Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Nitrate and nitrite

East Lyme Water & Sewer Commission

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

 

250

Samples

0

Samples exceeding legal limit (MCL)

242

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.66 ppm12120.650 ppm - 3.46 ppm
2015N/A00N/A
20161.60 ppm990.780 ppm - 3.51 ppm
20171.68 ppm880.110 ppm - 3.91 ppm
20181.12 ppm74740.0300 ppm - 3.73 ppm
20190.995 ppm1471470.0200 ppm - 3.94 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
2014-11-1496187CH1.03 ppm
2014-11-1496188CH2.60 ppm
2014-11-1496189CH0.910 ppm
2014-11-1496190CH2.74 ppm
2014-11-1496191CH1.09 ppm
2014-11-1496192CH1.47 ppm
2014-12-1196601CH0.800 ppm
2014-12-1196602CH2.46 ppm
2014-12-1196603CH0.650 ppm
2014-12-1196604CH3.46 ppm
2014-12-1196605CH1.44 ppm
2014-12-1196606CH1.23 ppm
2016-02-10103491CH0.890 ppm
2016-02-10103492CH2.12 ppm
2016-02-10103493CH0.780 ppm
2016-02-10103494CH3.51 ppm
2016-02-10103495CH1.73 ppm
2016-02-10103496CH1.38 ppm
2016-08-02106406GE0.920 ppm
2016-08-02106407GE2.25 ppm
2016-08-02106408GE0.820 ppm
2017-01-19109314GE2.81 ppm
2017-01-19109315GE1.70 ppm
2017-05-09111179GE0.610 ppm
2017-05-09111180GE2.03 ppm
2017-05-09111181GE0.110 ppm
2017-09-14113547GE3.91 ppm
2017-09-14113548GE1.20 ppm
2017-09-14113549GE1.07 ppm
2018-02-12115996GE0.560 ppm
2018-02-12115997GE3.73 ppm
2018-02-12115998GE0.360 ppm
2018-02-12115999GE3.25 ppm
2018-02-12116000GE1.52 ppm
2018-02-12116001GE1.08 ppm
2018-09-13CB305320.800 ppm
2018-09-13CB305330.460 ppm
2018-09-13CB305340.0300 ppm
2018-09-13CB305351.60 ppm
2018-09-13CB305361.70 ppm
2018-09-13CB305370.340 ppm
2018-09-13CB305380.870 ppm
2018-09-13CB305391.39 ppm
2018-09-24CB372100.930 ppm
2018-09-24CB372110.440 ppm
2018-09-24CB372120.0800 ppm
2018-09-24CB372131.71 ppm
2018-09-24CB372141.78 ppm
2018-09-24CB372150.560 ppm
2018-09-24CB372160.320 ppm
2018-09-24CB372171.38 ppm
2018-09-24CB372183.46 ppm
2018-10-10CB689320.740 ppm
2018-10-10CB689330.430 ppm
2018-10-10CB689341.52 ppm
2018-10-10CB689351.65 ppm
2018-10-10CB689361.74 ppm
2018-10-10CB689370.280 ppm
2018-10-10CB689380.340 ppm
2018-10-10CB689391.24 ppm
2018-10-30CB846250.970 ppm
2018-10-30CB846260.510 ppm
2018-10-30CB846270.680 ppm
2018-10-30CB846280.600 ppm
2018-10-30CB846291.02 ppm
2018-10-30CB846300.450 ppm
2018-10-30CB846310.390 ppm
2018-10-30CB846323.34 ppm
2018-11-08CB907120.880 ppm
2018-11-08CB907130.430 ppm
2018-11-08CB907140.560 ppm
2018-11-08CB907150.410 ppm
2018-11-08CB907161.75 ppm
2018-11-08CB907170.310 ppm
2018-11-08CB907180.330 ppm
2018-11-08CB907193.02 ppm
2018-11-28CC039940.850 ppm
2018-11-28CC039950.410 ppm
2018-11-28CC039960.0900 ppm
2018-11-28CC039970.570 ppm
2018-11-28CC039981.26 ppm
2018-11-28CC039991.23 ppm
2018-11-28CC040000.330 ppm
2018-11-28CC040012.00 ppm
2018-11-28CC040023.03 ppm
2018-12-05CC076540.740 ppm
2018-12-05CC076550.400 ppm
2018-12-05CC076560.150 ppm
2018-12-05CC076571.64 ppm
2018-12-05CC076581.55 ppm
2018-12-05CC076590.740 ppm
2018-12-05CC076601.84 ppm
2018-12-05CC076610.700 ppm
2018-12-05CC076623.38 ppm
2018-12-181219001.04 ppm
2018-12-19CC170591.23 ppm
2018-12-19CC170600.370 ppm
2018-12-19CC170610.400 ppm
2018-12-19CC170621.59 ppm
2018-12-19CC170631.77 ppm
2018-12-19CC170641.28 ppm
2018-12-19CC170651.42 ppm
2018-12-19CC170660.840 ppm
2019-01-14CC282210.750 ppm
2019-01-14CC282220.530 ppm
2019-01-14CC282230.760 ppm
2019-01-14CC282240.700 ppm
2019-01-14CC282251.72 ppm
2019-01-14CC282261.000 ppm
2019-01-14CC282270.790 ppm
2019-01-14CC282281.47 ppm
2019-01-14CC282291.09 ppm
2019-01-24CC336800.910 ppm
2019-01-24CC336810.550 ppm
2019-01-24CC336820.850 ppm
2019-01-24CC336831.75 ppm
2019-01-24CC336841.77 ppm
2019-01-24CC336850.780 ppm
2019-01-24CC336861.55 ppm
2019-01-24CC336872.81 ppm
2019-02-14CC518020.930 ppm
2019-02-14CC518030.660 ppm
2019-02-14CC518040.780 ppm
2019-02-14CC518051.73 ppm
2019-02-14CC518061.67 ppm
2019-02-14CC518071.21 ppm
2019-02-14CC518080.700 ppm
2019-02-14CC518091.01 ppm
2019-02-14CC518102.24 ppm
2019-02-27CC585771.01 ppm
2019-02-27CC585780.720 ppm
2019-02-27CC585790.900 ppm
2019-02-27CC585801.58 ppm
2019-02-27CC585811.54 ppm
2019-02-27CC585820.360 ppm
2019-02-27CC585830.430 ppm
2019-02-27CC585843.33 ppm
2019-03-13CC668080.900 ppm
2019-03-13CC668090.650 ppm
2019-03-13CC668100.950 ppm
2019-03-13CC668110.770 ppm
2019-03-13CC668121.51 ppm
2019-03-13CC668130.450 ppm
2019-03-13CC668140.710 ppm
2019-03-13CC668153.31 ppm
2019-03-27CC758250.870 ppm
2019-03-27CC758260.670 ppm
2019-03-27CC758271.27 ppm
2019-03-27CC758280.670 ppm
2019-03-27CC758291.53 ppm
2019-03-27CC758300.470 ppm
2019-03-27CC758310.430 ppm
2019-03-27CC758320.400 ppm
2019-03-27CC758333.94 ppm
2019-04-08CC902950.950 ppm
2019-04-08CC902960.680 ppm
2019-04-08CC902971.03 ppm
2019-04-08CC902981.69 ppm
2019-04-08CC902991.70 ppm
2019-04-08CC903000.530 ppm
2019-04-08CC903010.480 ppm
2019-04-08CC903020.550 ppm
2019-04-08CC903032.90 ppm
2019-04-25CD013300.830 ppm
2019-04-25CD013310.560 ppm
2019-04-25CD013321.17 ppm
2019-04-25CD013331.000 ppm
2019-04-25CD013340.990 ppm
2019-04-25CD013350.500 ppm
2019-04-25CD013360.510 ppm
2019-04-25CD013371.47 ppm
2019-05-13CD114600.900 ppm
2019-05-13CD114610.500 ppm
2019-05-13CD114620.800 ppm
2019-05-13CD114630.510 ppm
2019-05-13CD114641.51 ppm
2019-05-13CD114650.510 ppm
2019-05-13CD114660.400 ppm
2019-05-13CD114671.07 ppm
2019-05-13CD114680.930 ppm
2019-05-30CD232500.890 ppm
2019-05-30CD232510.540 ppm
2019-05-30CD232520.840 ppm
2019-05-30CD232531.62 ppm
2019-05-30CD232541.20 ppm
2019-05-30CD232550.620 ppm
2019-05-30CD232560.400 ppm
2019-05-30CD232570.820 ppm
2019-05-30CD232581.64 ppm
2019-06-13CD337100.790 ppm
2019-06-13CD337110.530 ppm
2019-06-13CD337121.19 ppm
2019-06-13CD337131.57 ppm
2019-06-13CD337141.09 ppm
2019-06-13CD337150.400 ppm
2019-06-13CD337160.470 ppm
2019-06-13CD337170.980 ppm
2019-06-26CD423460.780 ppm
2019-06-26CD423470.450 ppm
2019-06-26CD423480.990 ppm
2019-06-26CD423491.62 ppm
2019-06-26CD423501.53 ppm
2019-06-26CD423510.460 ppm
2019-06-26CD423521.09 ppm
2019-07-11CD546820.940 ppm
2019-07-11CD546830.540 ppm
2019-07-11CD546840.0700 ppm
2019-07-11CD546851.08 ppm
2019-07-11CD546861.74 ppm
2019-07-11CD546870.420 ppm
2019-07-11CD546880.890 ppm
2019-07-24CD637510.860 ppm
2019-07-24CD637430.680 ppm
2019-07-24CD637440.420 ppm
2019-07-24CD637450.190 ppm
2019-07-24CD637461.75 ppm
2019-07-24CD637471.88 ppm
2019-07-24CD637480.630 ppm
2019-07-24CD637490.440 ppm
2019-08-07CD797470.830 ppm
2019-08-07CD797480.470 ppm
2019-08-07CD797490.0500 ppm
2019-08-07CD797501.74 ppm
2019-08-07CD797512.12 ppm
2019-08-07CD797520.760 ppm
2019-08-07CD797530.390 ppm
2019-08-07CD797540.500 ppm
2019-08-27CD928840.690 ppm
2019-08-27CD928850.400 ppm
2019-08-27CD928860.0200 ppm
2019-08-27CD928870.320 ppm
2019-08-27CD928881.03 ppm
2019-08-27CD928890.390 ppm
2019-08-27CD928900.920 ppm
2019-08-28CD937500.520 ppm
2019-08-28CD937510.870 ppm
2019-09-101273860.560 ppm
2019-09-101273872.44 ppm
2019-09-101273880.500 ppm
2019-09-11CE063760.760 ppm
2019-09-11CE063770.420 ppm
2019-09-11CE063780.0300 ppm
2019-09-11CE063790.440 ppm
2019-09-11CE063801.74 ppm
2019-09-11CE063810.460 ppm
2019-09-11CE063820.390 ppm
2019-09-11CE063841.06 ppm
2019-12-091292892.99 ppm
2019-12-091292901.09 ppm
2019-12-231295671.61 ppm