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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Del-Co Water Company Inc.

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.

MORE ABOUT THIS CONTAMINANT

 

160

Samples

0

Samples exceeding legal limit (MCL)

138

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.484 ppm2924ND - 1.60 ppm
20150.651 ppm2827ND - 2.30 ppm
20160.659 ppm2926ND - 1.54 ppm
20171.06 ppm2827ND - 1.95 ppm
20180.743 ppm2517ND - 1.78 ppm
20190.947 ppm2119ND - 1.86 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
2014-01-07A1401584740.640 ppm
2014-01-0714-10165-01A0.250 ppm
2014-01-08A1401584750.500 ppm
2014-02-11A1401613880.720 ppm
2014-02-12A1400107970.940 ppm
2014-03-12A1401410680.650 ppm
2014-03-12A1401806880.500 ppm
2014-04-08A1401837910.420 ppm
2014-04-09A1401837900.200 ppm
2014-05-13A1400804001.15 ppm
2014-05-13A140194984ND
2014-05-14A1401613890.500 ppm
2014-06-10A140044446ND
2014-06-10A1401122821.25 ppm
2014-06-11A1401949850.350 ppm
2014-07-08A140209596ND
2014-07-08A1402095971.60 ppm
2014-07-09A1402095980.460 ppm
2014-08-12A140202071ND
2014-08-13A1402020650.400 ppm
2014-08-13A1402020701.08 ppm
2014-09-09A1401363930.460 ppm
2014-09-10A1401363920.190 ppm
2014-10-07A1402132300.350 ppm
2014-10-08A140116106ND
2014-11-11A1402429160.490 ppm
2014-11-12A1402429170.280 ppm
2014-12-09A1402429730.390 ppm
2014-12-10A1402429740.260 ppm
2015-01-0515-10020-010.280 ppm
2015-01-13A1502576680.260 ppm
2015-01-14A1502589770.170 ppm
2015-02-11A1502700480.390 ppm
2015-02-11A1502700490.470 ppm
2015-03-10A1502736830.510 ppm
2015-03-11A1502736820.400 ppm
2015-04-07A1502821320.930 ppm
2015-04-08A1502783330.350 ppm
2015-05-13A1502823571.22 ppm
2015-05-13A1502916350.250 ppm
2015-06-0815-17517-01A0.160 ppm
2015-06-09A1502942321.16 ppm
2015-06-10A1502942310.330 ppm
2015-07-07A1502017380.110 ppm
2015-07-07A1503037082.30 ppm
2015-07-15A1503037100.420 ppm
2015-08-11A150318584ND
2015-08-11A1503185851.90 ppm
2015-08-12A1502916360.380 ppm
2015-09-08A1502180031.35 ppm
2015-09-09A1502431170.450 ppm
2015-10-13A1503345320.750 ppm
2015-10-14A1503345310.500 ppm
2015-11-10A1502069550.960 ppm
2015-11-11A1503351690.840 ppm
2015-12-08A1503453710.750 ppm
2015-12-09A1503453700.650 ppm
2016-01-0416-10027-010.260 ppm
2016-01-13A1603453541.000 ppm
2016-01-13A1603455060.680 ppm
2016-02-09A1603578771.30 ppm
2016-02-11A1603685500.660 ppm
2016-03-09A1603535820.650 ppm
2016-03-09A1603685491.34 ppm
2016-04-12A160363839ND
2016-04-13A1603638380.700 ppm
2016-05-10A160381008ND
2016-05-11A1603810410.510 ppm
2016-06-07A1602390560.940 ppm
2016-06-07A1603998781.48 ppm
2016-06-08A1603998770.660 ppm
2016-07-1116-20466-010.520 ppm
2016-07-12A1604095921.54 ppm
2016-07-13A1604095910.730 ppm
2016-08-09A1604209781.32 ppm
2016-08-10A1604209770.860 ppm
2016-08-1516-23052-010.130 ppm
2016-09-1216-24982-01ND
2016-09-13A1600486100.330 ppm
2016-09-14A1600486080.680 ppm
2016-10-11A1604385900.530 ppm
2016-10-12A1604384470.490 ppm
2016-11-08A1603454210.520 ppm
2016-11-09A1602916370.420 ppm
2016-12-13A1604445890.530 ppm
2016-12-14A1604445900.320 ppm
2017-01-0317-10009-01A0.270 ppm
2017-01-10A1704629540.640 ppm
2017-01-11A1704629530.610 ppm
2017-02-07A1704694570.920 ppm
2017-02-08A1704694580.780 ppm
2017-03-07A1704712471.32 ppm
2017-03-08A1702916381.06 ppm
2017-04-11A1704808881.46 ppm
2017-04-12A1702916391.35 ppm
2017-05-09A1704906841.70 ppm
2017-05-10A1704906831.40 ppm
2017-06-13A1704974761.55 ppm
2017-06-14A1704974751.95 ppm
2017-06-1917-20888-01A0.650 ppm
2017-07-0317-21779-020.300 ppm
2017-07-11A1705039931.70 ppm
2017-07-12A1705039920.550 ppm
2017-08-0717-24619-01ND
2017-08-09A1705162010.890 ppm
2017-08-09A1704209791.80 ppm
2017-09-13A1705278851.28 ppm
2017-09-13A1705281691.16 ppm
2017-10-10A1705348570.850 ppm
2017-10-11A1705348561.21 ppm
2017-11-07A1705458450.870 ppm
2017-11-08A1705457351.27 ppm
2017-12-12A1705547501.04 ppm
2017-12-13A1705547491.04 ppm
2018-01-0218-10018-010.340 ppm
2018-01-10A1805606091.12 ppm
2018-01-10A1805606101.06 ppm
2018-02-13A1805608871.35 ppm
2018-02-14A1805608861.23 ppm
2018-03-13A1805779601.78 ppm
2018-03-14A1805779591.43 ppm
2018-04-10A1805827421.75 ppm
2018-04-11A1805827411.35 ppm
2018-05-09A1805747251.05 ppm
2018-05-09A180574726ND
2018-06-12A180597665ND
2018-06-13A1805976640.950 ppm
2018-07-10A1804095930.740 ppm
2018-07-11A1806089881.11 ppm
2018-08-07A1806199321.000 ppm
2018-08-08A1806200400.700 ppm
2018-09-11A180631042ND
2018-09-12A180629277ND
2018-10-09A180636185ND
2018-10-10A180642667ND
2018-11-148K01694-01ND
2018-11-148K01694-020.620 ppm
2018-12-118L01500-010.990 ppm
2018-12-128L01639-01ND
2019-01-0719-10395-010.290 ppm
2019-01-089A01229-011.20 ppm
2019-01-099A01225-01ND
2019-02-129B01407-011.54 ppm
2019-02-139B01405-010.560 ppm
2019-03-129C01588-011.68 ppm
2019-03-139C01590-010.520 ppm
2019-04-099D01461-011.59 ppm
2019-04-109D01471-010.530 ppm
2019-05-079E01162-011.71 ppm
2019-05-089E01163-010.660 ppm
2019-06-119F01715-011.72 ppm
2019-06-129F01716-010.540 ppm
2019-07-109G01463-01ND
2019-07-109G01458-011.86 ppm
2019-08-139H02093-011.39 ppm
2019-08-149H02095-010.680 ppm
2019-09-109I01587-011.20 ppm
2019-09-119I01588-010.700 ppm
2019-10-089J01416-010.920 ppm
2019-10-099J01419-010.590 ppm