Nitrate and nitrite
Lexington & Joseph Harp Correctional Institution
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.
35
Samples
0
Samples exceeding legal limit (MCL)
17
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.170 ppm | 6 | 4 | ND - 0.480 ppm |
| 2015 | 0.164 ppm | 5 | 4 | ND - 0.460 ppm |
| 2016 | 0.230 ppm | 5 | 5 | 0.1000 ppm - 0.470 ppm |
| 2017 | 0.165 ppm | 6 | 4 | ND - 0.500 ppm |
| 2018 | 0.185 ppm | 6 | 4 | ND - 0.480 ppm |
| 2019 | 0.201 ppm | 7 | 5 | ND - 0.510 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 |
|---|---|---|
| 2014-06-10 | 044152.006 | ND |
| 2014-06-10 | 044152.005 | 0.480 ppm |
| 2014-06-10 | 044152.004 | 0.150 ppm |
| 2014-06-10 | 044152.003 | 0.280 ppm |
| 2014-06-10 | 044152.002 | 0.110 ppm |
| 2014-06-10 | 044152.001 | ND |
| 2015-06-30 | 057408.004 | 0.1000 ppm |
| 2015-06-30 | 057408.002 | ND |
| 2015-06-30 | 057408.003 | 0.160 ppm |
| 2015-06-30 | 057408.005 | 0.460 ppm |
| 2015-06-30 | 057408.006 | 0.1000 ppm |
| 2016-07-27 | SDWA-1044872-00 | 0.470 ppm |
| 2016-07-27 | SDWA-1044866-00 | 0.1000 ppm |
| 2016-07-27 | SDWA-1044860-00 | 0.260 ppm |
| 2016-07-27 | SDWA-1044858-00 | 0.110 ppm |
| 2016-07-27 | SDWA-1044851-00 | 0.210 ppm |
| 2017-01-12 | SDWA-1116472-00 | ND |
| 2017-06-14 | SDWA-1166309-00 | 0.500 ppm |
| 2017-06-14 | SDWA-1166307-00 | 0.110 ppm |
| 2017-06-14 | SDWA-1166305-00 | 0.270 ppm |
| 2017-06-14 | SDWA-1166303-00 | 0.110 ppm |
| 2017-06-14 | SDWA-1166301-00 | ND |
| 2018-05-30 | SDWA-1260012-00 | 0.120 ppm |
| 2018-05-30 | SDWA-1260010-00 | ND |
| 2018-05-30 | SDWA-1260014-00 | 0.260 ppm |
| 2018-05-30 | SDWA-1260016-00 | ND |
| 2018-05-30 | SDWA-1260018-00 | 0.480 ppm |
| 2018-06-15 | SDWA-1273421-00 | 0.250 ppm |
| 2019-02-06 | SDWA-1338919-00 | ND |
| 2019-03-06 | SDWA-1356224-00 | 0.510 ppm |
| 2019-03-06 | SDWA-1356222-00 | ND |
| 2019-03-06 | SDWA-1356220-00 | 0.270 ppm |
| 2019-03-06 | SDWA-1356218-00 | 0.120 ppm |
| 2019-03-06 | SDWA-1356216-00 | 0.250 ppm |
| 2019-05-06 | SDWA-1372692-00 | 0.260 ppm |