Nitrate and nitrite
St. Martin Parish Industrial Park Ws
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 | ND | 2 | 0 | ND |
| 2019 | 0.598 ppm | 12 | 12 | 0.230 ppm - 0.760 ppm |
| 2020 | 0.848 ppm | 6 | 6 | 0.590 ppm - 1.60 ppm |
| 2021 | 0.500 ppm | 1 | 1 | 0.500 ppm |
| 2022 | 0.400 ppm | 2 | 1 | ND - 0.800 ppm |
| 2023 | 0.700 ppm | 2 | 2 | 0.400 ppm - 1.000 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 |
|---|---|---|
| 2018-02-05 | AE20663 | ND |
| 2018-02-05 | AE20663 | ND |
| 2019-02-06 | 35447095001 | 0.490 ppm |
| 2019-02-06 | 35447095001 | 0.490 ppm |
| 2019-08-08 | 35488601001 | 0.760 ppm |
| 2019-08-08 | 35488602003 | 0.740 ppm |
| 2019-08-08 | 35488602002 | 0.700 ppm |
| 2019-08-08 | 35488601002 | 0.670 ppm |
| 2019-08-08 | 35488602003 | 0.740 ppm |
| 2019-08-08 | 35488602002 | 0.700 ppm |
| 2019-08-08 | 35488601002 | 0.670 ppm |
| 2019-08-08 | 35488601001 | 0.760 ppm |
| 2019-11-05 | 35509967002 | 0.230 ppm |
| 2019-11-05 | 35509967002 | 0.230 ppm |
| 2020-02-10 | 35529761001 | 0.590 ppm |
| 2020-06-22 | 35558161002 | 0.700 ppm |
| 2020-06-22 | 35558161001 | 0.610 ppm |
| 2020-08-20 | 35572434001 | 0.720 ppm |
| 2020-11-23 | 35594839001 | 0.870 ppm |
| 2020-12-17 | 35599924001 | 1.60 ppm |
| 2021-03-15 | B2101148-001 | 0.500 ppm |
| 2022-02-28 | B2200929-001 | 0.800 ppm |
| 2022-09-26 | B2204684-001 | ND |
| 2023-04-10 | B2301568-002 | 1.000 ppm |
| 2023-08-28 | B2303560-002 | 0.400 ppm |