Nitrate and nitrite
Ripley County Public Water Supply District 1 West
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.
17
Samples
0
Samples exceeding legal limit (MCL)
9
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.291 ppm | 3 | 2 | ND - 0.860 ppm |
| 2015 | 0.135 ppm | 2 | 1 | ND - 0.270 ppm |
| 2016 | 0.167 ppm | 3 | 2 | ND - 0.250 ppm |
| 2017 | 0.147 ppm | 3 | 2 | ND - 0.220 ppm |
| 2018 | 0.0873 ppm | 3 | 2 | ND - 0.240 ppm |
| 2019 | 0.150 ppm | 3 | 2 | ND - 0.240 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 |
|---|---|---|
| 2014-04-02 | AC22137 | 0.860 ppm |
| 2014-04-02 | AC22138 | 0.0120 ppm |
| 2014-04-02 | AC22136 | ND |
| 2015-10-27 | AC62623 | 0.270 ppm |
| 2015-10-27 | AC62624 | ND |
| 2016-10-03 | AC85539 | 0.250 ppm |
| 2016-10-03 | AC85541 | ND |
| 2016-10-03 | AC85540 | 0.250 ppm |
| 2017-10-06 | AD08140 | 0.220 ppm |
| 2017-10-06 | AD08139 | ND |
| 2017-10-06 | AD08141 | 0.220 ppm |
| 2018-10-17 | AD34580 | 0.0220 ppm |
| 2018-10-17 | AD34581 | 0.240 ppm |
| 2018-10-17 | AD34582 | ND |
| 2019-10-09 | AD56966 | 0.240 ppm |
| 2019-10-09 | AD56967 | 0.210 ppm |
| 2019-10-09 | AD56968 | ND |