Nitrate and nitrite
Virgin Valley Water District
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.
39
Samples
0
Samples exceeding legal limit (MCL)
27
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.492 ppm | 6 | 4 | ND - 1.50 ppm |
| 2015 | 0.523 ppm | 6 | 4 | ND - 1.50 ppm |
| 2016 | 0.603 ppm | 6 | 5 | ND - 1.40 ppm |
| 2017 | 0.622 ppm | 6 | 5 | ND - 1.40 ppm |
| 2018 | 0.574 ppm | 9 | 6 | ND - 1.40 ppm |
| 2019 | 0.840 ppm | 6 | 5 | ND - 1.60 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 |
|---|---|---|
| 2014-07-16 | 1407469-003 | 0.700 ppm |
| 2014-07-16 | 1407469-004 | 0.110 ppm |
| 2014-07-16 | 1407469-005 | ND |
| 2014-07-16 | 1407469-006 | 0.640 ppm |
| 2014-07-16 | 1407469-001 | 1.50 ppm |
| 2014-07-16 | 1407469-002 | ND |
| 2015-07-15 | 1507436-006 | 0.510 ppm |
| 2015-07-15 | 1507436-001 | 1.50 ppm |
| 2015-07-15 | 1507436-005 | ND |
| 2015-07-15 | 15071436-004 | 0.130 ppm |
| 2015-07-15 | 1507436-003 | 1.000 ppm |
| 2015-07-15 | 1507436-002 | ND |
| 2016-07-20 | 1607586-002 | 0.470 ppm |
| 2016-07-20 | 1607586-003 | 0.730 ppm |
| 2016-07-20 | 1607586-004 | 0.300 ppm |
| 2016-07-20 | 1607586-005 | ND |
| 2016-07-20 | 1607586-006 | 0.720 ppm |
| 2016-07-20 | 1607586-001 | 1.40 ppm |
| 2017-07-19 | 1707521-003 | 0.760 ppm |
| 2017-07-19 | 1707521-001 | 1.40 ppm |
| 2017-07-19 | 1707521-006 | 0.760 ppm |
| 2017-07-19 | 1707521-004 | 0.390 ppm |
| 2017-07-19 | 1707521-002 | 0.420 ppm |
| 2017-07-19 | 1707521-005 | ND |
| 2018-06-20 | 1806612-003 | 0.830 ppm |
| 2018-06-20 | 1806612-002 | 0.520 ppm |
| 2018-06-20 | 1806612-001 | 1.40 ppm |
| 2018-07-05 | 1807098-001 | ND |
| 2018-07-05 | 1807098-002 | 1.10 ppm |
| 2018-07-05 | 1807099-001 | 0.860 ppm |
| 2018-07-18 | 1807612-001 | 0.460 ppm |
| 2018-07-18 | 1807612-002 | ND |
| 2018-09-19 | 18090629-001 | ND |
| 2019-06-19 | 19060631-001 | 1.60 ppm |
| 2019-06-19 | 19060631-002 | 1.40 ppm |
| 2019-07-01 | 19070015-001 | 0.770 ppm |
| 2019-07-17 | 19070638-002 | 0.420 ppm |
| 2019-07-17 | 19070638-001 | 0.850 ppm |
| 2019-09-30 | 19091007-001 | ND |