Know Your Environment. Protect Your Health.

Nitrate and nitrite

The Calverton School

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
2023ND20ND

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
2018-01-25157398_01ND
2018-01-25157512_01ND
2018-02-05E18002819001ND
2019-01-25167483_01ND
2019-01-25167601_01ND
2020-01-21180700_01ND
2020-03-03E20003011002ND
2021-01-12198019_01ND
2021-01-12198152_01ND
2022-01-25216615_01ND
2022-01-25216616_01ND
2023-03-28232714-01ND
2023-03-28232715-01ND