Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Nitrate

Massachusetts Water Resources Authority (MWRA)

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.

 

433

Samples

0

Samples exceeding legal limit (MCL)

104

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0426 ppm87ND - 0.110 ppm
20130.0297 ppm87ND - 0.0770 ppm
20140.0228 ppm86ND - 0.0570 ppm
20150.165 ppm137135ND - 0.650 ppm
20160.126 ppm136134ND - 0.590 ppm
20170.163 ppm136133ND - 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
2012-01-090.110 ppm
2012-01-100.0190 ppm
2012-04-020.0140 ppm
2012-04-020.1000 ppm
2012-07-090.0580 ppm
2012-07-10ND
2012-10-010.0340 ppm
2012-10-020.00610 ppm
2013-01-070.0570 ppm
2013-01-080.0130 ppm
2013-04-010.0770 ppm
2013-04-020.01000 ppm
2013-07-09ND
2013-07-090.0610 ppm
2013-10-080.00520 ppm
2013-10-080.0140 ppm
2014-01-060.0570 ppm
2014-01-070.0110 ppm
2014-04-070.0130 ppm
2014-04-070.0470 ppm
2014-07-070.0460 ppm
2014-07-08ND
2014-10-060.00860 ppm
2014-10-07ND
2015-01-050.0380 ppm
2015-01-060.00700 ppm
2015-02-170.110 ppm
2015-02-170.490 ppm
2015-02-170.1000 ppm
2015-02-170.110 ppm
2015-02-170.1000 ppm
2015-02-170.0810 ppm
2015-02-170.210 ppm
2015-02-170.120 ppm
2015-02-170.140 ppm
2015-02-180.110 ppm
2015-02-180.130 ppm
2015-02-180.280 ppm
2015-02-180.120 ppm
2015-02-180.150 ppm
2015-02-180.110 ppm
2015-02-180.0870 ppm
2015-02-180.0890 ppm
2015-02-180.1000 ppm
2015-02-180.120 ppm
2015-02-180.0870 ppm
2015-02-190.110 ppm
2015-02-190.110 ppm
2015-02-190.0860 ppm
2015-02-190.0930 ppm
2015-02-190.110 ppm
2015-02-190.0840 ppm
2015-02-190.110 ppm
2015-02-190.0820 ppm
2015-02-190.1000 ppm
2015-02-190.120 ppm
2015-02-190.590 ppm
2015-02-190.110 ppm
2015-04-060.0810 ppm
2015-04-070.0120 ppm
2015-05-040.140 ppm
2015-05-180.430 ppm
2015-05-180.140 ppm
2015-05-180.110 ppm
2015-05-180.110 ppm
2015-05-180.180 ppm
2015-05-180.170 ppm
2015-05-190.150 ppm
2015-05-190.140 ppm
2015-05-190.300 ppm
2015-05-190.150 ppm
2015-05-190.130 ppm
2015-05-190.110 ppm
2015-05-190.120 ppm
2015-05-190.110 ppm
2015-05-190.140 ppm
2015-05-200.140 ppm
2015-05-200.130 ppm
2015-05-200.120 ppm
2015-05-200.120 ppm
2015-05-200.130 ppm
2015-05-200.120 ppm
2015-05-200.110 ppm
2015-05-200.140 ppm
2015-05-210.130 ppm
2015-05-210.140 ppm
2015-05-210.130 ppm
2015-05-210.120 ppm
2015-05-210.140 ppm
2015-05-210.140 ppm
2015-05-210.140 ppm
2015-05-210.130 ppm
2015-05-220.160 ppm
2015-07-07ND
2015-07-070.0510 ppm
2015-08-170.460 ppm
2015-08-170.580 ppm
2015-08-170.330 ppm
2015-08-170.270 ppm
2015-08-170.0550 ppm
2015-08-170.0630 ppm
2015-08-170.460 ppm
2015-08-170.0900 ppm
2015-08-170.650 ppm
2015-08-180.290 ppm
2015-08-180.630 ppm
2015-08-180.440 ppm
2015-08-180.180 ppm
2015-08-180.110 ppm
2015-08-180.0780 ppm
2015-08-180.0950 ppm
2015-08-190.250 ppm
2015-08-190.120 ppm
2015-08-190.0740 ppm
2015-08-190.0920 ppm
2015-08-190.140 ppm
2015-08-190.110 ppm
2015-08-190.0990 ppm
2015-08-190.1000 ppm
2015-08-200.1000 ppm
2015-08-200.0740 ppm
2015-08-200.140 ppm
2015-08-200.0830 ppm
2015-08-200.1000 ppm
2015-08-200.0810 ppm
2015-08-200.0940 ppm
2015-08-200.120 ppm
2015-10-06ND
2015-10-060.0130 ppm
2015-11-160.350 ppm
2015-11-160.620 ppm
2015-11-160.160 ppm
2015-11-160.160 ppm
2015-11-160.0740 ppm
2015-11-160.0670 ppm
2015-11-160.340 ppm
2015-11-160.0740 ppm
2015-11-160.250 ppm
2015-11-170.630 ppm
2015-11-170.600 ppm
2015-11-170.350 ppm
2015-11-170.280 ppm
2015-11-170.0880 ppm
2015-11-170.0720 ppm
2015-11-170.0690 ppm
2015-11-180.160 ppm
2015-11-180.180 ppm
2015-11-180.0730 ppm
2015-11-180.110 ppm
2015-11-180.0860 ppm
2015-11-180.0990 ppm
2015-11-180.1000 ppm
2015-11-180.110 ppm
2015-11-190.0870 ppm
2015-11-190.0740 ppm
2015-11-190.0930 ppm
2015-11-190.290 ppm
2015-11-190.0950 ppm
2015-11-190.0810 ppm
2015-11-190.1000 ppm
2015-11-190.490 ppm
2016-01-050.00560 ppm
2016-01-050.0430 ppm
2016-02-160.160 ppm
2016-02-160.540 ppm
2016-02-160.0910 ppm
2016-02-160.110 ppm
2016-02-160.0950 ppm
2016-02-160.0760 ppm
2016-02-160.120 ppm
2016-02-160.0840 ppm
2016-02-160.160 ppm
2016-02-170.0930 ppm
2016-02-170.190 ppm
2016-02-170.410 ppm
2016-02-170.120 ppm
2016-02-170.1000 ppm
2016-02-170.110 ppm
2016-02-170.0990 ppm
2016-02-170.0970 ppm
2016-02-170.0930 ppm
2016-02-170.0990 ppm
2016-02-170.0820 ppm
2016-02-180.0870 ppm
2016-02-180.0880 ppm
2016-02-180.0860 ppm
2016-02-180.0790 ppm
2016-02-180.0940 ppm
2016-02-180.0980 ppm
2016-02-180.0870 ppm
2016-02-180.0770 ppm
2016-02-180.0830 ppm
2016-02-180.0960 ppm
2016-02-180.160 ppm
2016-02-180.0910 ppm
2016-04-050.00660 ppm
2016-04-050.0420 ppm
2016-05-160.150 ppm
2016-05-160.410 ppm
2016-05-160.0760 ppm
2016-05-160.0860 ppm
2016-05-160.0560 ppm
2016-05-160.0550 ppm
2016-05-160.120 ppm
2016-05-160.0620 ppm
2016-05-160.140 ppm
2016-05-170.0840 ppm
2016-05-170.340 ppm
2016-05-170.0880 ppm
2016-05-170.0650 ppm
2016-05-170.0660 ppm
2016-05-170.0560 ppm
2016-05-170.0610 ppm
2016-05-180.0820 ppm
2016-05-180.0850 ppm
2016-05-180.0530 ppm
2016-05-180.0540 ppm
2016-05-180.0600 ppm
2016-05-180.0560 ppm
2016-05-180.0640 ppm
2016-05-180.0650 ppm
2016-05-190.0570 ppm
2016-05-190.0540 ppm
2016-05-190.0780 ppm
2016-05-190.0570 ppm
2016-05-190.0580 ppm
2016-05-190.0540 ppm
2016-05-190.0680 ppm
2016-05-190.0820 ppm
2016-07-05ND
2016-07-050.0120 ppm
2016-08-150.330 ppm
2016-08-150.590 ppm
2016-08-150.140 ppm
2016-08-150.0560 ppm
2016-08-150.0440 ppm
2016-08-150.0380 ppm
2016-08-150.370 ppm
2016-08-150.0450 ppm
2016-08-150.240 ppm
2016-08-160.300 ppm
2016-08-160.530 ppm
2016-08-160.260 ppm
2016-08-160.0750 ppm
2016-08-160.1000 ppm
2016-08-160.0320 ppm
2016-08-160.0440 ppm
2016-08-170.140 ppm
2016-08-170.0440 ppm
2016-08-170.0420 ppm
2016-08-170.0650 ppm
2016-08-170.0600 ppm
2016-08-170.0590 ppm
2016-08-170.0550 ppm
2016-08-170.0550 ppm
2016-08-170.0640 ppm
2016-08-180.0630 ppm
2016-08-180.0380 ppm
2016-08-180.0940 ppm
2016-08-180.210 ppm
2016-08-180.0750 ppm
2016-08-180.0330 ppm
2016-08-180.0640 ppm
2016-10-04ND
2016-10-040.0150 ppm
2016-11-140.330 ppm
2016-11-140.540 ppm
2016-11-140.150 ppm
2016-11-140.210 ppm
2016-11-140.0570 ppm
2016-11-140.0620 ppm
2016-11-140.280 ppm
2016-11-140.0720 ppm
2016-11-140.450 ppm
2016-11-150.370 ppm
2016-11-150.430 ppm
2016-11-150.330 ppm
2016-11-150.0980 ppm
2016-11-150.1000 ppm
2016-11-150.0650 ppm
2016-11-150.0860 ppm
2016-11-160.320 ppm
2016-11-160.0760 ppm
2016-11-160.0730 ppm
2016-11-160.110 ppm
2016-11-160.0760 ppm
2016-11-160.0950 ppm
2016-11-160.0700 ppm
2016-11-160.0820 ppm
2016-11-160.0740 ppm
2016-11-170.0790 ppm
2016-11-170.0690 ppm
2016-11-170.150 ppm
2016-11-170.200 ppm
2016-11-170.0990 ppm
2016-11-170.0640 ppm
2016-11-170.450 ppm
2017-01-030.00730 ppm
2017-01-030.0350 ppm
2017-02-130.140 ppm
2017-02-130.490 ppm
2017-02-130.0700 ppm
2017-02-130.0610 ppm
2017-02-130.0620 ppm
2017-02-130.0780 ppm
2017-02-130.190 ppm
2017-02-130.0760 ppm
2017-02-130.130 ppm
2017-02-140.0870 ppm
2017-02-140.130 ppm
2017-02-140.1000 ppm
2017-02-140.0810 ppm
2017-02-140.0810 ppm
2017-02-140.0710 ppm
2017-02-140.0640 ppm
2017-02-150.110 ppm
2017-02-150.0910 ppm
2017-02-150.0670 ppm
2017-02-150.0710 ppm
2017-02-150.0800 ppm
2017-02-150.0670 ppm
2017-02-150.0670 ppm
2017-02-150.0780 ppm
2017-02-160.0700 ppm
2017-02-160.0710 ppm
2017-02-160.0700 ppm
2017-02-160.0840 ppm
2017-02-160.0720 ppm
2017-02-160.0690 ppm
2017-02-160.0780 ppm
2017-02-160.170 ppm
2017-04-04ND
2017-04-040.0440 ppm
2017-05-150.160 ppm
2017-05-150.340 ppm
2017-05-150.120 ppm
2017-05-150.110 ppm
2017-05-150.110 ppm
2017-05-150.110 ppm
2017-05-150.200 ppm
2017-05-150.0970 ppm
2017-05-150.150 ppm
2017-05-160.120 ppm
2017-05-160.0910 ppm
2017-05-160.110 ppm
2017-05-160.110 ppm
2017-05-160.1000 ppm
2017-05-170.1000 ppm
2017-05-170.0800 ppm
2017-05-170.0980 ppm
2017-05-170.0770 ppm
2017-05-170.0780 ppm
2017-05-170.0840 ppm
2017-05-170.0770 ppm
2017-05-170.0850 ppm
2017-05-180.0940 ppm
2017-05-180.120 ppm
2017-05-180.110 ppm
2017-05-180.0810 ppm
2017-05-180.0790 ppm
2017-05-180.110 ppm
2017-05-180.110 ppm
2017-05-180.110 ppm
2017-05-180.1000 ppm
2017-05-180.1000 ppm
2017-07-11ND
2017-07-110.0520 ppm
2017-08-140.550 ppm
2017-08-140.640 ppm
2017-08-140.360 ppm
2017-08-140.290 ppm
2017-08-140.0730 ppm
2017-08-140.0880 ppm
2017-08-140.550 ppm
2017-08-140.1000 ppm
2017-08-140.640 ppm
2017-08-150.480 ppm
2017-08-150.130 ppm
2017-08-150.150 ppm
2017-08-150.0970 ppm
2017-08-150.0880 ppm
2017-08-160.340 ppm
2017-08-160.1000 ppm
2017-08-160.200 ppm
2017-08-160.490 ppm
2017-08-160.0740 ppm
2017-08-160.110 ppm
2017-08-160.150 ppm
2017-08-160.110 ppm
2017-08-160.0840 ppm
2017-08-160.450 ppm
2017-08-170.0900 ppm
2017-08-170.0760 ppm
2017-08-170.110 ppm
2017-08-170.490 ppm
2017-08-170.230 ppm
2017-08-170.0720 ppm
2017-08-170.140 ppm
2017-08-170.140 ppm
2017-10-03ND
2017-10-030.0440 ppm
2017-11-130.600 ppm
2017-11-130.220 ppm
2017-11-130.0950 ppm
2017-11-130.320 ppm
2017-11-130.0580 ppm
2017-11-130.0940 ppm
2017-11-130.280 ppm
2017-11-130.0840 ppm
2017-11-130.520 ppm
2017-11-140.460 ppm
2017-11-140.130 ppm
2017-11-140.0770 ppm
2017-11-140.0560 ppm
2017-11-140.0630 ppm
2017-11-150.490 ppm
2017-11-150.0790 ppm
2017-11-150.480 ppm
2017-11-150.530 ppm
2017-11-150.0560 ppm
2017-11-150.220 ppm
2017-11-150.310 ppm
2017-11-150.140 ppm
2017-11-150.0840 ppm
2017-11-150.450 ppm
2017-11-160.1000 ppm
2017-11-160.0690 ppm
2017-11-160.0740 ppm
2017-11-160.330 ppm
2017-11-160.240 ppm
2017-11-160.0770 ppm
2017-11-160.120 ppm
2017-11-160.550 ppm