Nitrate and nitrite
Tulsa
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.
47
Samples
0
Samples exceeding legal limit (MCL)
22
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.0625 ppm | 8 | 2 | ND - 0.270 ppm |
| 2015 | 0.183 ppm | 8 | 5 | ND - 0.350 ppm |
| 2016 | 0.366 ppm | 9 | 6 | ND - 1.10 ppm |
| 2017 | 0.120 ppm | 6 | 3 | ND - 0.270 ppm |
| 2018 | 0.108 ppm | 8 | 1 | ND - 0.860 ppm |
| 2019 | 0.273 ppm | 8 | 5 | ND - 0.720 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 |
|---|---|---|
| 2014-01-07 | 1030126 | 0.230 ppm |
| 2014-01-14 | 1031768 | ND |
| 2014-04-01 | 1050838 | 0.270 ppm |
| 2014-04-01 | 1050672 | ND |
| 2014-07-01 | 1073010 | ND |
| 2014-07-01 | 1072730 | ND |
| 2014-10-07 | 1098611 | ND |
| 2014-10-09 | 1099375 | ND |
| 2015-01-06 | 1120361 | 0.260 ppm |
| 2015-01-06 | 1120331 | 0.350 ppm |
| 2015-04-07 | 1142484 | 0.320 ppm |
| 2015-04-07 | 1142542 | ND |
| 2015-07-07 | 1165726 | ND |
| 2015-07-07 | 1165723 | 0.310 ppm |
| 2015-10-06 | 1189755 | ND |
| 2015-10-06 | 1189710 | 0.220 ppm |
| 2016-01-05 | 1211573 | ND |
| 2016-01-05 | 1211526 | 0.530 ppm |
| 2016-01-05 | 1211525 | 0.430 ppm |
| 2016-04-05 | 1233119 | 0.260 ppm |
| 2016-04-05 | 1233089 | 1.10 ppm |
| 2016-07-05 | 1255909 | 0.340 ppm |
| 2016-07-05 | 1255847 | 0.630 ppm |
| 2016-10-04 | 1280325 | ND |
| 2016-10-04 | 1280309 | ND |
| 2017-01-03 | 1302705 | ND |
| 2017-01-03 | 1302565 | 0.240 ppm |
| 2017-04-04 | 1326690 | 0.210 ppm |
| 2017-04-04 | 1326616 | 0.270 ppm |
| 2017-07-05 | 1352028 | ND |
| 2017-07-06 | 1352350 | ND |
| 2018-01-02 | 1399641 | ND |
| 2018-01-02 | 1399575 | ND |
| 2018-04-03 | 1424158 | ND |
| 2018-04-06 | 1425450 | 0.860 ppm |
| 2018-07-03 | 1449416 | ND |
| 2018-07-03 | 1449322 | ND |
| 2018-10-02 | 1473824 | ND |
| 2018-10-02 | 1473641 | ND |
| 2019-01-08 | 1499039 | ND |
| 2019-01-08 | 1498850 | 0.200 ppm |
| 2019-04-02 | 1521855 | 0.580 ppm |
| 2019-04-02 | 1521637 | 0.230 ppm |
| 2019-07-02 | 1545368 | 0.450 ppm |
| 2019-07-02 | 1545333 | 0.720 ppm |
| 2019-10-01 | 1569646 | ND |
| 2019-10-01 | 1569751 | ND |