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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Rockford

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0710 ppm107ND - 0.490 ppm
20130.468 ppm43ND - 1.80 ppm
20140.950 ppm21ND - 1.90 ppm
20150.701 ppm104ND - 3.30 ppm
20161.46 ppm330.0300 ppm - 4.30 ppm
20172.40 ppm112.40 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
2012-04-252043207-010.490 ppm
2012-04-252043207-060.0200 ppm
2012-04-252043207-050.0200 ppm
2012-04-252043207-040.0500 ppm
2012-04-252043207-030.0300 ppm
2012-05-162052166-030.0800 ppm
2012-06-202062941-01ND
2012-06-202062941-020.0200 ppm
2012-06-202062941-05ND
2012-06-212062941-04ND
2013-03-123031609-010.0200 ppm
2013-06-283063989-01ND
2013-12-113121606-010.0500 ppm
2013-12-113121606-021.80 ppm
2014-07-304074473-011.90 ppm
2014-12-034120551-01ND
2015-04-225043414-021.50 ppm
2015-05-135051942-06ND
2015-05-135051942-011.90 ppm
2015-05-205053045-01ND
2015-05-275053787-02ND
2015-06-035060644-01ND
2015-06-105061807-01ND
2015-10-215103178-020.310 ppm
2015-10-215103178-06ND
2015-10-215103178-043.30 ppm
2016-04-206043262-034.30 ppm
2016-04-276044108-020.0500 ppm
2016-06-086061378-010.0300 ppm
2017-07-267075066-012.40 ppm