EWG's Tap Water Database — 2019 UPDATE


Nitrate and nitrite

Livingston County Public Water Supply District 4

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.0300 ppm110.0300 ppm
20130.0210 ppm110.0210 ppm
20140.0150 ppm110.0150 ppm
20150.0130 ppm110.0130 ppm
20160.0250 ppm110.0250 ppm
20170.0200 ppm110.0200 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The 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
2012-06-11AB754440.0300 ppm
2013-06-25AC016210.0210 ppm
2014-06-17AC269260.0150 ppm
2015-07-06AC546380.0130 ppm
2016-07-13AC801390.0250 ppm
2017-07-18AD017380.0200 ppm