EWG's Tap Water Database — 2019 UPDATE



Brewster Water Department

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
20120.218 ppm440.140 ppm - 0.250 ppm
20130.328 ppm440.160 ppm - 0.560 ppm
20140.198 ppm53ND - 0.660 ppm
20150.276 ppm54ND - 0.540 ppm
20160.172 ppm54ND - 0.340 ppm
20170.294 ppm54ND - 0.640 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 Result
2012-03-280.250 ppm
2012-03-280.230 ppm
2012-03-280.140 ppm
2012-03-280.250 ppm
2013-03-130.290 ppm
2013-03-130.160 ppm
2013-03-130.300 ppm
2013-03-130.560 ppm
2014-03-110.660 ppm
2014-03-110.140 ppm
2014-03-110.190 ppm
2015-01-130.350 ppm
2015-01-130.180 ppm
2015-01-130.310 ppm
2015-01-130.540 ppm
2016-02-020.150 ppm
2016-02-020.340 ppm
2016-08-120.140 ppm
2016-08-120.230 ppm
2017-01-110.300 ppm
2017-01-110.640 ppm
2017-01-110.170 ppm
2017-01-110.360 ppm