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EWG's Tap Water Database

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Nitrate

Arapahoe Cnty Wwwa

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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.573 ppm75ND - 2.60 ppm
20110.251 ppm106ND - 1.40 ppm
20120.320 ppm98ND - 1.000 ppm
20130.586 ppm82ND - 3.90 ppm
20140.104 ppm94ND - 0.750 ppm
20150.250 ppm72ND - 1.50 ppm

ppm = parts per million.

State and national drinking water standards and health guidelines

Health Guideline 0.14 ppm

The health guideline of 0.14 ppm for nitrate was defined in a peer-reviewed scientific study by EWG and corresponds to one-in-one-million annual cancer risk level.

ppm = parts per million.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppm = parts per million.

EPA Maximum Contaminant
Level Goal (MCLG)10 ppm

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppm = parts per million.

All test results

Date Result
2010-01-25ND
2010-01-25ND
2010-01-251.10 ppm
2010-02-012.60 ppm
2010-02-010.0140 ppm
2010-04-050.110 ppm
2010-04-050.190 ppm
2011-01-11ND
2011-01-110.180 ppm
2011-01-110.0110 ppm
2011-01-111.40 ppm
2011-01-110.550 ppm
2011-01-11ND
2011-01-190.0170 ppm
2011-04-01ND
2011-04-01ND
2011-04-010.350 ppm
2012-01-130.01000 ppm
2012-01-130.890 ppm
2012-01-180.630 ppm
2012-01-230.0110 ppm
2012-01-231.000 ppm
2012-04-060.0160 ppm
2012-04-060.0440 ppm
2012-04-090.280 ppm
2012-04-09ND
2013-01-04ND
2013-01-08ND
2013-01-08ND
2013-01-080.790 ppm
2013-01-083.90 ppm
2013-04-16ND
2013-04-16ND
2013-04-16ND
2014-01-21ND
2014-01-210.750 ppm
2014-01-21ND
2014-01-21ND
2014-01-210.01000 ppm
2014-01-21ND
2014-01-210.110 ppm
2014-04-15ND
2014-12-100.0640 ppm
2015-08-051.50 ppm
2015-10-280.250 ppm
2015-10-28ND
2015-10-28ND
2015-10-28ND
2015-10-28ND
2015-11-30ND