Menu

EWG's Tap Water Database

Donate

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.

 

175

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.946 ppm2926ND - 1.70 ppm
20110.868 ppm2825ND - 1.95 ppm
20120.561 ppm3123ND - 2.16 ppm
20130.530 ppm30300.190 ppm - 1.32 ppm
20140.484 ppm2924ND - 1.60 ppm
20150.651 ppm2827ND - 2.30 ppm

ppm = parts per million.

State and national drinking water standards and health guidelines

Health Guideline 5 ppm

The health guideline of 5 ppm for nitrate and nitrite was defined by EWG based on studies by scientists at the National Cancer Institute and other independent researchers. This health guideline protects against cancer and harm to fetal growth and development.

ppm = parts per million.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppm = parts per million.

EPA Maximum Contaminant
Level Goal (MCLG)10 ppm

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppm = parts per million.

All test results

Date Lab ID Result
2010-01-1293002383070.770 ppm
2010-01-1393002383061.23 ppm
2010-02-08101839010.310 ppm
2010-02-1093002391041.06 ppm
2010-02-1093002391031.16 ppm
2010-03-1093002447501.24 ppm
2010-03-1093002447491.36 ppm
2010-04-1393002549361.50 ppm
2010-04-1493002549351.30 ppm
2010-05-1193002463551.70 ppm
2010-05-1293002463561.50 ppm
2010-06-07104726-010.380 ppm
2010-06-0893000775221.50 ppm
2010-06-0993000775211.50 ppm
2010-07-1393002734241.20 ppm
2010-07-139300204282ND
2010-07-1493002734231.30 ppm
2010-08-1093002803351.000 ppm
2010-08-109300280334ND
2010-08-1193002801361.30 ppm
2010-09-0793002814760.540 ppm
2010-09-079300281477ND
2010-09-0893002814751.35 ppm
2010-10-1293002390550.400 ppm
2010-10-1393002390541.20 ppm
2010-11-0993002557330.450 ppm
2010-11-1093002557320.960 ppm
2010-12-0793000116280.380 ppm
2010-12-0893000116270.840 ppm
2011-01-1193000283360.720 ppm
2011-01-1293000283351.25 ppm
2011-01-1711-10359-01A0.350 ppm
2011-02-0893000318580.740 ppm
2011-02-0993000318571.30 ppm
2011-03-0893000356441.15 ppm
2011-03-0993000356410.950 ppm
2011-04-1293000219181.35 ppm
2011-04-1393000219171.05 ppm
2011-05-1093000437171.35 ppm
2011-05-1193000507880.900 ppm
2011-06-0793000471301.50 ppm
2011-06-0893000471291.15 ppm
2011-06-1511-14240-01AND
2011-07-129300255734ND
2011-07-1393000640371.95 ppm
2011-07-1393000640381.35 ppm
2011-08-0993000764220.700 ppm
2011-08-099300076423ND
2011-08-1093000764210.260 ppm
2011-09-1393000803980.530 ppm
2011-09-1493000803971.35 ppm
2011-10-1293000887291.12 ppm
2011-10-1293000887300.320 ppm
2011-11-0893000944800.510 ppm
2011-11-0993000944790.840 ppm
2011-12-1393000945790.920 ppm
2011-12-1493000945780.700 ppm
2012-01-0912-10325-010.390 ppm
2012-01-1093001082091.18 ppm
2012-01-1193001082080.740 ppm
2012-02-0793001084581.42 ppm
2012-02-0893001084570.860 ppm
2012-03-1393001138851.15 ppm
2012-03-1493001213380.670 ppm
2012-04-109300005500ND
2012-04-1193000054990.660 ppm
2012-05-0993000112600.490 ppm
2012-05-099300013364ND
2012-05-3012-16037-03A0.700 ppm
2012-06-0512-16249-020.140 ppm
2012-06-129300080399ND
2012-06-1393000201830.780 ppm
2012-06-1393000343151.10 ppm
2012-07-109300020254ND
2012-07-1093000202550.850 ppm
2012-07-1193000357601.45 ppm
2012-08-079300028907ND
2012-08-0793000289080.270 ppm
2012-08-0893000289062.16 ppm
2012-09-119300044712ND
2012-09-119300044713ND
2012-09-1293000447110.560 ppm
2012-10-0993000444450.160 ppm
2012-10-1093000444440.380 ppm
2012-11-1393000344450.320 ppm
2012-11-1493000344440.510 ppm
2012-12-119300053277ND
2012-12-1293000532760.450 ppm
2013-01-0893000659900.610 ppm
2013-01-0813-10284-010.220 ppm
2013-01-0993000659890.460 ppm
2013-02-1293000559621.000 ppm
2013-02-1393000559610.480 ppm
2013-03-1293000489791.06 ppm
2013-03-1393000489780.480 ppm
2013-04-1093001005510.530 ppm
2013-04-1093001005521.20 ppm
2013-05-0793000601241.32 ppm
2013-05-0893000107980.400 ppm
2013-05-1413-15874-010.350 ppm
2013-06-1193000601250.220 ppm
2013-06-1193001006140.250 ppm
2013-06-1293000978920.380 ppm
2013-07-1093001161400.460 ppm
2013-07-1693001161411.000 ppm
2013-07-1693001161420.220 ppm
2013-08-13A1300036700.230 ppm
2013-08-13A1300036710.850 ppm
2013-08-14A1301084250.430 ppm
2013-09-10A1301334450.190 ppm
2013-09-10A1301334460.320 ppm
2013-09-11A1301334440.660 ppm
2013-10-08A1301410670.230 ppm
2013-10-09A1301410660.720 ppm
2013-11-12A1301479610.350 ppm
2013-11-13A1300107990.490 ppm
2013-12-10A1301582160.340 ppm
2013-12-11A1301582090.460 ppm
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