Nitrate and nitrite
Del City
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.
54
Samples
0
Samples exceeding legal limit (MCL)
53
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.660 ppm | 9 | 9 | 0.140 ppm - 2.45 ppm |
| 2015 | 0.713 ppm | 9 | 9 | 0.280 ppm - 2.73 ppm |
| 2016 | 0.744 ppm | 9 | 9 | 0.350 ppm - 2.80 ppm |
| 2017 | 0.711 ppm | 9 | 9 | 0.380 ppm - 2.65 ppm |
| 2018 | 0.743 ppm | 9 | 9 | 0.290 ppm - 2.94 ppm |
| 2019 | 0.757 ppm | 9 | 9 | 0.310 ppm - 2.93 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 |
|---|---|---|
| 2014-02-27 | 040265.009 | 0.140 ppm |
| 2014-02-27 | 040265.008 | 0.500 ppm |
| 2014-02-27 | 040265.007 | 0.470 ppm |
| 2014-02-27 | 040265.006 | 2.45 ppm |
| 2014-02-27 | 040265.005 | 0.400 ppm |
| 2014-02-27 | 040265.004 | 0.450 ppm |
| 2014-02-27 | 040265.003 | 0.420 ppm |
| 2014-02-27 | 040265.002 | 0.570 ppm |
| 2014-02-27 | 040265.001 | 0.540 ppm |
| 2015-03-03 | 053656.006 | 2.73 ppm |
| 2015-03-03 | 053656.001 | 0.570 ppm |
| 2015-03-03 | 053656.002 | 0.590 ppm |
| 2015-03-03 | 053656.003 | 0.470 ppm |
| 2015-03-03 | 053656.004 | 0.450 ppm |
| 2015-03-03 | 053656.005 | 0.420 ppm |
| 2015-03-03 | 053656.007 | 0.470 ppm |
| 2015-03-03 | 053656.008 | 0.440 ppm |
| 2015-03-03 | 053656.009 | 0.280 ppm |
| 2016-03-15 | SDWA-1013851-00 | 0.570 ppm |
| 2016-03-15 | SDWA-1013859-00 | 0.350 ppm |
| 2016-03-15 | SDWA-1013858-00 | 0.500 ppm |
| 2016-03-15 | SDWA-1013857-00 | 0.510 ppm |
| 2016-03-15 | SDWA-1013856-00 | 2.80 ppm |
| 2016-03-15 | SDWA-1013855-00 | 0.400 ppm |
| 2016-03-15 | SDWA-1013854-00 | 0.450 ppm |
| 2016-03-15 | SDWA-1013853-00 | 0.550 ppm |
| 2016-03-15 | SDWA-1013852-00 | 0.570 ppm |
| 2017-01-18 | SDWA-1116308-00 | 2.65 ppm |
| 2017-01-18 | SDWA-1116306-00 | 0.380 ppm |
| 2017-01-18 | SDWA-1116304-00 | 0.440 ppm |
| 2017-01-18 | SDWA-1116302-00 | 0.480 ppm |
| 2017-01-18 | SDWA-1116300-00 | 0.490 ppm |
| 2017-01-18 | SDWA-1116298-00 | 0.390 ppm |
| 2017-01-18 | SDWA-1116296-00 | 0.560 ppm |
| 2017-01-18 | SDWA-1116294-00 | 0.560 ppm |
| 2017-01-18 | SDWA-1116292-00 | 0.450 ppm |
| 2018-01-18 | SDWA-1227906-00 | 0.510 ppm |
| 2018-01-18 | SDWA-1227896-00 | 0.340 ppm |
| 2018-01-18 | SDWA-1227898-00 | 0.610 ppm |
| 2018-01-18 | SDWA-1227900-00 | 0.590 ppm |
| 2018-01-18 | SDWA-1227902-00 | 0.290 ppm |
| 2018-01-18 | SDWA-1227904-00 | 0.530 ppm |
| 2018-01-18 | SDWA-1227908-00 | 0.470 ppm |
| 2018-01-18 | SDWA-1227910-00 | 0.410 ppm |
| 2018-01-18 | SDWA-1227917-00 | 2.94 ppm |
| 2019-03-07 | SDWA-1338768-00 | 0.310 ppm |
| 2019-03-07 | SDWA-1338788-00 | 2.93 ppm |
| 2019-03-07 | SDWA-1338782-00 | 0.400 ppm |
| 2019-03-07 | SDWA-1338780-00 | 0.460 ppm |
| 2019-03-07 | SDWA-1338778-00 | 0.490 ppm |
| 2019-03-07 | SDWA-1338776-00 | 0.520 ppm |
| 2019-03-07 | SDWA-1338774-00 | 0.550 ppm |
| 2019-03-07 | SDWA-1338772-00 | 0.580 ppm |
| 2019-03-07 | SDWA-1338770-00 | 0.570 ppm |