Know Your Environment. Protect Your Health.

Nitrate and nitrite

Oklahoma University

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.

 

0

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.354 ppm2724ND - 0.758 ppm
20190.399 ppm2827ND - 0.721 ppm
20200.428 ppm27270.202 ppm - 0.830 ppm
20210.382 ppm35350.188 ppm - 0.905 ppm
20220.392 ppm31310.135 ppm - 0.910 ppm
20230.521 ppm13130.255 ppm - 0.886 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