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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

Cal-am Water Company - Duarte

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.

 

91

Samples

0

Samples exceeding legal limit (MCL)

90

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.802 ppm880.565 ppm - 1.15 ppm
20130.832 ppm26260.533 ppm - 1.92 ppm
20140.826 ppm14140.585 ppm - 1.20 ppm
20150.877 ppm14140.680 ppm - 1.22 ppm
20161.02 ppm22220.670 ppm - 1.80 ppm
20171.08 ppm76ND - 1.60 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
2012-03-299588-008-12000.633 ppm
2012-09-189588-010-11451.15 ppm
2012-09-199588-004-12000.768 ppm
2012-12-049588-007-11550.565 ppm
2012-12-049588-009-12250.678 ppm
2012-12-049588-003-12150.881 ppm
2012-12-049588-002-13201.02 ppm
2012-12-049588-019-11150.723 ppm
2013-03-069588-008-11150.881 ppm
2013-09-109588-010-14201.15 ppm
2013-09-109588-004-12550.655 ppm
2013-09-129590-004-14150.610 ppm
2013-09-129590-002-14400.723 ppm
2013-09-129590-010-14501.15 ppm
2013-09-129590-007-13300.542 ppm
2013-09-129590-008-14250.723 ppm
2013-09-129590-009-13550.745 ppm
2013-09-129590-003-13400.949 ppm
2013-09-181225-003-10100.985 ppm
2013-09-181225-008-11050.725 ppm
2013-09-181225-007-09500.533 ppm
2013-09-181225-009-10250.752 ppm
2013-09-181225-004-10450.587 ppm
2013-09-181225-010-11501.04 ppm
2013-09-181225-002-11300.721 ppm
2013-09-181225-019-08500.547 ppm
2013-12-049588-004-11300.565 ppm
2013-12-049588-002-12100.858 ppm
2013-12-049588-007-10400.881 ppm
2013-12-049588-003-10551.92 ppm
2013-12-049588-008-11400.949 ppm
2013-12-049588-009-11050.700 ppm
2013-12-049588-010-12201.15 ppm
2013-12-049588-019-10000.587 ppm
2014-03-109588-008-12000.791 ppm
2014-06-231225-002-13000.736 ppm
2014-06-231225-003-11100.791 ppm
2014-06-231225-007-12400.605 ppm
2014-06-231225-008-12350.725 ppm
2014-06-231225-009-11350.782 ppm
2014-06-231225-010-13301.09 ppm
2014-06-231225-019-10050.585 ppm
2014-12-039588-003-10450.994 ppm
2014-12-039588-007-10300.791 ppm
2014-12-039588-002-11100.791 ppm
2014-12-039588-009-11000.768 ppm
2014-12-039588-010-10501.20 ppm
2014-12-039588-019-10200.926 ppm
2015-03-059588-008-10200.858 ppm
2015-09-281225-003-10500.930 ppm
2015-09-281225-007-12000.680 ppm
2015-09-281225-010-09451.22 ppm
2015-09-281225-008-13300.850 ppm
2015-09-281225-009-13450.810 ppm
2015-10-141225-002-12050.840 ppm
2015-10-141225-019-09450.680 ppm
2015-12-079588-002-11500.800 ppm
2015-12-079588-019-10400.910 ppm
2015-12-079588-003-11150.830 ppm
2015-12-079588-007-10550.810 ppm
2015-12-079588-010-12051.20 ppm
2015-12-079588-009-11300.860 ppm
2016-03-029588-008-10450.890 ppm
2016-06-201225-008-11450.960 ppm
2016-06-201225-019-11150.670 ppm
2016-06-201225-010-11351.27 ppm
2016-07-201225-009-10301.48 ppm
2016-07-201225-002-11100.900 ppm
2016-07-201225-003-10001.04 ppm
2016-07-201225-007-09300.800 ppm
2016-08-109590-019-11250.710 ppm
2016-08-109590-008-10301.20 ppm
2016-08-109590-010-10151.20 ppm
2016-08-109590-007-10450.800 ppm
2016-08-119590-009-11500.900 ppm
2016-08-119590-002-11051.000 ppm
2016-08-119590-003-12051.10 ppm
2016-09-079588-007-12450.800 ppm
2016-09-079588-010-13151.20 ppm
2016-09-079588-003-13051.80 ppm
2016-09-079588-009-14000.880 ppm
2016-09-079588-002-13301.000 ppm
2016-09-079588-008-13451.10 ppm
2016-09-079588-019-12300.680 ppm
2017-09-209588-007-1100ND
2017-09-209588-009-11151.000 ppm
2017-09-209588-010-12101.30 ppm
2017-09-209588-002-11501.60 ppm
2017-09-209588-019-10400.730 ppm
2017-09-209588-008-11251.50 ppm
2017-09-289588-003-09051.40 ppm