Nitrate and nitrite
Pulaski County Public Water Supply District 2
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.286 ppm | 6 | 5 | ND - 0.690 ppm |
| 2019 | 0.288 ppm | 6 | 5 | ND - 0.740 ppm |
| 2020 | 0.276 ppm | 6 | 5 | ND - 0.701 ppm |
| 2021 | 0.333 ppm | 6 | 5 | ND - 0.895 ppm |
| 2022 | 0.321 ppm | 6 | 5 | ND - 0.779 ppm |
| 2023 | 0.363 ppm | 6 | 5 | ND - 0.922 ppm |
ppm = parts per million
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.14 ppm
The EWG 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 |
|---|---|---|
| 2018-02-07 | AD14600 | 0.550 ppm |
| 2018-02-28 | AD14551 | 0.270 ppm |
| 2018-02-28 | AD14553 | 0.690 ppm |
| 2018-02-28 | AD14554 | 0.0840 ppm |
| 2018-02-28 | AD14555 | 0.120 ppm |
| 2018-03-05 | AD17400 | ND |
| 2019-02-13 | AD39730 | 0.300 ppm |
| 2019-02-13 | AD39731 | 0.560 ppm |
| 2019-02-13 | AD39729 | 0.0390 ppm |
| 2019-02-13 | AD39728 | 0.740 ppm |
| 2019-02-13 | AD39727 | 0.0900 ppm |
| 2019-02-13 | AD39726 | ND |
| 2020-02-14 | 2001549 | 0.0850 ppm |
| 2020-02-14 | 2001548 | 0.302 ppm |
| 2020-02-14 | 2001547 | 0.0370 ppm |
| 2020-02-14 | 2001550 | 0.531 ppm |
| 2020-02-14 | 2001551 | ND |
| 2020-02-14 | 2001552 | 0.701 ppm |
| 2021-02-22 | 2100418 | 0.895 ppm |
| 2021-02-22 | 2100786 | 0.309 ppm |
| 2021-02-22 | 2100785 | 0.600 ppm |
| 2021-02-22 | 2100420 | 0.112 ppm |
| 2021-02-22 | 2100421 | ND |
| 2021-02-22 | 2100419 | 0.0820 ppm |
| 2022-02-10 | 2202084 | 0.779 ppm |
| 2022-02-10 | 2202085 | 0.189 ppm |
| 2022-02-10 | 2202083 | 0.589 ppm |
| 2022-02-10 | 2202086 | 0.0420 ppm |
| 2022-02-10 | 2202087 | ND |
| 2022-02-10 | 2202082 | 0.327 ppm |
| 2023-02-09 | 2300705 | 0.0810 ppm |
| 2023-02-09 | 2300707 | ND |
| 2023-02-09 | 2300704 | 0.922 ppm |
| 2023-02-09 | 2300702 | 0.339 ppm |
| 2023-02-09 | 2300706 | 0.201 ppm |
| 2023-02-09 | 2300703 | 0.632 ppm |