EWG's Tap Water Database — 2019 UPDATE



City of Lancaster

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
20120.647 ppm220.411 ppm - 0.882 ppm
20130.456 ppm220.380 ppm - 0.532 ppm
20140.465 ppm220.316 ppm - 0.614 ppm
20150.592 ppm220.470 ppm - 0.714 ppm
20160.664 ppm220.536 ppm - 0.792 ppm
20170.621 ppm220.490 ppm - 0.751 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
2012-02-2112025870010.411 ppm
2012-02-2112025870020.882 ppm
2013-02-1213024160010.380 ppm
2013-07-30Q13045610050.532 ppm
2014-07-10Q14271720010.614 ppm
2014-07-10Q14271720020.316 ppm
2015-03-19Q15104650010.470 ppm
2015-08-18Q15326140010.714 ppm
2016-01-21Q16026990010.536 ppm
2016-01-21Q16026990020.792 ppm
2017-04-04Q17137780040.490 ppm
2017-04-04Q17137780010.751 ppm