EWG's Tap Water Database — 2019 UPDATE



California Water Service Company - Hermosa / Redondo Beach

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.00316 ppm21ND - 0.00633 ppm
20130.207 ppm220.00497 ppm - 0.409 ppm
20140.178 ppm32ND - 0.530 ppm
20150.273 ppm220.00452 ppm - 0.542 ppm
20160.280 ppm21ND - 0.559 ppm
20170.457 ppm110.457 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
2012-06-115701-001-09350.00633 ppm
2013-06-185701-001-09550.409 ppm
2013-06-185701-005-09350.00497 ppm
2014-06-175701-001-13150.00339 ppm
2014-06-175701-005-09350.530 ppm
2015-06-105810-005-10150.542 ppm
2015-06-175701-001-10060.00452 ppm
2016-06-155701-005-10160.559 ppm
2017-06-205701-005-12400.457 ppm