Nitrate and nitrite
Crawford County Water System
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.
12
Samples
0
Samples exceeding legal limit (MCL)
12
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.645 ppm | 2 | 2 | 0.570 ppm - 0.720 ppm |
| 2015 | 0.700 ppm | 2 | 2 | 0.630 ppm - 0.770 ppm |
| 2016 | 0.685 ppm | 2 | 2 | 0.610 ppm - 0.760 ppm |
| 2017 | 0.620 ppm | 2 | 2 | 0.620 ppm |
| 2018 | 0.735 ppm | 2 | 2 | 0.700 ppm - 0.770 ppm |
| 2019 | 0.675 ppm | 2 | 2 | 0.660 ppm - 0.690 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 |
|---|---|---|
| 2014-04-22 | AI38624 | 0.720 ppm |
| 2014-04-22 | AI38625 | 0.570 ppm |
| 2015-08-18 | AI86960 | 0.770 ppm |
| 2015-08-18 | AI86961 | 0.630 ppm |
| 2016-08-22 | AJ23540 | 0.760 ppm |
| 2016-08-22 | AJ23541 | 0.610 ppm |
| 2017-03-29 | AJ49181 | 0.620 ppm |
| 2017-03-29 | AJ49182 | 0.620 ppm |
| 2018-12-11 | AK07904 | 0.770 ppm |
| 2018-12-11 | AK07907 | 0.700 ppm |
| 2019-12-11 | AK38227 | 0.690 ppm |
| 2019-12-11 | AK38228 | 0.660 ppm |