Know Your Environment. Protect Your Health.

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20190.598 ppm12120.230 ppm - 0.760 ppm
20200.848 ppm660.590 ppm - 1.60 ppm
20210.500 ppm110.500 ppm
20220.400 ppm21ND - 0.800 ppm
20230.700 ppm220.400 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
2018-02-05AE20663ND
2018-02-05AE20663ND
2019-02-06354470950010.490 ppm
2019-02-06354470950010.490 ppm
2019-08-08354886010010.760 ppm
2019-08-08354886020030.740 ppm
2019-08-08354886020020.700 ppm
2019-08-08354886010020.670 ppm
2019-08-08354886020030.740 ppm
2019-08-08354886020020.700 ppm
2019-08-08354886010020.670 ppm
2019-08-08354886010010.760 ppm
2019-11-05355099670020.230 ppm
2019-11-05355099670020.230 ppm
2020-02-10355297610010.590 ppm
2020-06-22355581610020.700 ppm
2020-06-22355581610010.610 ppm
2020-08-20355724340010.720 ppm
2020-11-23355948390010.870 ppm
2020-12-17355999240011.60 ppm
2021-03-15B2101148-0010.500 ppm
2022-02-28B2200929-0010.800 ppm
2022-09-26B2204684-001ND
2023-04-10B2301568-0021.000 ppm
2023-08-28B2303560-0020.400 ppm