Know Your Environment. Protect Your Health.

Nitrate and nitrite

Slidell Water Supply

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND160ND
2020ND40ND
20210.200 ppm440.200 ppm
2022ND40ND
20230.0571 ppm72ND - 0.200 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
2018-06-21B1802749-003ND
2018-06-21B1802749-001ND
2018-06-21B1802749-002ND
2018-06-21B1802749-003ND
2018-06-21B1802749-004ND
2018-06-21B1802749-002ND
2018-06-21B1802749-001ND
2018-06-21B1802749-004ND
2019-02-01B1900563-004ND
2019-02-01B1900563-003ND
2019-02-01B1900563-002ND
2019-02-01B1900563-001ND
2019-02-01B1900563-001ND
2019-02-01B1900563-002ND
2019-02-01B1900563-003ND
2019-02-01B1900563-004ND
2019-04-16B1901553-002ND
2019-04-16B1901553-001ND
2019-04-16B1901553-001ND
2019-04-16B1901553-002ND
2019-07-09B1902924-002ND
2019-07-09B1902924-001ND
2019-07-09B1902924-001ND
2019-07-09B1902924-002ND
2020-09-29B2005140-001ND
2020-09-29B2005140-002ND
2020-09-29B2005140-003ND
2020-09-29B2005140-004ND
2021-06-11B2102714-0010.200 ppm
2021-06-11B2102714-0020.200 ppm
2021-06-11B2102714-0030.200 ppm
2021-06-11B2102714-0040.200 ppm
2022-06-06B2202673-005ND
2022-06-06B2202673-008ND
2022-06-06B2202673-007ND
2022-06-06B2202673-006ND
2023-05-23B2302140-001ND
2023-05-23B2302140-0020.200 ppm
2023-05-23B2302140-003ND
2023-09-25B2304196-001ND
2023-09-25B2304196-0020.200 ppm
2023-09-25B2304196-003ND
2023-09-25B2304196-004ND