EWG's Tap Water Database — 2019 UPDATE



Lake Cities Municipal Utility Authority

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
20120.320 ppm21ND - 0.640 ppm
20130.310 ppm220.160 ppm - 0.460 ppm
20140.192 ppm220.0455 ppm - 0.339 ppm
20150.397 ppm220.243 ppm - 0.550 ppm
20160.277 ppm220.169 ppm - 0.384 ppm
20170.361 ppm440.130 ppm - 0.583 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
2012-02-1512025010010.640 ppm
2013-02-0513021270010.460 ppm
2013-02-0513021270020.160 ppm
2014-06-19Q14224610070.0455 ppm
2014-09-18Q14459740010.339 ppm
2015-03-17Q15099130010.550 ppm
2015-06-09Q15212710010.243 ppm
2016-10-19Q16449150050.384 ppm
2016-10-19Q16449150060.169 ppm
2017-04-18Q17158780010.583 ppm
2017-09-07Q17421460010.308 ppm
2017-10-12Q17522500140.130 ppm
2017-10-12Q17522500120.424 ppm