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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Cal-am Water Company - Duarte

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.793 ppm770.550 ppm - 1.20 ppm
2014N/A00N/A
2015N/A00N/A
20160.987 ppm770.710 ppm - 1.20 ppm
2017N/A00N/A

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
2013-09-129590-002-14400.740 ppm
2013-09-129590-003-13400.950 ppm
2013-09-129590-004-14150.620 ppm
2013-09-129590-007-13300.550 ppm
2013-09-129590-008-14250.740 ppm
2013-09-129590-009-13550.750 ppm
2013-09-129590-010-14501.20 ppm
2016-08-109590-007-10450.800 ppm
2016-08-109590-008-10301.20 ppm
2016-08-109590-010-10151.20 ppm
2016-08-109590-019-11250.710 ppm
2016-08-119590-002-11051.000 ppm
2016-08-119590-003-12051.10 ppm
2016-08-119590-009-11500.900 ppm