Nitrate and nitrite
City of Henderson
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.
26
Samples
0
Samples exceeding legal limit (MCL)
26
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.583 ppm | 4 | 4 | 0.570 ppm - 0.600 ppm |
| 2015 | 0.613 ppm | 4 | 4 | 0.560 ppm - 0.680 ppm |
| 2016 | 0.555 ppm | 4 | 4 | 0.519 ppm - 0.590 ppm |
| 2017 | 0.562 ppm | 4 | 4 | 0.451 ppm - 0.665 ppm |
| 2018 | 0.547 ppm | 5 | 5 | 0.442 ppm - 0.622 ppm |
| 2019 | 0.508 ppm | 5 | 5 | 0.441 ppm - 0.569 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 |
|---|---|---|
| 2014-01-13 | 14010141-005 | 0.580 ppm |
| 2014-04-07 | 14040087-005 | 0.580 ppm |
| 2014-07-23 | 14070408-005 | 0.570 ppm |
| 2014-10-06 | 14100035-005 | 0.600 ppm |
| 2015-01-05 | 14120546-005 | 0.630 ppm |
| 2015-04-06 | 15040041-005 | 0.680 ppm |
| 2015-07-06 | 15070058-005 | 0.560 ppm |
| 2015-10-05 | 15100029-004 | 0.580 ppm |
| 2016-01-04 | 15120509-004 | 0.590 ppm |
| 2016-04-04 | 16030498-004 | 0.560 ppm |
| 2016-07-05 | S1601354001 | 0.519 ppm |
| 2016-10-03 | S1603871001 | 0.550 ppm |
| 2017-01-03 | S1606027001 | 0.580 ppm |
| 2017-04-03 | S1701101001 | 0.665 ppm |
| 2017-07-05 | S1702195001 | 0.451 ppm |
| 2017-10-03 | S1707053001 | 0.552 ppm |
| 2018-01-02 | S1709126001 | 0.587 ppm |
| 2018-04-03 | S1800045001 | 0.442 ppm |
| 2018-07-25 | S1804430001 | 0.508 ppm |
| 2018-10-02 | S1805049001 | 0.622 ppm |
| 2018-11-12 | S1806806001 | 0.578 ppm |
| 2019-01-07 | S1808185001 | 0.551 ppm |
| 2019-04-09 | S1902357001 | 0.506 ppm |
| 2019-05-14 | S1908728001 | 0.475 ppm |
| 2019-07-09 | S1917090001 | 0.441 ppm |
| 2019-10-22 | S1951221001 | 0.569 ppm |