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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Los Angeles Department of Water and Power

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.

 

53

Samples

0

Samples exceeding legal limit (MCL)

42

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.851 ppm95ND - 2.45 ppm
20131.11 ppm98ND - 2.29 ppm
20141.84 ppm880.430 ppm - 3.69 ppm
20151.83 ppm990.550 ppm - 3.25 ppm
20161.62 ppm990.470 ppm - 3.77 ppm
20170.253 ppm93ND - 1.04 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
2012-01-181200-205-12000.510 ppm
2012-02-021200-133-10000.820 ppm
2012-02-141200-011-1020ND
2012-05-171200-011-0900ND
2012-05-221200-133-10452.05 ppm
2012-08-141200-011-1200ND
2012-08-141200-133-10302.45 ppm
2012-11-131200-133-08401.83 ppm
2012-11-131200-011-1035ND
2013-02-201200-133-12001.59 ppm
2013-03-201200-011-1050ND
2013-05-091200-133-08251.40 ppm
2013-05-091200-011-10250.470 ppm
2013-08-131200-133-10402.29 ppm
2013-08-131200-011-12350.470 ppm
2013-10-081200-205-11451.38 ppm
2013-11-191200-011-10450.480 ppm
2013-11-191200-133-08001.92 ppm
2014-02-261200-011-12150.560 ppm
2014-02-261200-133-12151.63 ppm
2014-05-141200-011-11150.630 ppm
2014-05-141200-133-11053.68 ppm
2014-08-121200-011-10300.430 ppm
2014-08-201200-133-09003.47 ppm
2014-11-121200-011-12400.630 ppm
2014-11-181200-133-09353.69 ppm
2015-02-111200-133-08252.81 ppm
2015-02-191200-011-08450.650 ppm
2015-05-191200-133-11003.25 ppm
2015-05-191200-011-09001.01 ppm
2015-08-041200-011-10400.900 ppm
2015-08-041200-133-06452.83 ppm
2015-10-201200-205-11551.76 ppm
2015-11-051200-133-07552.69 ppm
2015-11-051200-011-10050.550 ppm
2016-02-091200-133-09302.09 ppm
2016-02-241200-011-12150.690 ppm
2016-05-251200-011-11350.670 ppm
2016-05-251200-133-12102.81 ppm
2016-07-211200-205-12250.930 ppm
2016-08-171200-011-10100.470 ppm
2016-08-231200-133-10052.63 ppm
2016-11-211200-133-11153.77 ppm
2016-11-291200-011-08450.520 ppm
2017-02-211200-011-1140ND
2017-02-211200-133-12101.04 ppm
2017-05-091200-011-0940ND
2017-05-171200-133-09410.530 ppm
2017-07-121200-205-10000.710 ppm
2017-08-011200-133-0940ND
2017-08-211200-011-1010ND
2017-11-201200-011-1000ND
2017-11-201200-133-1040ND