EWG's Tap Water Database — 2019 UPDATE


Nitrate and nitrite

Greenville City PWS

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. 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
20121.49 ppm11110.180 ppm - 4.00 ppm
20132.02 ppm1210ND - 4.60 ppm
20141.72 ppm1211ND - 4.60 ppm
20152.19 ppm12120.430 ppm - 3.70 ppm
20161.54 ppm1211ND - 4.40 ppm
20171.67 ppm12120.1000 ppm - 4.70 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2012-01-0693000994253.70 ppm
2012-02-0393001082491.95 ppm
2012-04-0593001138681.42 ppm
2012-05-0393001194750.230 ppm
2012-06-0793000174821.90 ppm
2012-07-0693000209630.280 ppm
2012-08-0293000211210.180 ppm
2012-09-0693000249480.270 ppm
2012-10-0493000249494.00 ppm
2012-11-0193000351392.00 ppm
2012-12-0693000687650.490 ppm
2013-02-2193000564443.10 ppm
2013-03-0793000923534.60 ppm
2013-04-0493000957172.60 ppm
2013-05-0293001008153.70 ppm
2013-06-0693001079142.40 ppm
2013-07-0493001244054.60 ppm
2013-08-01A1301288740.540 ppm
2013-10-03A1301410630.450 ppm
2013-11-07A1301515051.50 ppm
2013-12-05A1301602910.800 ppm
2014-01-02A1401701882.80 ppm
2014-02-06A1401371361.90 ppm
2014-03-06A1401244141.80 ppm
2014-04-03A1401244184.60 ppm
2014-06-05A1401244281.56 ppm
2014-07-10A1401244313.20 ppm
2014-08-07A1401244330.470 ppm
2014-09-04A1401244371.45 ppm
2014-10-02A1401164450.500 ppm
2014-11-06A1401164430.260 ppm
2014-12-04A1400769882.10 ppm
2015-01-01A1502590723.00 ppm
2015-02-05A1502627472.50 ppm
2015-03-05A1502740930.430 ppm
2015-04-02A1502822093.70 ppm
2015-05-07A1502880843.45 ppm
2015-06-04A1502407683.65 ppm
2015-07-01A1503040122.18 ppm
2015-08-06A1501865492.00 ppm
2015-09-03A1503223350.750 ppm
2015-10-01A1501865500.700 ppm
2015-11-05A1500479901.05 ppm
2015-12-03A1502131062.90 ppm
2016-01-07A1602123401.86 ppm
2016-02-04A1603633041.04 ppm
2016-03-03A1603683640.310 ppm
2016-04-07A1603765334.40 ppm
2016-05-05A1603536013.95 ppm
2016-06-02A1603917091.42 ppm
2016-08-04A1603916670.500 ppm
2016-09-01A1604301211.48 ppm
2016-10-06A1604155080.160 ppm
2016-11-03A1601972930.990 ppm
2016-12-01A1603916772.40 ppm
2017-01-05A1704692460.350 ppm
2017-02-02A1703916813.40 ppm
2017-03-02A1704799991.30 ppm
2017-04-06A1704809712.12 ppm
2017-05-04A1703916840.1000 ppm
2017-06-01A1704808032.16 ppm
2017-07-06A1704696744.70 ppm
2017-08-03A1705086872.10 ppm
2017-09-07A1703916940.840 ppm
2017-10-05A1704242260.600 ppm
2017-11-02A1705268570.650 ppm
2017-12-07A1705396021.71 ppm