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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

Golden State Water Company (GSWC) - South Arcadia

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.

 

206

Samples

0

Samples exceeding legal limit (MCL)

206

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20122.35 ppm35350.542 ppm - 6.33 ppm
20132.64 ppm29290.700 ppm - 4.52 ppm
20142.94 ppm30300.745 ppm - 4.74 ppm
20152.94 ppm46460.768 ppm - 5.65 ppm
20162.94 ppm33330.830 ppm - 5.00 ppm
20172.79 ppm33330.870 ppm - 5.40 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
2012-01-102706-016-10152.71 ppm
2012-02-099588-002-10252.03 ppm
2012-02-099588-003-10151.81 ppm
2012-02-099588-004-09552.94 ppm
2012-02-099588-015-09402.26 ppm
2012-02-142706-016-12102.48 ppm
2012-03-132706-016-11242.71 ppm
2012-04-102706-016-10552.71 ppm
2012-05-082706-016-11422.71 ppm
2012-05-159588-002-10252.26 ppm
2012-05-159588-003-10402.24 ppm
2012-05-159588-004-10153.16 ppm
2012-05-159588-005-09150.655 ppm
2012-05-159588-015-09552.26 ppm
2012-06-122706-016-11322.21 ppm
2012-07-162706-016-11002.48 ppm
2012-08-142706-016-11322.71 ppm
2012-08-169588-002-10002.48 ppm
2012-08-169588-003-09452.26 ppm
2012-08-169588-006-09150.542 ppm
2012-08-169588-014-08500.700 ppm
2012-08-169588-015-09352.94 ppm
2012-08-212706-002-12153.61 ppm
2012-08-212706-003-12202.24 ppm
2012-08-212706-005-14000.949 ppm
2012-08-212706-006-13450.994 ppm
2012-08-212706-014-14202.71 ppm
2012-08-212706-015-13201.13 ppm
2012-09-112706-016-11292.48 ppm
2012-10-092706-016-11352.26 ppm
2012-11-132706-016-11372.48 ppm
2012-11-169588-002-10006.33 ppm
2012-11-169588-003-10102.26 ppm
2012-11-169588-015-09503.16 ppm
2012-12-102706-016-11152.48 ppm
2013-01-082706-016-12182.15 ppm
2013-02-122706-016-14372.94 ppm
2013-02-219588-003-11052.19 ppm
2013-02-219588-015-10502.71 ppm
2013-03-122706-016-11252.10 ppm
2013-04-092706-016-11452.17 ppm
2013-05-132706-016-12132.24 ppm
2013-05-159588-002-10453.84 ppm
2013-05-159588-003-10301.76 ppm
2013-05-159588-004-10204.52 ppm
2013-05-159588-005-09500.700 ppm
2013-05-159588-015-10002.94 ppm
2013-05-232706-004-10404.52 ppm
2013-06-112706-016-10513.16 ppm
2013-07-092706-016-12442.71 ppm
2013-08-122706-016-10402.71 ppm
2013-08-149588-002-11153.61 ppm
2013-08-149588-003-11302.26 ppm
2013-08-149588-004-11053.61 ppm
2013-08-149588-006-12000.723 ppm
2013-08-149588-014-12250.723 ppm
2013-08-289588-015-11352.94 ppm
2013-09-102706-016-10202.48 ppm
2013-10-082706-016-11352.71 ppm
2013-11-122706-016-12182.06 ppm
2013-11-149588-002-10554.52 ppm
2013-11-149588-003-10501.85 ppm
2013-11-149588-015-10403.16 ppm
2013-12-092706-016-11132.48 ppm
2014-01-132706-016-11132.12 ppm
2014-02-102706-016-10532.26 ppm
2014-02-269588-002-10052.48 ppm
2014-02-269588-003-10153.61 ppm
2014-02-269588-004-09554.52 ppm
2014-02-269588-015-10354.29 ppm
2014-03-102706-016-10413.16 ppm
2014-04-072706-016-12452.48 ppm
2014-05-142706-016-11482.94 ppm
2014-05-159588-002-11154.74 ppm
2014-05-159588-003-11251.78 ppm
2014-05-159588-004-11254.74 ppm
2014-05-159588-015-10503.16 ppm
2014-06-092706-016-11143.16 ppm
2014-06-249588-005-09400.926 ppm
2014-07-072706-016-11342.94 ppm
2014-08-112706-016-11442.26 ppm
2014-08-289588-002-10104.52 ppm
2014-08-289588-003-10201.72 ppm
2014-08-289588-004-10304.29 ppm
2014-08-289588-006-11000.881 ppm
2014-08-289588-014-10250.745 ppm
2014-09-112706-016-10153.16 ppm
2014-10-132706-016-11002.48 ppm
2014-11-059588-002-10354.07 ppm
2014-11-059588-004-10203.16 ppm
2014-11-059588-015-09553.39 ppm
2014-11-102706-016-11513.61 ppm
2014-11-179588-003-12002.10 ppm
2014-12-082706-016-10292.48 ppm
2015-01-122706-016-10203.16 ppm
2015-02-092706-016-11292.48 ppm
2015-02-199588-002-09353.16 ppm
2015-02-199588-003-09451.63 ppm
2015-02-199588-004-09253.16 ppm
2015-02-199588-015-09552.94 ppm
2015-03-092706-016-10532.48 ppm
2015-04-132706-016-10312.94 ppm
2015-05-112706-002-11152.94 ppm
2015-05-112706-003-10341.74 ppm
2015-05-112706-004-11304.29 ppm
2015-05-112706-016-10592.26 ppm
2015-05-199588-002-09452.71 ppm
2015-05-199588-003-09503.84 ppm
2015-05-199588-004-09353.39 ppm
2015-05-199588-005-10452.12 ppm
2015-05-199588-015-10202.94 ppm
2015-06-092706-016-09302.24 ppm
2015-07-142706-016-10303.16 ppm
2015-08-102706-016-10082.94 ppm
2015-08-132706-002-10215.20 ppm
2015-08-132706-003-10081.78 ppm
2015-08-132706-004-11055.65 ppm
2015-08-149588-002-09553.39 ppm
2015-08-149588-003-10052.71 ppm
2015-08-149588-004-09453.84 ppm
2015-08-149588-006-10451.42 ppm
2015-08-149588-014-11150.926 ppm
2015-08-149588-015-10353.39 ppm
2015-08-172706-002-10432.71 ppm
2015-08-172706-003-10482.48 ppm
2015-08-172706-005-09242.10 ppm
2015-08-172706-006-09151.24 ppm
2015-08-172706-014-09550.768 ppm
2015-08-172706-015-08352.94 ppm
2015-09-082706-016-10163.39 ppm
2015-10-122706-016-10173.39 ppm
2015-11-092706-002-09233.84 ppm
2015-11-092706-003-09171.78 ppm
2015-11-092706-004-10194.52 ppm
2015-11-092706-016-09312.48 ppm
2015-11-179588-002-09505.10 ppm
2015-11-179588-003-09401.70 ppm
2015-11-179588-004-10005.10 ppm
2015-11-179588-015-10153.20 ppm
2015-12-072706-016-10213.61 ppm
2016-01-112706-016-11502.30 ppm
2016-02-089590-003-08002.10 ppm
2016-02-089590-016-08001.60 ppm
2016-02-179588-003-09552.10 ppm
2016-02-179588-015-11253.30 ppm
2016-03-089588-004-10504.40 ppm
2016-03-082706-016-11062.90 ppm
2016-04-142706-016-10402.80 ppm
2016-05-102706-016-10073.00 ppm
2016-05-119588-003-10402.70 ppm
2016-05-119588-004-10304.70 ppm
2016-05-119588-005-11052.90 ppm
2016-05-119588-015-10553.40 ppm
2016-06-142706-016-10422.60 ppm
2016-06-202706-002-10463.90 ppm
2016-06-202706-004-10384.10 ppm
2016-06-229588-002-09103.70 ppm
2016-07-142706-016-12042.70 ppm
2016-08-082706-016-11402.80 ppm
2016-08-199588-002-10452.40 ppm
2016-08-199588-003-10552.00 ppm
2016-08-199588-004-10303.50 ppm
2016-08-199588-006-09201.60 ppm
2016-08-199588-014-08500.830 ppm
2016-08-199588-015-10103.20 ppm
2016-09-122706-016-11372.80 ppm
2016-10-102706-016-11243.00 ppm
2016-11-072706-016-09352.60 ppm
2016-11-179588-002-10054.30 ppm
2016-11-179588-003-10001.90 ppm
2016-11-179588-004-10455.00 ppm
2016-11-179588-015-11003.30 ppm
2016-12-122706-016-13082.50 ppm
2017-01-099590-016-11153.80 ppm
2017-02-149590-016-10263.60 ppm
2017-02-169588-002-10252.50 ppm
2017-02-169588-003-10351.50 ppm
2017-02-169588-004-10153.50 ppm
2017-02-169588-015-10552.90 ppm
2017-03-139590-016-10362.30 ppm
2017-04-109590-016-12552.20 ppm
2017-05-089590-016-09452.70 ppm
2017-05-169588-003-10202.10 ppm
2017-05-169588-004-10203.70 ppm
2017-05-169588-005-10402.90 ppm
2017-05-169588-015-11051.40 ppm
2017-07-109590-016-12403.00 ppm
2017-08-079590-016-14262.90 ppm
2017-08-109588-003-10002.10 ppm
2017-08-109588-004-10103.70 ppm
2017-08-109588-006-10351.30 ppm
2017-08-109588-014-10550.870 ppm
2017-08-109588-015-10202.90 ppm
2017-08-239590-002-12004.40 ppm
2017-09-069588-002-10302.90 ppm
2017-09-119590-016-13192.90 ppm
2017-10-099590-016-13083.00 ppm
2017-11-139590-002-10532.40 ppm
2017-11-139590-003-11071.70 ppm
2017-11-139590-004-12185.30 ppm
2017-11-139590-016-11522.10 ppm
2017-11-299588-002-09452.80 ppm
2017-11-299588-003-09401.70 ppm
2017-11-299588-004-10005.40 ppm
2017-11-299588-015-10153.20 ppm
2017-12-129590-016-11352.40 ppm