EWG's Tap Water Database — 2021 UPDATE



Somerset Water Service

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
20140.310 ppm440.220 ppm - 0.380 ppm
20150.325 ppm440.300 ppm - 0.400 ppm
20160.225 ppm43ND - 0.400 ppm
20170.300 ppm110.300 ppm
20180.300 ppm110.300 ppm
20190.300 ppm110.300 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
2014-02-10934701010.310 ppm
2014-05-12936352010.380 ppm
2014-09-08938586010.330 ppm
2014-12-09940468010.220 ppm
2015-03-13942219010.300 ppm
2015-06-08943939010.400 ppm
2015-09-08945752010.300 ppm
2015-12-08947567010.300 ppm
2016-03-14949501010.400 ppm
2016-09-12953639010.300 ppm
2016-12-12955607010.200 ppm
2017-03-13957580010.300 ppm
2018-03-13965529010.300 ppm
2019-06-18976172010.300 ppm