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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

City of Redmond Water System

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

25

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.978 ppm54ND - 1.60 ppm
20130.950 ppm43ND - 1.40 ppm
20140.857 ppm32ND - 1.70 ppm
20150.918 ppm43ND - 1.60 ppm
20160.998 ppm43ND - 1.90 ppm
20170.796 ppm53ND - 1.70 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2012-07-1310230ND
2012-07-13102311.000 ppm
2012-07-13102281.60 ppm
2012-07-13102291.30 ppm
2012-07-16270850.990 ppm
2013-07-11092181.000 ppm
2013-07-1109221ND
2013-07-11092201.40 ppm
2013-07-11092191.40 ppm
2014-07-09102980.870 ppm
2014-07-0910299ND
2014-07-09103001.70 ppm
2015-05-04062430.870 ppm
2015-05-04062441.60 ppm
2015-05-0406245ND
2015-07-22114841.20 ppm
2016-05-181.10 ppm
2016-05-18ND
2016-05-181.90 ppm
2016-05-180.990 ppm
2017-05-030.580 ppm
2017-05-03ND
2017-05-03ND
2017-05-031.70 ppm
2017-05-031.70 ppm