Know Your Environment. Protect Your Health.

Nitrate and nitrite

Harbour Point S/d

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.

 

7

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND10ND
2020ND20ND
2021N/A00N/A
2022N/A00N/A
20230.617 ppm74ND - 1.90 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
2023-05-09752-6726-1ND
2023-05-10752-6771-11.90 ppm
2023-10-25752-13009-10.910 ppm
2023-10-25752-13009-2ND
2023-10-25752-13009-3ND
2023-10-25752-13009-40.690 ppm
2023-11-14752-13687-10.820 ppm