Nitrate and nitrite
Star Valley Ranch, Town Of
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.
24
Samples
0
Samples exceeding legal limit (MCL)
21
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.325 ppm | 8 | 8 | 0.1000 ppm - 0.500 ppm |
| 2015 | 0.325 ppm | 4 | 4 | 0.1000 ppm - 0.600 ppm |
| 2016 | 0.375 ppm | 4 | 4 | 0.200 ppm - 0.600 ppm |
| 2017 | 0.410 ppm | 4 | 4 | 0.160 ppm - 0.700 ppm |
| 2018 | 0.405 ppm | 4 | 4 | 0.170 ppm - 0.680 ppm |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-11-12 | C14110520-001C | 0.500 ppm |
| 2014-11-12 | C14110520-002C | 0.500 ppm |
| 2014-11-12 | C14110520-003C | 0.1000 ppm |
| 2014-11-12 | C14110520-004C | 0.200 ppm |
| 2014-11-12 | C14110520-001 N | 0.500 ppm |
| 2014-11-12 | C14110520-003 N | 0.1000 ppm |
| 2014-11-12 | C14110520-004 N | 0.200 ppm |
| 2014-11-12 | C14110520-002 N | 0.500 ppm |
| 2015-07-20 | C15070718-001D | 0.1000 ppm |
| 2015-07-20 | C15070718-004D | 0.400 ppm |
| 2015-07-20 | C15070718-003D | 0.200 ppm |
| 2015-07-20 | C15070718-002D | 0.600 ppm |
| 2016-07-21 | C16070732-004A | 0.400 ppm |
| 2016-07-21 | C16070732-003A | 0.300 ppm |
| 2016-07-21 | C16070732-002A | 0.600 ppm |
| 2016-07-21 | C16070732-001A | 0.200 ppm |
| 2017-08-01 | C17080089-011A | 0.160 ppm |
| 2017-08-01 | C17080089-014A | 0.250 ppm |
| 2017-08-01 | C17080089-013A | 0.530 ppm |
| 2017-08-01 | C17080089-012A | 0.700 ppm |
| 2018-08-13 | C18080510-001E | 0.170 ppm |
| 2018-08-13 | C18080510-003E | 0.680 ppm |
| 2018-08-13 | C18080510-002E | 0.260 ppm |
| 2018-08-13 | C18080510-004E | 0.510 ppm |