Nitrate
Gafford Chapel Water Supply Corporation
Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. 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 | 0.0588 ppm | 2 | 2 | 0.0555 ppm - 0.0620 ppm |
| 2019 | 0.0570 ppm | 2 | 2 | 0.0490 ppm - 0.0649 ppm |
| 2020 | 0.0618 ppm | 2 | 2 | 0.0510 ppm - 0.0725 ppm |
| 2021 | 0.160 ppm | 2 | 2 | 0.0605 ppm - 0.259 ppm |
| 2022 | 0.0948 ppm | 2 | 2 | 0.0942 ppm - 0.0953 ppm |
| 2023 | 0.0486 ppm | 2 | 2 | 0.0463 ppm - 0.0509 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
The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-04-12 | Q1815138005 | 0.0620 ppm |
| 2018-04-12 | Q1815138016 | 0.0555 ppm |
| 2019-05-22 | Q1927789001 | 0.0490 ppm |
| 2019-05-22 | Q1927789002 | 0.0649 ppm |
| 2020-02-20 | Q2006545007 | 0.0725 ppm |
| 2020-02-20 | Q2006545008 | 0.0510 ppm |
| 2021-10-14 | Q2128874008 | 0.0605 ppm |
| 2021-10-14 | Q2128874009 | 0.259 ppm |
| 2022-07-27 | Q2221394007 | 0.0942 ppm |
| 2022-07-27 | Q2221394010 | 0.0953 ppm |
| 2023-07-18 | Q2327998001 | 0.0463 ppm |
| 2023-07-18 | Q2327998002 | 0.0509 ppm |