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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

West Sound Utility District #1

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.

MORE ABOUT THIS CONTAMINANT

 

81

Samples

0

Samples exceeding legal limit (MCL)

28

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.373 ppm135ND - 1.51 ppm
20150.458 ppm138ND - 1.01 ppm
20160.371 ppm145ND - 1.40 ppm
20170.186 ppm144ND - 1.000 ppm
20180.294 ppm144ND - 1.80 ppm
20190.200 ppm132ND - 1.53 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
2014-07-0801703ND
2014-07-0801703ND
2014-07-0801704ND
2014-07-0801704ND
2014-07-08017050.670 ppm
2014-07-08017050.670 ppm
2014-07-0801706ND
2014-07-0801707ND
2014-07-0801703ND
2014-07-09017231.47 ppm
2014-07-09017220.530 ppm
2014-07-09017211.51 ppm
2014-07-0901720ND
2015-05-12015230.710 ppm
2015-05-1201522ND
2015-05-1201522ND
2015-05-12015200.940 ppm
2015-05-12015200.940 ppm
2015-05-12015200.940 ppm
2015-05-12015241.01 ppm
2015-05-12015210.380 ppm
2015-05-12015210.380 ppm
2015-05-13014510.654 ppm
2015-05-1301448ND
2015-05-1301449ND
2015-05-1301450ND
2016-05-10ND
2016-05-101.30 ppm
2016-05-100.600 ppm
2016-05-10ND
2016-05-10ND
2016-05-10ND
2016-05-100.600 ppm
2016-05-10ND
2016-05-101.30 ppm
2016-05-101.40 ppm
2016-05-10ND
2016-05-11ND
2016-05-11ND
2016-05-11ND
2017-05-100.300 ppm
2017-05-100.300 ppm
2017-05-10ND
2017-05-10ND
2017-05-101.000 ppm
2017-05-10ND
2017-05-10ND
2017-05-101.000 ppm
2017-05-10ND
2017-05-10ND
2017-05-10ND
2017-07-24ND
2017-07-24ND
2017-12-21ND
2018-05-09ND
2018-05-09ND
2018-05-09ND
2018-05-091.80 ppm
2018-05-091.30 ppm
2018-05-090.510 ppm
2018-05-090.510 ppm
2018-05-10ND
2018-05-10ND
2018-05-10ND
2018-07-03ND
2018-07-03ND
2018-07-03ND
2018-07-06ND
2019-03-28ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-151.07 ppm
2019-05-15ND
2019-05-15ND
2019-05-151.53 ppm