Know Your Environment. Protect Your Health.

Nitrate and nitrite

Mystic Harbour

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND30ND
2020ND10ND
2021ND10ND
2022ND30ND
2023N/A00N/A

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
2018-10-23E19001378001ND
2019-12-10AP121019ND
2019-12-10MH121019ND
2019-12-10SV121019ND
2020-07-21E21000199003ND
2021-09-150230011_091521_TP05ND
2022-08-10AP081022ND
2022-08-10MHWTPND
2022-08-10SVWTP,SV082222ND