EWG's Tap Water Database — 2021 UPDATE


Nitrate and nitrite

Concord Water & Sewer Pfb of Crawford County

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
20140.250 ppm220.180 ppm - 0.320 ppm
20150.275 ppm220.150 ppm - 0.400 ppm
20160.155 ppm21ND - 0.310 ppm
20170.200 ppm220.120 ppm - 0.280 ppm
20180.190 ppm220.130 ppm - 0.250 ppm
20190.150 ppm21ND - 0.300 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