppm |
| 2023-02-13 | ND |
| 2023-08-01 | ND |