Know Your Environment. Protect Your Health.

Nitrate and nitrite

Kingwood Water Board

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.

 

5

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
20190.420 ppm110.420 ppm
2020N/A00N/A
20210.395 ppm220.390 ppm - 0.400 ppm
20220.430 ppm110.430 ppm
20230.280 ppm110.280 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
2019-02-1219021352-01A0.420 ppm
2021-03-0473624600010.390 ppm
2021-03-0473624610010.400 ppm
2022-04-05304786300020.430 ppm
2023-02-15305629520010.280 ppm