EWG's Tap Water Database — 2021 UPDATE



Smiths Crossing Water Association

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
20140.684 ppm550.610 ppm - 0.900 ppm
20150.602 ppm550.490 ppm - 0.680 ppm
20160.500 ppm53ND - 0.950 ppm
20170.938 ppm550.740 ppm - 1.08 ppm
20181.17 ppm550.990 ppm - 1.30 ppm
20190.638 ppm54ND - 0.800 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
2014-05-14140515-019NI0.670 ppm
2014-05-14140515-018NI0.620 ppm
2014-05-14140515-017NI0.610 ppm
2014-05-14140515-016NI0.620 ppm
2014-05-14140515-008NI0.900 ppm
2015-05-13150514-039NI0.680 ppm
2015-05-13150514-038NI0.670 ppm
2015-05-13150514-037NI0.490 ppm
2015-05-13150514-036NI0.680 ppm
2015-05-13150514-035NI0.490 ppm
2016-05-24160525-024NI0.780 ppm
2016-05-24160525-023NI0.770 ppm
2016-05-24160525-015NI0.950 ppm
2017-03-28170329-053NI1.08 ppm
2017-03-28170329-052NI1.06 ppm
2017-03-28170329-051NI0.760 ppm
2017-03-28170329-049NI1.05 ppm
2017-03-28170329-046NI0.740 ppm
2018-04-03180404-017NI1.29 ppm
2018-04-03180404-016NI1.30 ppm
2018-04-03180404-015NI0.990 ppm
2018-04-03180404-014NI0.990 ppm
2018-04-03180404-013NI1.27 ppm
2019-04-09190410-011NI0.800 ppm
2019-04-09190410-014NI0.790 ppm
2019-04-09190410-013NI0.800 ppm
2019-04-09190410-012NI0.800 ppm