Know Your Environment. Protect Your Health.

Nitrate and nitrite

Granton Waterworks

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
20201.65 ppm21ND - 3.30 ppm
2021N/A00N/A
20221.65 ppm21ND - 3.30 ppm
20230.900 ppm21ND - 1.80 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
2020-01-2811711553.30 ppm
2020-04-201184246ND
2022-08-091328710ND
2022-08-0913287093.30 ppm
2023-05-23CB05432-04ND
2023-05-23CB05432-011.80 ppm