Know Your Environment. Protect Your Health.

Nitrate and nitrite

St. Tam Parish-faubourg-coquille

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.

 

34

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
20190.0400 ppm102ND - 0.200 ppm
20200.0400 ppm51ND - 0.200 ppm
20210.120 ppm53ND - 0.200 ppm
2022ND50ND
2023ND50ND

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
2018-07-02B1802971-001ND
2018-07-02B1802971-002ND
2018-07-02B1802971-001ND
2018-07-02B1802971-002ND
2019-01-31B1900565-0010.200 ppm
2019-01-31B1900565-002ND
2019-01-31B1900565-003ND
2019-01-31B1900565-004ND
2019-01-31B1900565-0010.200 ppm
2019-01-31B1900565-002ND
2019-01-31B1900565-003ND
2019-01-31B1900565-004ND
2019-10-15B1904646-001ND
2019-10-15B1904646-001ND
2020-06-09B2002822-005ND
2020-06-09B2002822-006ND
2020-06-09B2002822-004ND
2020-07-28B2003759-0010.200 ppm
2020-10-27B2005746-001ND
2021-06-22B2102792-0010.200 ppm
2021-07-27B2103398-0010.200 ppm
2021-07-27B2103398-002ND
2021-07-27B2103398-0030.200 ppm
2021-07-27B2103398-004ND
2022-03-29B2201494-002ND
2022-03-29B2201494-005ND
2022-03-29B2201494-004ND
2022-03-29B2201494-003ND
2022-03-29B2201494-001ND
2023-06-26B2302638-005ND
2023-06-26B2302638-006ND
2023-06-26B2302638-007ND
2023-06-26B2302638-008ND
2023-08-30B2303652-001ND