EWG's Tap Water Database



Cedar City Waterworks

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
20100.471 ppm770.200 ppm - 0.900 ppm
20110.450 ppm220.300 ppm - 0.600 ppm
20120.367 ppm330.300 ppm - 0.500 ppm
20130.500 ppm330.300 ppm - 0.700 ppm
20140.650 ppm220.600 ppm - 0.700 ppm
20150.500 ppm550.300 ppm - 0.900 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
2010-06-220.400 ppm
2010-06-220.200 ppm
2010-06-220.900 ppm
2010-06-220.500 ppm
2010-06-220.300 ppm
2010-08-120.500 ppm
2010-08-120.500 ppm
2011-02-230.600 ppm
2011-02-230.300 ppm
2012-03-200.300 ppm
2012-03-200.500 ppm
2012-03-200.300 ppm
2013-06-120.700 ppm
2013-06-120.300 ppm
2013-06-120.500 ppm
2014-06-170.600 ppm
2014-06-170.700 ppm
2015-06-100.300 ppm
2015-06-100.600 ppm
2015-06-100.400 ppm
2015-06-100.900 ppm
2015-06-100.300 ppm