Know Your Environment. Protect Your Health.

Nitrate and nitrite

Gardner Community Water System

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0190 ppm64ND - 0.0290 ppm
2019ND60ND
2020ND60ND
20210.200 ppm330.200 ppm
2022ND30ND
2023ND40ND

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
2018-11-09354303540010.0290 ppm
2018-11-09354303540020.0280 ppm
2018-11-0935430354003ND
2018-11-09354303540010.0290 ppm
2018-11-09354303540020.0280 ppm
2018-11-0935430354003ND
2019-08-1235489858003ND
2019-08-1235489858004ND
2019-08-1235489858002ND
2019-08-1235489858003ND
2019-08-1235489858004ND
2019-08-1235489858002ND
2020-01-23B2000290-003ND
2020-01-23B2000290-002ND
2020-01-23B2000290-001ND
2020-02-18B2000821-002ND
2020-10-0735583245003ND
2020-10-0735583245002ND
2021-06-01B2102659-0010.200 ppm
2021-06-01B2102659-0020.200 ppm
2021-06-01B2102659-0030.200 ppm
2022-03-24B2201365-001ND
2022-03-24B2201365-002ND
2022-03-24B2201365-003ND
2023-01-17B2300205-004ND
2023-01-17B2300205-005ND
2023-01-17B2300205-006ND
2023-02-07B2300574-002ND